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Bug 1714684: Remove unused "mock" vendored library r=ahal 

Differential Revision: https://phabricator.services.mozilla.com/D117075
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26
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Copyright (c) 2003-2012, Michael Foord
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

2
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include LICENSE.txt tox.ini tests/*.py
recursive-include docs *.txt *.py *.png *.css *.html *.js

208
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Metadata-Version: 1.0
Name: mock
Version: 1.0.0
Summary: A Python Mocking and Patching Library for Testing
Home-page: http://www.voidspace.org.uk/python/mock/
Author: Michael Foord
Author-email: michael@voidspace.org.uk
License: UNKNOWN
Description: mock is a library for testing in Python. It allows you to replace parts of
your system under test with mock objects and make assertions about how they
have been used.
mock is now part of the Python standard library, available as `unittest.mock <
http://docs.python.org/py3k/library/unittest.mock.html#module-unittest.mock>`_
in Python 3.3 onwards.
mock provides a core `MagicMock` class removing the need to create a host of
stubs throughout your test suite. After performing an action, you can make
assertions about which methods / attributes were used and arguments they were
called with. You can also specify return values and set needed attributes in
the normal way.
mock is tested on Python versions 2.4-2.7 and Python 3. mock is also tested
with the latest versions of Jython and pypy.
The mock module also provides utility functions / objects to assist with
testing, particularly monkey patching.
* `PDF documentation for 1.0 beta 1
<http://www.voidspace.org.uk/downloads/mock-1.0.0.pdf>`_
* `mock on google code (repository and issue tracker)
<http://code.google.com/p/mock/>`_
* `mock documentation
<http://www.voidspace.org.uk/python/mock/>`_
* `mock on PyPI <http://pypi.python.org/pypi/mock/>`_
* `Mailing list (testing-in-python@lists.idyll.org)
<http://lists.idyll.org/listinfo/testing-in-python>`_
Mock is very easy to use and is designed for use with
`unittest <http://pypi.python.org/pypi/unittest2>`_. Mock is based on
the 'action -> assertion' pattern instead of 'record -> replay' used by many
mocking frameworks. See the `mock documentation`_ for full details.
Mock objects create all attributes and methods as you access them and store
details of how they have been used. You can configure them, to specify return
values or limit what attributes are available, and then make assertions about
how they have been used::
>>> from mock import Mock
>>> real = ProductionClass()
>>> real.method = Mock(return_value=3)
>>> real.method(3, 4, 5, key='value')
3
>>> real.method.assert_called_with(3, 4, 5, key='value')
`side_effect` allows you to perform side effects, return different values or
raise an exception when a mock is called::
>>> mock = Mock(side_effect=KeyError('foo'))
>>> mock()
Traceback (most recent call last):
...
KeyError: 'foo'
>>> values = {'a': 1, 'b': 2, 'c': 3}
>>> def side_effect(arg):
... return values[arg]
...
>>> mock.side_effect = side_effect
>>> mock('a'), mock('b'), mock('c')
(3, 2, 1)
>>> mock.side_effect = [5, 4, 3, 2, 1]
>>> mock(), mock(), mock()
(5, 4, 3)
Mock has many other ways you can configure it and control its behaviour. For
example the `spec` argument configures the mock to take its specification from
another object. Attempting to access attributes or methods on the mock that
don't exist on the spec will fail with an `AttributeError`.
The `patch` decorator / context manager makes it easy to mock classes or
objects in a module under test. The object you specify will be replaced with a
mock (or other object) during the test and restored when the test ends::
>>> from mock import patch
>>> @patch('test_module.ClassName1')
... @patch('test_module.ClassName2')
... def test(MockClass2, MockClass1):
... test_module.ClassName1()
... test_module.ClassName2()
... assert MockClass1.called
... assert MockClass2.called
...
>>> test()
.. note::
When you nest patch decorators the mocks are passed in to the decorated
function in the same order they applied (the normal *python* order that
decorators are applied). This means from the bottom up, so in the example
above the mock for `test_module.ClassName2` is passed in first.
With `patch` it matters that you patch objects in the namespace where they
are looked up. This is normally straightforward, but for a quick guide
read `where to patch
<http://www.voidspace.org.uk/python/mock/patch.html#where-to-patch>`_.
As well as a decorator `patch` can be used as a context manager in a with
statement::
>>> with patch.object(ProductionClass, 'method') as mock_method:
... mock_method.return_value = None
... real = ProductionClass()
... real.method(1, 2, 3)
...
>>> mock_method.assert_called_once_with(1, 2, 3)
There is also `patch.dict` for setting values in a dictionary just during the
scope of a test and restoring the dictionary to its original state when the
test ends::
>>> foo = {'key': 'value'}
>>> original = foo.copy()
>>> with patch.dict(foo, {'newkey': 'newvalue'}, clear=True):
... assert foo == {'newkey': 'newvalue'}
...
>>> assert foo == original
Mock supports the mocking of Python magic methods. The easiest way of
using magic methods is with the `MagicMock` class. It allows you to do
things like::
>>> from mock import MagicMock
>>> mock = MagicMock()
>>> mock.__str__.return_value = 'foobarbaz'
>>> str(mock)
'foobarbaz'
>>> mock.__str__.assert_called_once_with()
Mock allows you to assign functions (or other Mock instances) to magic methods
and they will be called appropriately. The MagicMock class is just a Mock
variant that has all of the magic methods pre-created for you (well - all the
useful ones anyway).
The following is an example of using magic methods with the ordinary Mock
class::
>>> from mock import Mock
>>> mock = Mock()
>>> mock.__str__ = Mock(return_value = 'wheeeeee')
>>> str(mock)
'wheeeeee'
For ensuring that the mock objects your tests use have the same api as the
objects they are replacing, you can use "auto-speccing". Auto-speccing can
be done through the `autospec` argument to patch, or the `create_autospec`
function. Auto-speccing creates mock objects that have the same attributes
and methods as the objects they are replacing, and any functions and methods
(including constructors) have the same call signature as the real object.
This ensures that your mocks will fail in the same way as your production
code if they are used incorrectly::
>>> from mock import create_autospec
>>> def function(a, b, c):
... pass
...
>>> mock_function = create_autospec(function, return_value='fishy')
>>> mock_function(1, 2, 3)
'fishy'
>>> mock_function.assert_called_once_with(1, 2, 3)
>>> mock_function('wrong arguments')
Traceback (most recent call last):
...
TypeError: <lambda>() takes exactly 3 arguments (1 given)
`create_autospec` can also be used on classes, where it copies the signature of
the `__init__` method, and on callable objects where it copies the signature of
the `__call__` method.
The distribution contains tests and documentation. The tests require
`unittest2 <http://pypi.python.org/pypi/unittest2>`_ to run.
Docs from the in-development version of `mock` can be found at
`mock.readthedocs.org <http://mock.readthedocs.org>`_.
Keywords: testing,test,mock,mocking,unittest,patching,stubs,fakes,doubles
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 2.4
Classifier: Programming Language :: Python :: 2.5
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3.1
Classifier: Programming Language :: Python :: 3.2
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Programming Language :: Python :: Implementation :: Jython
Classifier: Operating System :: OS Independent
Classifier: Topic :: Software Development :: Libraries
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Topic :: Software Development :: Testing

177
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mock is a library for testing in Python. It allows you to replace parts of
your system under test with mock objects and make assertions about how they
have been used.
mock is now part of the Python standard library, available as `unittest.mock <
http://docs.python.org/py3k/library/unittest.mock.html#module-unittest.mock>`_
in Python 3.3 onwards.
mock provides a core `MagicMock` class removing the need to create a host of
stubs throughout your test suite. After performing an action, you can make
assertions about which methods / attributes were used and arguments they were
called with. You can also specify return values and set needed attributes in
the normal way.
mock is tested on Python versions 2.4-2.7 and Python 3. mock is also tested
with the latest versions of Jython and pypy.
The mock module also provides utility functions / objects to assist with
testing, particularly monkey patching.
* `PDF documentation for 1.0 beta 1
<http://www.voidspace.org.uk/downloads/mock-1.0.0.pdf>`_
* `mock on google code (repository and issue tracker)
<http://code.google.com/p/mock/>`_
* `mock documentation
<http://www.voidspace.org.uk/python/mock/>`_
* `mock on PyPI <http://pypi.python.org/pypi/mock/>`_
* `Mailing list (testing-in-python@lists.idyll.org)
<http://lists.idyll.org/listinfo/testing-in-python>`_
Mock is very easy to use and is designed for use with
`unittest <http://pypi.python.org/pypi/unittest2>`_. Mock is based on
the 'action -> assertion' pattern instead of 'record -> replay' used by many
mocking frameworks. See the `mock documentation`_ for full details.
Mock objects create all attributes and methods as you access them and store
details of how they have been used. You can configure them, to specify return
values or limit what attributes are available, and then make assertions about
how they have been used::
>>> from mock import Mock
>>> real = ProductionClass()
>>> real.method = Mock(return_value=3)
>>> real.method(3, 4, 5, key='value')
3
>>> real.method.assert_called_with(3, 4, 5, key='value')
`side_effect` allows you to perform side effects, return different values or
raise an exception when a mock is called::
>>> mock = Mock(side_effect=KeyError('foo'))
>>> mock()
Traceback (most recent call last):
...
KeyError: 'foo'
>>> values = {'a': 1, 'b': 2, 'c': 3}
>>> def side_effect(arg):
... return values[arg]
...
>>> mock.side_effect = side_effect
>>> mock('a'), mock('b'), mock('c')
(3, 2, 1)
>>> mock.side_effect = [5, 4, 3, 2, 1]
>>> mock(), mock(), mock()
(5, 4, 3)
Mock has many other ways you can configure it and control its behaviour. For
example the `spec` argument configures the mock to take its specification from
another object. Attempting to access attributes or methods on the mock that
don't exist on the spec will fail with an `AttributeError`.
The `patch` decorator / context manager makes it easy to mock classes or
objects in a module under test. The object you specify will be replaced with a
mock (or other object) during the test and restored when the test ends::
>>> from mock import patch
>>> @patch('test_module.ClassName1')
... @patch('test_module.ClassName2')
... def test(MockClass2, MockClass1):
... test_module.ClassName1()
... test_module.ClassName2()
... assert MockClass1.called
... assert MockClass2.called
...
>>> test()
.. note::
When you nest patch decorators the mocks are passed in to the decorated
function in the same order they applied (the normal *python* order that
decorators are applied). This means from the bottom up, so in the example
above the mock for `test_module.ClassName2` is passed in first.
With `patch` it matters that you patch objects in the namespace where they
are looked up. This is normally straightforward, but for a quick guide
read `where to patch
<http://www.voidspace.org.uk/python/mock/patch.html#where-to-patch>`_.
As well as a decorator `patch` can be used as a context manager in a with
statement::
>>> with patch.object(ProductionClass, 'method') as mock_method:
... mock_method.return_value = None
... real = ProductionClass()
... real.method(1, 2, 3)
...
>>> mock_method.assert_called_once_with(1, 2, 3)
There is also `patch.dict` for setting values in a dictionary just during the
scope of a test and restoring the dictionary to its original state when the
test ends::
>>> foo = {'key': 'value'}
>>> original = foo.copy()
>>> with patch.dict(foo, {'newkey': 'newvalue'}, clear=True):
... assert foo == {'newkey': 'newvalue'}
...
>>> assert foo == original
Mock supports the mocking of Python magic methods. The easiest way of
using magic methods is with the `MagicMock` class. It allows you to do
things like::
>>> from mock import MagicMock
>>> mock = MagicMock()
>>> mock.__str__.return_value = 'foobarbaz'
>>> str(mock)
'foobarbaz'
>>> mock.__str__.assert_called_once_with()
Mock allows you to assign functions (or other Mock instances) to magic methods
and they will be called appropriately. The MagicMock class is just a Mock
variant that has all of the magic methods pre-created for you (well - all the
useful ones anyway).
The following is an example of using magic methods with the ordinary Mock
class::
>>> from mock import Mock
>>> mock = Mock()
>>> mock.__str__ = Mock(return_value = 'wheeeeee')
>>> str(mock)
'wheeeeee'
For ensuring that the mock objects your tests use have the same api as the
objects they are replacing, you can use "auto-speccing". Auto-speccing can
be done through the `autospec` argument to patch, or the `create_autospec`
function. Auto-speccing creates mock objects that have the same attributes
and methods as the objects they are replacing, and any functions and methods
(including constructors) have the same call signature as the real object.
This ensures that your mocks will fail in the same way as your production
code if they are used incorrectly::
>>> from mock import create_autospec
>>> def function(a, b, c):
... pass
...
>>> mock_function = create_autospec(function, return_value='fishy')
>>> mock_function(1, 2, 3)
'fishy'
>>> mock_function.assert_called_once_with(1, 2, 3)
>>> mock_function('wrong arguments')
Traceback (most recent call last):
...
TypeError: <lambda>() takes exactly 3 arguments (1 given)
`create_autospec` can also be used on classes, where it copies the signature of
the `__init__` method, and on callable objects where it copies the signature of
the `__call__` method.
The distribution contains tests and documentation. The tests require
`unittest2 <http://pypi.python.org/pypi/unittest2>`_ to run.
Docs from the in-development version of `mock` can be found at
`mock.readthedocs.org <http://mock.readthedocs.org>`_.

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.. currentmodule:: mock
CHANGELOG
=========
2012/10/07 Version 1.0.0
------------------------
No changes since 1.0.0 beta 1. This version has feature parity with
`unittest.mock
<http://docs.python.org/py3k/library/unittest.mock.html#module-unittest.mock>`_
in Python 3.3.
Full list of changes since 0.8:
* `mocksignature`, along with the `mocksignature` argument to `patch`, removed
* Support for deleting attributes (accessing deleted attributes will raise an
`AttributeError`)
* Added the `mock_open` helper function for mocking the builtin `open`
* `__class__` is assignable, so a mock can pass an `isinstance` check without
requiring a spec
* Addition of `PropertyMock`, for mocking properties
* `MagicMocks` made unorderable by default (in Python 3). The comparison
methods (other than equality and inequality) now return `NotImplemented`
* Propagate traceback info to support subclassing of `_patch` by other
libraries
* `create_autospec` works with attributes present in results of `dir` that
can't be fetched from the object's class. Contributed by Konstantine Rybnikov
* Any exceptions in an iterable `side_effect` will be raised instead of
returned
* In Python 3, `create_autospec` now supports keyword only arguments
* Added `patch.stopall` method to stop all active patches created by `start`
* BUGFIX: calling `MagicMock.reset_mock` wouldn't reset magic method mocks
* BUGFIX: calling `reset_mock` on a `MagicMock` created with autospec could
raise an exception
* BUGFIX: passing multiple spec arguments to patchers (`spec` , `spec_set` and
`autospec`) had unpredictable results, now it is an error
* BUGFIX: using `spec=True` *and* `create=True` as arguments to patchers could
result in using `DEFAULT` as the spec. Now it is an error instead
* BUGFIX: using `spec` or `autospec` arguments to patchers, along with
`spec_set=True` did not work correctly
* BUGFIX: using an object that evaluates to False as a spec could be ignored
* BUGFIX: a list as the `spec` argument to a patcher would always result in a
non-callable mock. Now if `__call__` is in the spec the mock is callable
2012/07/13 Version 1.0.0 beta 1
--------------------------------
* Added `patch.stopall` method to stop all active patches created by `start`
* BUGFIX: calling `MagicMock.reset_mock` wouldn't reset magic method mocks
* BUGFIX: calling `reset_mock` on a `MagicMock` created with autospec could
raise an exception
2012/05/04 Version 1.0.0 alpha 2
--------------------------------
* `PropertyMock` attributes are now standard `MagicMocks`
* `create_autospec` works with attributes present in results of `dir` that
can't be fetched from the object's class. Contributed by Konstantine Rybnikov
* Any exceptions in an iterable `side_effect` will be raised instead of
returned
* In Python 3, `create_autospec` now supports keyword only arguments
2012/03/25 Version 1.0.0 alpha 1
--------------------------------
The standard library version!
* `mocksignature`, along with the `mocksignature` argument to `patch`, removed
* Support for deleting attributes (accessing deleted attributes will raise an
`AttributeError`)
* Added the `mock_open` helper function for mocking the builtin `open`
* `__class__` is assignable, so a mock can pass an `isinstance` check without
requiring a spec
* Addition of `PropertyMock`, for mocking properties
* `MagicMocks` made unorderable by default (in Python 3). The comparison
methods (other than equality and inequality) now return `NotImplemented`
* Propagate traceback info to support subclassing of `_patch` by other
libraries
* BUGFIX: passing multiple spec arguments to patchers (`spec` , `spec_set` and
`autospec`) had unpredictable results, now it is an error
* BUGFIX: using `spec=True` *and* `create=True` as arguments to patchers could
result in using `DEFAULT` as the spec. Now it is an error instead
* BUGFIX: using `spec` or `autospec` arguments to patchers, along with
`spec_set=True` did not work correctly
* BUGFIX: using an object that evaluates to False as a spec could be ignored
* BUGFIX: a list as the `spec` argument to a patcher would always result in a
non-callable mock. Now if `__call__` is in the spec the mock is callable
2012/02/13 Version 0.8.0
------------------------
The only changes since 0.8rc2 are:
* Improved repr of :data:`sentinel` objects
* :data:`ANY` can be used for comparisons against :data:`call` objects
* The return value of `MagicMock.__iter__` method can be set to
any iterable and isn't required to be an iterator
Full List of changes since 0.7:
mock 0.8.0 is the last version that will support Python 2.4.
* Addition of :attr:`~Mock.mock_calls` list for *all* calls (including magic
methods and chained calls)
* :func:`patch` and :func:`patch.object` now create a :class:`MagicMock`
instead of a :class:`Mock` by default
* The patchers (`patch`, `patch.object` and `patch.dict`), plus `Mock` and
`MagicMock`, take arbitrary keyword arguments for configuration
* New mock method :meth:`~Mock.configure_mock` for setting attributes and
return values / side effects on the mock and its attributes
* New mock assert methods :meth:`~Mock.assert_any_call` and
:meth:`~Mock.assert_has_calls`
* Implemented :ref:`auto-speccing` (recursive, lazy speccing of mocks with
mocked signatures for functions/methods), as the `autospec` argument to
`patch`
* Added the :func:`create_autospec` function for manually creating
'auto-specced' mocks
* :func:`patch.multiple` for doing multiple patches in a single call, using
keyword arguments
* Setting :attr:`~Mock.side_effect` to an iterable will cause calls to the mock
to return the next value from the iterable
* New `new_callable` argument to `patch` and `patch.object` allowing you to
pass in a class or callable object (instead of `MagicMock`) that will be
called to replace the object being patched
* Addition of :class:`NonCallableMock` and :class:`NonCallableMagicMock`, mocks
without a `__call__` method
* Addition of :meth:`~Mock.mock_add_spec` method for adding (or changing) a
spec on an existing mock
* Protocol methods on :class:`MagicMock` are magic mocks, and are created
lazily on first lookup. This means the result of calling a protocol method is
a `MagicMock` instead of a `Mock` as it was previously
* Addition of :meth:`~Mock.attach_mock` method
* Added :data:`ANY` for ignoring arguments in :meth:`~Mock.assert_called_with`
calls
* Addition of :data:`call` helper object
* Improved repr for mocks
* Improved repr for :attr:`Mock.call_args` and entries in
:attr:`Mock.call_args_list`, :attr:`Mock.method_calls` and
:attr:`Mock.mock_calls`
* Improved repr for :data:`sentinel` objects
* `patch` lookup is done at use time not at decoration time
* In Python 2.6 or more recent, `dir` on a mock will report all the dynamically
created attributes (or the full list of attributes if there is a spec) as
well as all the mock methods and attributes.
* Module level :data:`FILTER_DIR` added to control whether `dir(mock)` filters
private attributes. `True` by default.
* `patch.TEST_PREFIX` for controlling how patchers recognise test methods when
used to decorate a class
* Support for using Java exceptions as a :attr:`~Mock.side_effect` on Jython
* `Mock` call lists (`call_args_list`, `method_calls` & `mock_calls`) are now
custom list objects that allow membership tests for "sub lists" and have
a nicer representation if you `str` or `print` them
* Mocks attached as attributes or return values to other mocks have calls
recorded in `method_calls` and `mock_calls` of the parent (unless a name is
already set on the child)
* Improved failure messages for `assert_called_with` and
`assert_called_once_with`
* The return value of the :class:`MagicMock` `__iter__` method can be set to
any iterable and isn't required to be an iterator
* Added the Mock API (`assert_called_with` etc) to functions created by
:func:`mocksignature`
* Tuples as well as lists can be used to specify allowed methods for `spec` &
`spec_set` arguments
* Calling `stop` on an unstarted patcher fails with a more meaningful error
message
* Renamed the internal classes `Sentinel` and `SentinelObject` to prevent abuse
* BUGFIX: an error creating a patch, with nested patch decorators, won't leave
patches in place
* BUGFIX: `__truediv__` and `__rtruediv__` not available as magic methods on
mocks in Python 3
* BUGFIX: `assert_called_with` / `assert_called_once_with` can be used with
`self` as a keyword argument
* BUGFIX: when patching a class with an explicit spec / spec_set (not a
boolean) it applies "spec inheritance" to the return value of the created
mock (the "instance")
* BUGFIX: remove the `__unittest` marker causing traceback truncation
* Removal of deprecated `patch_object`
* Private attributes `_name`, `_methods`, '_children', `_wraps` and `_parent`
(etc) renamed to reduce likelihood of clash with user attributes.
* Added license file to the distribution
2012/01/10 Version 0.8.0 release candidate 2
--------------------------------------------
* Removed the `configure` keyword argument to `create_autospec` and allow
arbitrary keyword arguments (for the `Mock` constructor) instead
* Fixed `ANY` equality with some types in `assert_called_with` calls
* Switched to a standard Sphinx theme (compatible with
`readthedocs.org <http://mock.readthedocs.org>`_)
2011/12/29 Version 0.8.0 release candidate 1
--------------------------------------------
* `create_autospec` on the return value of a mocked class will use `__call__`
for the signature rather than `__init__`
* Performance improvement instantiating `Mock` and `MagicMock`
* Mocks used as magic methods have the same type as their parent instead of
being hardcoded to `MagicMock`
Special thanks to Julian Berman for his help with diagnosing and improving
performance in this release.
2011/10/09 Version 0.8.0 beta 4
-------------------------------
* `patch` lookup is done at use time not at decoration time
* When attaching a Mock to another Mock as a magic method, calls are recorded
in mock_calls
* Addition of `attach_mock` method
* Renamed the internal classes `Sentinel` and `SentinelObject` to prevent abuse
* BUGFIX: various issues around circular references with mocks (setting a mock
return value to be itself etc)
2011/08/15 Version 0.8.0 beta 3
-------------------------------
* Mocks attached as attributes or return values to other mocks have calls
recorded in `method_calls` and `mock_calls` of the parent (unless a name is
already set on the child)
* Addition of `mock_add_spec` method for adding (or changing) a spec on an
existing mock
* Improved repr for `Mock.call_args` and entries in `Mock.call_args_list`,
`Mock.method_calls` and `Mock.mock_calls`
* Improved repr for mocks
* BUGFIX: minor fixes in the way `mock_calls` is worked out,
especially for "intermediate" mocks in a call chain
2011/08/05 Version 0.8.0 beta 2
-------------------------------
* Setting `side_effect` to an iterable will cause calls to the mock to return
the next value from the iterable
* Added `assert_any_call` method
* Moved `assert_has_calls` from call lists onto mocks
* BUGFIX: `call_args` and all members of `call_args_list` are two tuples of
`(args, kwargs)` again instead of three tuples of `(name, args, kwargs)`
2011/07/25 Version 0.8.0 beta 1
-------------------------------
* `patch.TEST_PREFIX` for controlling how patchers recognise test methods when
used to decorate a class
* `Mock` call lists (`call_args_list`, `method_calls` & `mock_calls`) are now
custom list objects that allow membership tests for "sub lists" and have
an `assert_has_calls` method for unordered call checks
* `callargs` changed to *always* be a three-tuple of `(name, args, kwargs)`
* Addition of `mock_calls` list for *all* calls (including magic methods and
chained calls)
* Extension of `call` object to support chained calls and `callargs` for better
comparisons with or without names. `call` object has a `call_list` method for
chained calls
* Added the public `instance` argument to `create_autospec`
* Support for using Java exceptions as a `side_effect` on Jython
* Improved failure messages for `assert_called_with` and
`assert_called_once_with`
* Tuples as well as lists can be used to specify allowed methods for `spec` &
`spec_set` arguments
* BUGFIX: Fixed bug in `patch.multiple` for argument passing when creating
mocks
* Added license file to the distribution
2011/07/16 Version 0.8.0 alpha 2
--------------------------------
* `patch.multiple` for doing multiple patches in a single call, using keyword
arguments
* New `new_callable` argument to `patch` and `patch.object` allowing you to
pass in a class or callable object (instead of `MagicMock`) that will be
called to replace the object being patched
* Addition of `NonCallableMock` and `NonCallableMagicMock`, mocks without a
`__call__` method
* Mocks created by `patch` have a `MagicMock` as the `return_value` where a
class is being patched
* `create_autospec` can create non-callable mocks for non-callable objects.
`return_value` mocks of classes will be non-callable unless the class has
a `__call__` method
* `autospec` creates a `MagicMock` without a spec for properties and slot
descriptors, because we don't know the type of object they return
* Removed the "inherit" argument from `create_autospec`
* Calling `stop` on an unstarted patcher fails with a more meaningful error
message
* BUGFIX: an error creating a patch, with nested patch decorators, won't leave
patches in place
* BUGFIX: `__truediv__` and `__rtruediv__` not available as magic methods on
mocks in Python 3
* BUGFIX: `assert_called_with` / `assert_called_once_with` can be used with
`self` as a keyword argument
* BUGFIX: autospec for functions / methods with an argument named self that
isn't the first argument no longer broken
* BUGFIX: when patching a class with an explicit spec / spec_set (not a
boolean) it applies "spec inheritance" to the return value of the created
mock (the "instance")
* BUGFIX: remove the `__unittest` marker causing traceback truncation
2011/06/14 Version 0.8.0 alpha 1
--------------------------------
mock 0.8.0 is the last version that will support Python 2.4.
* The patchers (`patch`, `patch.object` and `patch.dict`), plus `Mock` and
`MagicMock`, take arbitrary keyword arguments for configuration
* New mock method `configure_mock` for setting attributes and return values /
side effects on the mock and its attributes
* In Python 2.6 or more recent, `dir` on a mock will report all the dynamically
created attributes (or the full list of attributes if there is a spec) as
well as all the mock methods and attributes.
* Module level `FILTER_DIR` added to control whether `dir(mock)` filters
private attributes. `True` by default. Note that `vars(Mock())` can still be
used to get all instance attributes and `dir(type(Mock())` will still return
all the other attributes (irrespective of `FILTER_DIR`)
* `patch` and `patch.object` now create a `MagicMock` instead of a `Mock` by
default
* Added `ANY` for ignoring arguments in `assert_called_with` calls
* Addition of `call` helper object
* Protocol methods on `MagicMock` are magic mocks, and are created lazily on
first lookup. This means the result of calling a protocol method is a
MagicMock instead of a Mock as it was previously
* Added the Mock API (`assert_called_with` etc) to functions created by
`mocksignature`
* Private attributes `_name`, `_methods`, '_children', `_wraps` and `_parent`
(etc) renamed to reduce likelihood of clash with user attributes.
* Implemented auto-speccing (recursive, lazy speccing of mocks with mocked
signatures for functions/methods)
Limitations:
- Doesn't mock magic methods or attributes (it creates MagicMocks, so the
magic methods are *there*, they just don't have the signature mocked nor
are attributes followed)
- Doesn't mock function / method attributes
- Uses object traversal on the objects being mocked to determine types - so
properties etc may be triggered
- The return value of mocked classes (the 'instance') has the same call
signature as the class __init__ (as they share the same spec)
You create auto-specced mocks by passing `autospec=True` to `patch`.
Note that attributes that are None are special cased and mocked without a
spec (so any attribute / method can be used). This is because None is
typically used as a default value for attributes that may be of some other
type, and as we don't know what type that may be we allow all access.
Note that the `autospec` option to `patch` obsoletes the `mocksignature`
option.
* Added the `create_autospec` function for manually creating 'auto-specced'
mocks
* Removal of deprecated `patch_object`
2011/05/30 Version 0.7.2
------------------------
* BUGFIX: instances of list subclasses can now be used as mock specs
* BUGFIX: MagicMock equality / inequality protocol methods changed to use the
default equality / inequality. This is done through a `side_effect` on
the mocks used for `__eq__` / `__ne__`
2011/05/06 Version 0.7.1
------------------------
Package fixes contributed by Michael Fladischer. No code changes.
* Include template in package
* Use isolated binaries for the tox tests
* Unset executable bit on docs
* Fix DOS line endings in getting-started.txt
2011/03/05 Version 0.7.0
------------------------
No API changes since 0.7.0 rc1. Many documentation changes including a stylish
new `Sphinx theme <https://github.com/coordt/ADCtheme/>`_.
The full set of changes since 0.6.0 are:
* Python 3 compatibility
* Ability to mock magic methods with `Mock` and addition of `MagicMock`
with pre-created magic methods
* Addition of `mocksignature` and `mocksignature` argument to `patch` and
`patch.object`
* Addition of `patch.dict` for changing dictionaries during a test
* Ability to use `patch`, `patch.object` and `patch.dict` as class decorators
* Renamed ``patch_object`` to `patch.object` (``patch_object`` is
deprecated)
* Addition of soft comparisons: `call_args`, `call_args_list` and `method_calls`
now return tuple-like objects which compare equal even when empty args
or kwargs are skipped
* patchers (`patch`, `patch.object` and `patch.dict`) have start and stop
methods
* Addition of `assert_called_once_with` method
* Mocks can now be named (`name` argument to constructor) and the name is used
in the repr
* repr of a mock with a spec includes the class name of the spec
* `assert_called_with` works with `python -OO`
* New `spec_set` keyword argument to `Mock` and `patch`. If used,
attempting to *set* an attribute on a mock not on the spec will raise an
`AttributeError`
* Mocks created with a spec can now pass `isinstance` tests (`__class__`
returns the type of the spec)
* Added docstrings to all objects
* Improved failure message for `Mock.assert_called_with` when the mock
has not been called at all
* Decorated functions / methods have their docstring and `__module__`
preserved on Python 2.4.
* BUGFIX: `mock.patch` now works correctly with certain types of objects that
proxy attribute access, like the django settings object
* BUGFIX: mocks are now copyable (thanks to Ned Batchelder for reporting and
diagnosing this)
* BUGFIX: `spec=True` works with old style classes
* BUGFIX: ``help(mock)`` works now (on the module). Can no longer use ``__bases__``
as a valid sentinel name (thanks to Stephen Emslie for reporting and
diagnosing this)
* BUGFIX: ``side_effect`` now works with ``BaseException`` exceptions like
``KeyboardInterrupt``
* BUGFIX: `reset_mock` caused infinite recursion when a mock is set as its own
return value
* BUGFIX: patching the same object twice now restores the patches correctly
* with statement tests now skipped on Python 2.4
* Tests require unittest2 (or unittest2-py3k) to run
* Tested with `tox <http://pypi.python.org/pypi/tox>`_ on Python 2.4 - 3.2,
jython and pypy (excluding 3.0)
* Added 'build_sphinx' command to setup.py (requires setuptools or distribute)
Thanks to Florian Bauer
* Switched from subversion to mercurial for source code control
* `Konrad Delong <http://konryd.blogspot.com/>`_ added as co-maintainer
2011/02/16 Version 0.7.0 RC 1
-----------------------------
Changes since beta 4:
* Tested with jython, pypy and Python 3.2 and 3.1
* Decorated functions / methods have their docstring and `__module__`
preserved on Python 2.4
* BUGFIX: `mock.patch` now works correctly with certain types of objects that
proxy attribute access, like the django settings object
* BUGFIX: `reset_mock` caused infinite recursion when a mock is set as its own
return value
2010/11/12 Version 0.7.0 beta 4
-------------------------------
* patchers (`patch`, `patch.object` and `patch.dict`) have start and stop
methods
* Addition of `assert_called_once_with` method
* repr of a mock with a spec includes the class name of the spec
* `assert_called_with` works with `python -OO`
* New `spec_set` keyword argument to `Mock` and `patch`. If used,
attempting to *set* an attribute on a mock not on the spec will raise an
`AttributeError`
* Attributes and return value of a `MagicMock` are `MagicMock` objects
* Attempting to set an unsupported magic method now raises an `AttributeError`
* `patch.dict` works as a class decorator
* Switched from subversion to mercurial for source code control
* BUGFIX: mocks are now copyable (thanks to Ned Batchelder for reporting and
diagnosing this)
* BUGFIX: `spec=True` works with old style classes
* BUGFIX: `mocksignature=True` can now patch instance methods via
`patch.object`
2010/09/18 Version 0.7.0 beta 3
-------------------------------
* Using spec with :class:`MagicMock` only pre-creates magic methods in the spec
* Setting a magic method on a mock with a ``spec`` can only be done if the
spec has that method
* Mocks can now be named (`name` argument to constructor) and the name is used
in the repr
* `mocksignature` can now be used with classes (signature based on `__init__`)
and callable objects (signature based on `__call__`)
* Mocks created with a spec can now pass `isinstance` tests (`__class__`
returns the type of the spec)
* Default numeric value for MagicMock is 1 rather than zero (because the
MagicMock bool defaults to True and 0 is False)
* Improved failure message for :meth:`~Mock.assert_called_with` when the mock
has not been called at all
* Adding the following to the set of supported magic methods:
- ``__getformat__`` and ``__setformat__``
- pickle methods
- ``__trunc__``, ``__ceil__`` and ``__floor__``
- ``__sizeof__``
* Added 'build_sphinx' command to setup.py (requires setuptools or distribute)
Thanks to Florian Bauer
* with statement tests now skipped on Python 2.4
* Tests require unittest2 to run on Python 2.7
* Improved several docstrings and documentation
2010/06/23 Version 0.7.0 beta 2
-------------------------------
* :func:`patch.dict` works as a context manager as well as a decorator
* ``patch.dict`` takes a string to specify dictionary as well as a dictionary
object. If a string is supplied the name specified is imported
* BUGFIX: ``patch.dict`` restores dictionary even when an exception is raised
2010/06/22 Version 0.7.0 beta 1
-------------------------------
* Addition of :func:`mocksignature`
* Ability to mock magic methods
* Ability to use ``patch`` and ``patch.object`` as class decorators
* Renamed ``patch_object`` to :func:`patch.object` (``patch_object`` is
deprecated)
* Addition of :class:`MagicMock` class with all magic methods pre-created for you
* Python 3 compatibility (tested with 3.2 but should work with 3.0 & 3.1 as
well)
* Addition of :func:`patch.dict` for changing dictionaries during a test
* Addition of ``mocksignature`` argument to ``patch`` and ``patch.object``
* ``help(mock)`` works now (on the module). Can no longer use ``__bases__``
as a valid sentinel name (thanks to Stephen Emslie for reporting and
diagnosing this)
* Addition of soft comparisons: `call_args`, `call_args_list` and `method_calls`
now return tuple-like objects which compare equal even when empty args
or kwargs are skipped
* Added docstrings.
* BUGFIX: ``side_effect`` now works with ``BaseException`` exceptions like
``KeyboardInterrupt``
* BUGFIX: patching the same object twice now restores the patches correctly
* The tests now require `unittest2 <http://pypi.python.org/pypi/unittest2>`_
to run
* `Konrad Delong <http://konryd.blogspot.com/>`_ added as co-maintainer
2009/08/22 Version 0.6.0
------------------------
* New test layout compatible with test discovery
* Descriptors (static methods / class methods etc) can now be patched and
restored correctly
* Mocks can raise exceptions when called by setting ``side_effect`` to an
exception class or instance
* Mocks that wrap objects will not pass on calls to the underlying object if
an explicit return_value is set
2009/04/17 Version 0.5.0
------------------------
* Made DEFAULT part of the public api.
* Documentation built with Sphinx.
* ``side_effect`` is now called with the same arguments as the mock is called with and
if returns a non-DEFAULT value that is automatically set as the ``mock.return_value``.
* ``wraps`` keyword argument used for wrapping objects (and passing calls through to the wrapped object).
* ``Mock.reset`` renamed to ``Mock.reset_mock``, as reset is a common API name.
* ``patch`` / ``patch_object`` are now context managers and can be used with ``with``.
* A new 'create' keyword argument to patch and patch_object that allows them to patch
(and unpatch) attributes that don't exist. (Potentially unsafe to use - it can allow
you to have tests that pass when they are testing an API that doesn't exist - use at
your own risk!)
* The methods keyword argument to Mock has been removed and merged with spec. The spec
argument can now be a list of methods or an object to take the spec from.
* Nested patches may now be applied in a different order (created mocks passed
in the opposite order). This is actually a bugfix.
* patch and patch_object now take a spec keyword argument. If spec is
passed in as 'True' then the Mock created will take the object it is replacing
as its spec object. If the object being replaced is a class, then the return
value for the mock will also use the class as a spec.
* A Mock created without a spec will not attempt to mock any magic methods / attributes
(they will raise an ``AttributeError`` instead).
2008/10/12 Version 0.4.0
------------------------
* Default return value is now a new mock rather than None
* return_value added as a keyword argument to the constructor
* New method 'assert_called_with'
* Added 'side_effect' attribute / keyword argument called when mock is called
* patch decorator split into two decorators:
- ``patch_object`` which takes an object and an attribute name to patch
(plus optionally a value to patch with which defaults to a mock object)
- ``patch`` which takes a string specifying a target to patch; in the form
'package.module.Class.attribute'. (plus optionally a value to
patch with which defaults to a mock object)
* Can now patch objects with ``None``
* Change to patch for nose compatibility with error reporting in wrapped functions
* Reset no longer clears children / return value etc - it just resets
call count and call args. It also calls reset on all children (and
the return value if it is a mock).
Thanks to Konrad Delong, Kevin Dangoor and others for patches and suggestions.
2007/12/03 Version 0.3.1
-------------------------
``patch`` maintains the name of decorated functions for compatibility with nose
test autodiscovery.
Tests decorated with ``patch`` that use the two argument form (implicit mock
creation) will receive the mock(s) passed in as extra arguments.
Thanks to Kevin Dangoor for these changes.
2007/11/30 Version 0.3.0
-------------------------
Removed ``patch_module``. ``patch`` can now take a string as the first
argument for patching modules.
The third argument to ``patch`` is optional - a mock will be created by
default if it is not passed in.
2007/11/21 Version 0.2.1
-------------------------
Bug fix, allows reuse of functions decorated with ``patch`` and ``patch_module``.
2007/11/20 Version 0.2.0
-------------------------
Added ``spec`` keyword argument for creating ``Mock`` objects from a
specification object.
Added ``patch`` and ``patch_module`` monkey patching decorators.
Added ``sentinel`` for convenient access to unique objects.
Distribution includes unit tests.
2007/11/19 Version 0.1.0
-------------------------
Initial release.
TODO and Limitations
====================
Contributions, bug reports and comments welcomed!
Feature requests and bug reports are handled on the issue tracker:
* `mock issue tracker <http://code.google.com/p/mock/issues/list>`_
`wraps` is not integrated with magic methods.
`patch` could auto-do the patching in the constructor and unpatch in the
destructor. This would be useful in itself, but violates TOOWTDI and would be
unsafe for IronPython & PyPy (non-deterministic calling of destructors).
Destructors aren't called in CPython where there are cycles, but a weak
reference with a callback can be used to get round this.
`Mock` has several attributes. This makes it unsuitable for mocking objects
that use these attribute names. A way round this would be to provide methods
that *hide* these attributes when needed. In 0.8 many, but not all, of these
attributes are renamed to gain a `_mock` prefix, making it less likely that
they will clash. Any outstanding attributes that haven't been modified with
the prefix should be changed.
If a patch is started using `patch.start` and then not stopped correctly then
the unpatching is not done. Using weak references it would be possible to
detect and fix this when the patch object itself is garbage collected. This
would be tricky to get right though.
When a `Mock` is created by `patch`, arbitrary keywords can be used to set
attributes. If `patch` is created with a `spec`, and is replacing a class, then
a `return_value` mock is created. The keyword arguments are not applied to the
child mock, but could be.
When mocking a class with `patch`, passing in `spec=True` or `autospec=True`,
the mock class has an instance created from the same spec. Should this be the
default behaviour for mocks anyway (mock return values inheriting the spec
from their parent), or should it be controlled by an additional keyword
argument (`inherit`) to the Mock constructor? `create_autospec` does this, so
an additional keyword argument to Mock is probably unnecessary.
The `mocksignature` argument to `patch` with a non `Mock` passed into
`new_callable` will *probably* cause an error. Should it just be invalid?
Note that `NonCallableMock` and `NonCallableMagicMock` still have the unused
(and unusable) attributes: `return_value`, `side_effect`, `call_count`,
`call_args` and `call_args_list`. These could be removed or raise errors on
getting / setting. They also have the `assert_called_with` and
`assert_called_once_with` methods. Removing these would be pointless as
fetching them would create a mock (attribute) that could be called without
error.
Some outstanding technical debt. The way autospeccing mocks function
signatures was copied and modified from `mocksignature`. This could all be
refactored into one set of functions instead of two. The way we tell if
patchers are started and if a patcher is being used for a `patch.multiple`
call are both horrible. There are now a host of helper functions that should
be rationalised. (Probably time to split mock into a package instead of a
module.)
Passing arbitrary keyword arguments to `create_autospec`, or `patch` with
`autospec`, when mocking a *function* works fine. However, the arbitrary
attributes are set on the created mock - but `create_autospec` returns a
real function (which doesn't have those attributes). However, what is the use
case for using autospec to create functions with attributes that don't exist
on the original?
`mocksignature`, plus the `call_args_list` and `method_calls` attributes of
`Mock` could all be deprecated.

628
third_party/python/mock-1.0.0/docs/compare.txt поставляемый
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@ -1,628 +0,0 @@
=========================
Mock Library Comparison
=========================
.. testsetup::
def assertEqual(a, b):
assert a == b, ("%r != %r" % (a, b))
def assertRaises(Exc, func):
try:
func()
except Exc:
return
assert False, ("%s not raised" % Exc)
sys.modules['somemodule'] = somemodule = mock.Mock(name='somemodule')
class SomeException(Exception):
some_method = method1 = method2 = None
some_other_object = SomeObject = SomeException
A side-by-side comparison of how to accomplish some basic tasks with mock and
some other popular Python mocking libraries and frameworks.
These are:
* `flexmock <http://pypi.python.org/pypi/flexmock>`_
* `mox <http://pypi.python.org/pypi/mox>`_
* `Mocker <http://niemeyer.net/mocker>`_
* `dingus <http://pypi.python.org/pypi/dingus>`_
* `fudge <http://pypi.python.org/pypi/fudge>`_
Popular python mocking frameworks not yet represented here include
`MiniMock <http://pypi.python.org/pypi/MiniMock>`_.
`pMock <http://pmock.sourceforge.net/>`_ (last release 2004 and doesn't import
in recent versions of Python) and
`python-mock <http://python-mock.sourceforge.net/>`_ (last release 2005) are
intentionally omitted.
.. note::
A more up to date, and tested for all mock libraries (only the mock
examples on this page can be executed as doctests) version of this
comparison is maintained by Gary Bernhardt:
* `Python Mock Library Comparison
<http://garybernhardt.github.com/python-mock-comparison/>`_
This comparison is by no means complete, and also may not be fully idiomatic
for all the libraries represented. *Please* contribute corrections, missing
comparisons, or comparisons for additional libraries to the `mock issue
tracker <https://code.google.com/p/mock/issues/list>`_.
This comparison page was originally created by the `Mox project
<https://code.google.com/p/pymox/wiki/MoxComparison>`_ and then extended for
`flexmock and mock <http://has207.github.com/flexmock/compare.html>`_ by
Herman Sheremetyev. Dingus examples written by `Gary Bernhadt
<http://garybernhardt.github.com/python-mock-comparison/>`_. fudge examples
provided by `Kumar McMillan <http://farmdev.com/>`_.
.. note::
The examples tasks here were originally created by Mox which is a mocking
*framework* rather than a library like mock. The tasks shown naturally
exemplify tasks that frameworks are good at and not the ones they make
harder. In particular you can take a `Mock` or `MagicMock` object and use
it in any way you want with no up-front configuration. The same is also
true for Dingus.
The examples for mock here assume version 0.7.0.
Simple fake object
~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> my_mock.some_method.return_value = "calculated value"
>>> my_mock.some_attribute = "value"
>>> assertEqual("calculated value", my_mock.some_method())
>>> assertEqual("value", my_mock.some_attribute)
::
# Flexmock
mock = flexmock(some_method=lambda: "calculated value", some_attribute="value")
assertEqual("calculated value", mock.some_method())
assertEqual("value", mock.some_attribute)
# Mox
mock = mox.MockAnything()
mock.some_method().AndReturn("calculated value")
mock.some_attribute = "value"
mox.Replay(mock)
assertEqual("calculated value", mock.some_method())
assertEqual("value", mock.some_attribute)
# Mocker
mock = mocker.mock()
mock.some_method()
mocker.result("calculated value")
mocker.replay()
mock.some_attribute = "value"
assertEqual("calculated value", mock.some_method())
assertEqual("value", mock.some_attribute)
::
>>> # Dingus
>>> my_dingus = dingus.Dingus(some_attribute="value",
... some_method__returns="calculated value")
>>> assertEqual("calculated value", my_dingus.some_method())
>>> assertEqual("value", my_dingus.some_attribute)
::
>>> # fudge
>>> my_fake = (fudge.Fake()
... .provides('some_method')
... .returns("calculated value")
... .has_attr(some_attribute="value"))
...
>>> assertEqual("calculated value", my_fake.some_method())
>>> assertEqual("value", my_fake.some_attribute)
Simple mock
~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> my_mock.some_method.return_value = "value"
>>> assertEqual("value", my_mock.some_method())
>>> my_mock.some_method.assert_called_once_with()
::
# Flexmock
mock = flexmock()
mock.should_receive("some_method").and_return("value").once
assertEqual("value", mock.some_method())
# Mox
mock = mox.MockAnything()
mock.some_method().AndReturn("value")
mox.Replay(mock)
assertEqual("value", mock.some_method())
mox.Verify(mock)
# Mocker
mock = mocker.mock()
mock.some_method()
mocker.result("value")
mocker.replay()
assertEqual("value", mock.some_method())
mocker.verify()
::
>>> # Dingus
>>> my_dingus = dingus.Dingus(some_method__returns="value")
>>> assertEqual("value", my_dingus.some_method())
>>> assert my_dingus.some_method.calls().once()
::
>>> # fudge
>>> @fudge.test
... def test():
... my_fake = (fudge.Fake()
... .expects('some_method')
... .returns("value")
... .times_called(1))
...
>>> test()
Traceback (most recent call last):
...
AssertionError: fake:my_fake.some_method() was not called
Creating partial mocks
~~~~~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> SomeObject.some_method = mock.Mock(return_value='value')
>>> assertEqual("value", SomeObject.some_method())
::
# Flexmock
flexmock(SomeObject).should_receive("some_method").and_return('value')
assertEqual("value", mock.some_method())
# Mox
mock = mox.MockObject(SomeObject)
mock.some_method().AndReturn("value")
mox.Replay(mock)
assertEqual("value", mock.some_method())
mox.Verify(mock)
# Mocker
mock = mocker.mock(SomeObject)
mock.Get()
mocker.result("value")
mocker.replay()
assertEqual("value", mock.some_method())
mocker.verify()
::
>>> # Dingus
>>> object = SomeObject
>>> object.some_method = dingus.Dingus(return_value="value")
>>> assertEqual("value", object.some_method())
::
>>> # fudge
>>> fake = fudge.Fake().is_callable().returns("<fudge-value>")
>>> with fudge.patched_context(SomeObject, 'some_method', fake):
... s = SomeObject()
... assertEqual("<fudge-value>", s.some_method())
...
Ensure calls are made in specific order
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock(spec=SomeObject)
>>> my_mock.method1()
<Mock name='mock.method1()' id='...'>
>>> my_mock.method2()
<Mock name='mock.method2()' id='...'>
>>> assertEqual(my_mock.mock_calls, [call.method1(), call.method2()])
::
# Flexmock
mock = flexmock(SomeObject)
mock.should_receive('method1').once.ordered.and_return('first thing')
mock.should_receive('method2').once.ordered.and_return('second thing')
# Mox
mock = mox.MockObject(SomeObject)
mock.method1().AndReturn('first thing')
mock.method2().AndReturn('second thing')
mox.Replay(mock)
mox.Verify(mock)
# Mocker
mock = mocker.mock()
with mocker.order():
mock.method1()
mocker.result('first thing')
mock.method2()
mocker.result('second thing')
mocker.replay()
mocker.verify()
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> my_dingus.method1()
<Dingus ...>
>>> my_dingus.method2()
<Dingus ...>
>>> assertEqual(['method1', 'method2'], [call.name for call in my_dingus.calls])
::
>>> # fudge
>>> @fudge.test
... def test():
... my_fake = (fudge.Fake()
... .remember_order()
... .expects('method1')
... .expects('method2'))
... my_fake.method2()
... my_fake.method1()
...
>>> test()
Traceback (most recent call last):
...
AssertionError: Call #1 was fake:my_fake.method2(); Expected: #1 fake:my_fake.method1(), #2 fake:my_fake.method2(), end
Raising exceptions
~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> my_mock.some_method.side_effect = SomeException("message")
>>> assertRaises(SomeException, my_mock.some_method)
::
# Flexmock
mock = flexmock()
mock.should_receive("some_method").and_raise(SomeException("message"))
assertRaises(SomeException, mock.some_method)
# Mox
mock = mox.MockAnything()
mock.some_method().AndRaise(SomeException("message"))
mox.Replay(mock)
assertRaises(SomeException, mock.some_method)
mox.Verify(mock)
# Mocker
mock = mocker.mock()
mock.some_method()
mocker.throw(SomeException("message"))
mocker.replay()
assertRaises(SomeException, mock.some_method)
mocker.verify()
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> my_dingus.some_method = dingus.exception_raiser(SomeException)
>>> assertRaises(SomeException, my_dingus.some_method)
::
>>> # fudge
>>> my_fake = (fudge.Fake()
... .is_callable()
... .raises(SomeException("message")))
...
>>> my_fake()
Traceback (most recent call last):
...
SomeException: message
Override new instances of a class
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> with mock.patch('somemodule.Someclass') as MockClass:
... MockClass.return_value = some_other_object
... assertEqual(some_other_object, somemodule.Someclass())
...
::
# Flexmock
flexmock(some_module.SomeClass, new_instances=some_other_object)
assertEqual(some_other_object, some_module.SomeClass())
# Mox
# (you will probably have mox.Mox() available as self.mox in a real test)
mox.Mox().StubOutWithMock(some_module, 'SomeClass', use_mock_anything=True)
some_module.SomeClass().AndReturn(some_other_object)
mox.ReplayAll()
assertEqual(some_other_object, some_module.SomeClass())
# Mocker
instance = mocker.mock()
klass = mocker.replace(SomeClass, spec=None)
klass('expected', 'args')
mocker.result(instance)
::
>>> # Dingus
>>> MockClass = dingus.Dingus(return_value=some_other_object)
>>> with dingus.patch('somemodule.SomeClass', MockClass):
... assertEqual(some_other_object, somemodule.SomeClass())
...
::
>>> # fudge
>>> @fudge.patch('somemodule.SomeClass')
... def test(FakeClass):
... FakeClass.is_callable().returns(some_other_object)
... assertEqual(some_other_object, somemodule.SomeClass())
...
>>> test()
Call the same method multiple times
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. note::
You don't need to do *any* configuration to call `mock.Mock()` methods
multiple times. Attributes like `call_count`, `call_args_list` and
`method_calls` provide various different ways of making assertions about
how the mock was used.
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> my_mock.some_method()
<Mock name='mock.some_method()' id='...'>
>>> my_mock.some_method()
<Mock name='mock.some_method()' id='...'>
>>> assert my_mock.some_method.call_count >= 2
::
# Flexmock # (verifies that the method gets called at least twice)
flexmock(some_object).should_receive('some_method').at_least.twice
# Mox
# (does not support variable number of calls, so you need to create a new entry for each explicit call)
mock = mox.MockObject(some_object)
mock.some_method(mox.IgnoreArg(), mox.IgnoreArg())
mock.some_method(mox.IgnoreArg(), mox.IgnoreArg())
mox.Replay(mock)
mox.Verify(mock)
# Mocker
# (TODO)
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> my_dingus.some_method()
<Dingus ...>
>>> my_dingus.some_method()
<Dingus ...>
>>> assert len(my_dingus.calls('some_method')) == 2
::
>>> # fudge
>>> @fudge.test
... def test():
... my_fake = fudge.Fake().expects('some_method').times_called(2)
... my_fake.some_method()
...
>>> test()
Traceback (most recent call last):
...
AssertionError: fake:my_fake.some_method() was called 1 time(s). Expected 2.
Mock chained methods
~~~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> method3 = my_mock.method1.return_value.method2.return_value.method3
>>> method3.return_value = 'some value'
>>> assertEqual('some value', my_mock.method1().method2().method3(1, 2))
>>> method3.assert_called_once_with(1, 2)
::
# Flexmock
# (intermediate method calls are automatically assigned to temporary fake objects
# and can be called with any arguments)
flexmock(some_object).should_receive(
'method1.method2.method3'
).with_args(arg1, arg2).and_return('some value')
assertEqual('some_value', some_object.method1().method2().method3(arg1, arg2))
::
# Mox
mock = mox.MockObject(some_object)
mock2 = mox.MockAnything()
mock3 = mox.MockAnything()
mock.method1().AndReturn(mock1)
mock2.method2().AndReturn(mock2)
mock3.method3(arg1, arg2).AndReturn('some_value')
self.mox.ReplayAll()
assertEqual("some_value", some_object.method1().method2().method3(arg1, arg2))
self.mox.VerifyAll()
# Mocker
# (TODO)
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> method3 = my_dingus.method1.return_value.method2.return_value.method3
>>> method3.return_value = 'some value'
>>> assertEqual('some value', my_dingus.method1().method2().method3(1, 2))
>>> assert method3.calls('()', 1, 2).once()
::
>>> # fudge
>>> @fudge.test
... def test():
... my_fake = fudge.Fake()
... (my_fake
... .expects('method1')
... .returns_fake()
... .expects('method2')
... .returns_fake()
... .expects('method3')
... .with_args(1, 2)
... .returns('some value'))
... assertEqual('some value', my_fake.method1().method2().method3(1, 2))
...
>>> test()
Mocking a context manager
~~~~~~~~~~~~~~~~~~~~~~~~~
Examples for mock, Dingus and fudge only (so far):
.. doctest::
>>> # mock
>>> my_mock = mock.MagicMock()
>>> with my_mock:
... pass
...
>>> my_mock.__enter__.assert_called_with()
>>> my_mock.__exit__.assert_called_with(None, None, None)
::
>>> # Dingus (nothing special here; all dinguses are "magic mocks")
>>> my_dingus = dingus.Dingus()
>>> with my_dingus:
... pass
...
>>> assert my_dingus.__enter__.calls()
>>> assert my_dingus.__exit__.calls('()', None, None, None)
::
>>> # fudge
>>> my_fake = fudge.Fake().provides('__enter__').provides('__exit__')
>>> with my_fake:
... pass
...
Mocking the builtin open used as a context manager
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Example for mock only (so far):
.. doctest::
>>> # mock
>>> my_mock = mock.MagicMock()
>>> with mock.patch('__builtin__.open', my_mock):
... manager = my_mock.return_value.__enter__.return_value
... manager.read.return_value = 'some data'
... with open('foo') as h:
... data = h.read()
...
>>> data
'some data'
>>> my_mock.assert_called_once_with('foo')
*or*:
.. doctest::
>>> # mock
>>> with mock.patch('__builtin__.open') as my_mock:
... my_mock.return_value.__enter__ = lambda s: s
... my_mock.return_value.__exit__ = mock.Mock()
... my_mock.return_value.read.return_value = 'some data'
... with open('foo') as h:
... data = h.read()
...
>>> data
'some data'
>>> my_mock.assert_called_once_with('foo')
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> with dingus.patch('__builtin__.open', my_dingus):
... file_ = open.return_value.__enter__.return_value
... file_.read.return_value = 'some data'
... with open('foo') as h:
... data = f.read()
...
>>> data
'some data'
>>> assert my_dingus.calls('()', 'foo').once()
::
>>> # fudge
>>> from contextlib import contextmanager
>>> from StringIO import StringIO
>>> @contextmanager
... def fake_file(filename):
... yield StringIO('sekrets')
...
>>> with fudge.patch('__builtin__.open') as fake_open:
... fake_open.is_callable().calls(fake_file)
... with open('/etc/password') as f:
... data = f.read()
...
fake:__builtin__.open
>>> data
'sekrets'

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# -*- coding: utf-8 -*-
#
# Mock documentation build configuration file, created by
# sphinx-quickstart on Mon Nov 17 18:12:00 2008.
#
# This file is execfile()d with the current directory set to its containing dir.
#
# The contents of this file are pickled, so don't put values in the namespace
# that aren't pickleable (module imports are okay, they're removed automatically).
#
# All configuration values have a default value; values that are commented out
# serve to show the default value.
import sys, os
sys.path.insert(0, os.path.abspath('..'))
from mock import __version__
# If your extensions are in another directory, add it here. If the directory
# is relative to the documentation root, use os.path.abspath to make it
# absolute, like shown here.
#sys.path.append(os.path.abspath('some/directory'))
# General configuration
# ---------------------
# Add any Sphinx extension module names here, as strings. They can be extensions
# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
extensions = ['sphinx.ext.doctest']
doctest_global_setup = """
import os
import sys
import mock
from mock import * # yeah, I know :-/
import unittest2
import __main__
if os.getcwd() not in sys.path:
sys.path.append(os.getcwd())
# keep a reference to __main__
sys.modules['__main'] = __main__
class ProxyModule(object):
def __init__(self):
self.__dict__ = globals()
sys.modules['__main__'] = ProxyModule()
"""
doctest_global_cleanup = """
sys.modules['__main__'] = sys.modules['__main']
"""
html_theme = 'nature'
html_theme_options = {}
# Add any paths that contain templates here, relative to this directory.
#templates_path = ['_templates']
# The suffix of source filenames.
source_suffix = '.txt'
# The master toctree document.
master_doc = 'index'
# General substitutions.
project = u'Mock'
copyright = u'2007-2012, Michael Foord & the mock team'
# The default replacements for |version| and |release|, also used in various
# other places throughout the built documents.
#
# The short X.Y version.
version = __version__[:3]
# The full version, including alpha/beta/rc tags.
release = __version__
# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used:
#today = ''
# Else, today_fmt is used as the format for a strftime call.
today_fmt = '%B %d, %Y'
# List of documents that shouldn't be included in the build.
#unused_docs = []
# List of directories, relative to source directories, that shouldn't be searched
# for source files.
exclude_trees = []
# The reST default role (used for this markup: `text`) to use for all documents.
#default_role = None
# If true, '()' will be appended to :func: etc. cross-reference text.
#add_function_parentheses = True
# If true, the current module name will be prepended to all description
# unit titles (such as .. function::).
add_module_names = False
# If true, sectionauthor and moduleauthor directives will be shown in the
# output. They are ignored by default.
#show_authors = False
# The name of the Pygments (syntax highlighting) style to use.
pygments_style = 'friendly'
# Options for HTML output
# -----------------------
# The style sheet to use for HTML and HTML Help pages. A file of that name
# must exist either in Sphinx' static/ path, or in one of the custom paths
# given in html_static_path.
#html_style = 'adctheme.css'
# The name for this set of Sphinx documents. If None, it defaults to
# "<project> v<release> documentation".
#html_title = None
# A shorter title for the navigation bar. Default is the same as html_title.
#html_short_title = None
# The name of an image file (relative to this directory) to place at the top
# of the sidebar.
#html_logo = None
# The name of an image file (within the static path) to use as favicon of the
# docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32
# pixels large.
#html_favicon = None
# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
#html_static_path = ['_static']
# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
# using the given strftime format.
html_last_updated_fmt = '%b %d, %Y'
# If true, SmartyPants will be used to convert quotes and dashes to
# typographically correct entities.
#html_use_smartypants = True
# Custom sidebar templates, maps document names to template names.
#html_sidebars = {}
# Additional templates that should be rendered to pages, maps page names to
# template names.
#html_additional_pages = {}
# If false, no module index is generated.
html_use_modindex = False
# If false, no index is generated.
#html_use_index = True
# If true, the index is split into individual pages for each letter.
#html_split_index = False
# If true, the reST sources are included in the HTML build as _sources/<name>.
#html_copy_source = True
# If true, an OpenSearch description file will be output, and all pages will
# contain a <link> tag referring to it. The value of this option must be the
# base URL from which the finished HTML is served.
#html_use_opensearch = ''
# If nonempty, this is the file name suffix for HTML files (e.g. ".xhtml").
#html_file_suffix = ''
# Output file base name for HTML help builder.
htmlhelp_basename = 'Mockdoc'
# Options for LaTeX output
# ------------------------
# The paper size ('letter' or 'a4').
#latex_paper_size = 'letter'
# The font size ('10pt', '11pt' or '12pt').
latex_font_size = '12pt'
# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title, author, document class [howto/manual]).
latex_documents = [
('index', 'Mock.tex', u'Mock Documentation',
u'Michael Foord', 'manual'),
]
# The name of an image file (relative to this directory) to place at the top of
# the title page.
#latex_logo = None
# For "manual" documents, if this is true, then toplevel headings are parts,
# not chapters.
#latex_use_parts = False
# Additional stuff for the LaTeX preamble.
#latex_preamble = ''
# Documents to append as an appendix to all manuals.
#latex_appendices = []
# If false, no module index is generated.
latex_use_modindex = False

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===========================
Getting Started with Mock
===========================
.. _getting-started:
.. index:: Getting Started
.. testsetup::
class SomeClass(object):
static_method = None
class_method = None
attribute = None
sys.modules['package'] = package = Mock(name='package')
sys.modules['package.module'] = module = package.module
sys.modules['module'] = package.module
Using Mock
==========
Mock Patching Methods
---------------------
Common uses for :class:`Mock` objects include:
* Patching methods
* Recording method calls on objects
You might want to replace a method on an object to check that
it is called with the correct arguments by another part of the system:
.. doctest::
>>> real = SomeClass()
>>> real.method = MagicMock(name='method')
>>> real.method(3, 4, 5, key='value')
<MagicMock name='method()' id='...'>
Once our mock has been used (`real.method` in this example) it has methods
and attributes that allow you to make assertions about how it has been used.
.. note::
In most of these examples the :class:`Mock` and :class:`MagicMock` classes
are interchangeable. As the `MagicMock` is the more capable class it makes
a sensible one to use by default.
Once the mock has been called its :attr:`~Mock.called` attribute is set to
`True`. More importantly we can use the :meth:`~Mock.assert_called_with` or
:meth:`~Mock.assert_called_once_with` method to check that it was called with
the correct arguments.
This example tests that calling `ProductionClass().method` results in a call to
the `something` method:
.. doctest::
>>> from mock import MagicMock
>>> class ProductionClass(object):
... def method(self):
... self.something(1, 2, 3)
... def something(self, a, b, c):
... pass
...
>>> real = ProductionClass()
>>> real.something = MagicMock()
>>> real.method()
>>> real.something.assert_called_once_with(1, 2, 3)
Mock for Method Calls on an Object
----------------------------------
In the last example we patched a method directly on an object to check that it
was called correctly. Another common use case is to pass an object into a
method (or some part of the system under test) and then check that it is used
in the correct way.
The simple `ProductionClass` below has a `closer` method. If it is called with
an object then it calls `close` on it.
.. doctest::
>>> class ProductionClass(object):
... def closer(self, something):
... something.close()
...
So to test it we need to pass in an object with a `close` method and check
that it was called correctly.
.. doctest::
>>> real = ProductionClass()
>>> mock = Mock()
>>> real.closer(mock)
>>> mock.close.assert_called_with()
We don't have to do any work to provide the 'close' method on our mock.
Accessing close creates it. So, if 'close' hasn't already been called then
accessing it in the test will create it, but :meth:`~Mock.assert_called_with`
will raise a failure exception.
Mocking Classes
---------------
A common use case is to mock out classes instantiated by your code under test.
When you patch a class, then that class is replaced with a mock. Instances
are created by *calling the class*. This means you access the "mock instance"
by looking at the return value of the mocked class.
In the example below we have a function `some_function` that instantiates `Foo`
and calls a method on it. The call to `patch` replaces the class `Foo` with a
mock. The `Foo` instance is the result of calling the mock, so it is configured
by modifying the mock :attr:`~Mock.return_value`.
.. doctest::
>>> def some_function():
... instance = module.Foo()
... return instance.method()
...
>>> with patch('module.Foo') as mock:
... instance = mock.return_value
... instance.method.return_value = 'the result'
... result = some_function()
... assert result == 'the result'
Naming your mocks
-----------------
It can be useful to give your mocks a name. The name is shown in the repr of
the mock and can be helpful when the mock appears in test failure messages. The
name is also propagated to attributes or methods of the mock:
.. doctest::
>>> mock = MagicMock(name='foo')
>>> mock
<MagicMock name='foo' id='...'>
>>> mock.method
<MagicMock name='foo.method' id='...'>
Tracking all Calls
------------------
Often you want to track more than a single call to a method. The
:attr:`~Mock.mock_calls` attribute records all calls
to child attributes of the mock - and also to their children.
.. doctest::
>>> mock = MagicMock()
>>> mock.method()
<MagicMock name='mock.method()' id='...'>
>>> mock.attribute.method(10, x=53)
<MagicMock name='mock.attribute.method()' id='...'>
>>> mock.mock_calls
[call.method(), call.attribute.method(10, x=53)]
If you make an assertion about `mock_calls` and any unexpected methods
have been called, then the assertion will fail. This is useful because as well
as asserting that the calls you expected have been made, you are also checking
that they were made in the right order and with no additional calls:
You use the :data:`call` object to construct lists for comparing with
`mock_calls`:
.. doctest::
>>> expected = [call.method(), call.attribute.method(10, x=53)]
>>> mock.mock_calls == expected
True
Setting Return Values and Attributes
------------------------------------
Setting the return values on a mock object is trivially easy:
.. doctest::
>>> mock = Mock()
>>> mock.return_value = 3
>>> mock()
3
Of course you can do the same for methods on the mock:
.. doctest::
>>> mock = Mock()
>>> mock.method.return_value = 3
>>> mock.method()
3
The return value can also be set in the constructor:
.. doctest::
>>> mock = Mock(return_value=3)
>>> mock()
3
If you need an attribute setting on your mock, just do it:
.. doctest::
>>> mock = Mock()
>>> mock.x = 3
>>> mock.x
3
Sometimes you want to mock up a more complex situation, like for example
`mock.connection.cursor().execute("SELECT 1")`. If we wanted this call to
return a list, then we have to configure the result of the nested call.
We can use :data:`call` to construct the set of calls in a "chained call" like
this for easy assertion afterwards:
.. doctest::
>>> mock = Mock()
>>> cursor = mock.connection.cursor.return_value
>>> cursor.execute.return_value = ['foo']
>>> mock.connection.cursor().execute("SELECT 1")
['foo']
>>> expected = call.connection.cursor().execute("SELECT 1").call_list()
>>> mock.mock_calls
[call.connection.cursor(), call.connection.cursor().execute('SELECT 1')]
>>> mock.mock_calls == expected
True
It is the call to `.call_list()` that turns our call object into a list of
calls representing the chained calls.
Raising exceptions with mocks
-----------------------------
A useful attribute is :attr:`~Mock.side_effect`. If you set this to an
exception class or instance then the exception will be raised when the mock
is called.
.. doctest::
>>> mock = Mock(side_effect=Exception('Boom!'))
>>> mock()
Traceback (most recent call last):
...
Exception: Boom!
Side effect functions and iterables
-----------------------------------
`side_effect` can also be set to a function or an iterable. The use case for
`side_effect` as an iterable is where your mock is going to be called several
times, and you want each call to return a different value. When you set
`side_effect` to an iterable every call to the mock returns the next value
from the iterable:
.. doctest::
>>> mock = MagicMock(side_effect=[4, 5, 6])
>>> mock()
4
>>> mock()
5
>>> mock()
6
For more advanced use cases, like dynamically varying the return values
depending on what the mock is called with, `side_effect` can be a function.
The function will be called with the same arguments as the mock. Whatever the
function returns is what the call returns:
.. doctest::
>>> vals = {(1, 2): 1, (2, 3): 2}
>>> def side_effect(*args):
... return vals[args]
...
>>> mock = MagicMock(side_effect=side_effect)
>>> mock(1, 2)
1
>>> mock(2, 3)
2
Creating a Mock from an Existing Object
---------------------------------------
One problem with over use of mocking is that it couples your tests to the
implementation of your mocks rather than your real code. Suppose you have a
class that implements `some_method`. In a test for another class, you
provide a mock of this object that *also* provides `some_method`. If later
you refactor the first class, so that it no longer has `some_method` - then
your tests will continue to pass even though your code is now broken!
`Mock` allows you to provide an object as a specification for the mock,
using the `spec` keyword argument. Accessing methods / attributes on the
mock that don't exist on your specification object will immediately raise an
attribute error. If you change the implementation of your specification, then
tests that use that class will start failing immediately without you having to
instantiate the class in those tests.
.. doctest::
>>> mock = Mock(spec=SomeClass)
>>> mock.old_method()
Traceback (most recent call last):
...
AttributeError: object has no attribute 'old_method'
If you want a stronger form of specification that prevents the setting
of arbitrary attributes as well as the getting of them then you can use
`spec_set` instead of `spec`.
Patch Decorators
================
.. note::
With `patch` it matters that you patch objects in the namespace where they
are looked up. This is normally straightforward, but for a quick guide
read :ref:`where to patch <where-to-patch>`.
A common need in tests is to patch a class attribute or a module attribute,
for example patching a builtin or patching a class in a module to test that it
is instantiated. Modules and classes are effectively global, so patching on
them has to be undone after the test or the patch will persist into other
tests and cause hard to diagnose problems.
mock provides three convenient decorators for this: `patch`, `patch.object` and
`patch.dict`. `patch` takes a single string, of the form
`package.module.Class.attribute` to specify the attribute you are patching. It
also optionally takes a value that you want the attribute (or class or
whatever) to be replaced with. 'patch.object' takes an object and the name of
the attribute you would like patched, plus optionally the value to patch it
with.
`patch.object`:
.. doctest::
>>> original = SomeClass.attribute
>>> @patch.object(SomeClass, 'attribute', sentinel.attribute)
... def test():
... assert SomeClass.attribute == sentinel.attribute
...
>>> test()
>>> assert SomeClass.attribute == original
>>> @patch('package.module.attribute', sentinel.attribute)
... def test():
... from package.module import attribute
... assert attribute is sentinel.attribute
...
>>> test()
If you are patching a module (including `__builtin__`) then use `patch`
instead of `patch.object`:
.. doctest::
>>> mock = MagicMock(return_value = sentinel.file_handle)
>>> with patch('__builtin__.open', mock):
... handle = open('filename', 'r')
...
>>> mock.assert_called_with('filename', 'r')
>>> assert handle == sentinel.file_handle, "incorrect file handle returned"
The module name can be 'dotted', in the form `package.module` if needed:
.. doctest::
>>> @patch('package.module.ClassName.attribute', sentinel.attribute)
... def test():
... from package.module import ClassName
... assert ClassName.attribute == sentinel.attribute
...
>>> test()
A nice pattern is to actually decorate test methods themselves:
.. doctest::
>>> class MyTest(unittest2.TestCase):
... @patch.object(SomeClass, 'attribute', sentinel.attribute)
... def test_something(self):
... self.assertEqual(SomeClass.attribute, sentinel.attribute)
...
>>> original = SomeClass.attribute
>>> MyTest('test_something').test_something()
>>> assert SomeClass.attribute == original
If you want to patch with a Mock, you can use `patch` with only one argument
(or `patch.object` with two arguments). The mock will be created for you and
passed into the test function / method:
.. doctest::
>>> class MyTest(unittest2.TestCase):
... @patch.object(SomeClass, 'static_method')
... def test_something(self, mock_method):
... SomeClass.static_method()
... mock_method.assert_called_with()
...
>>> MyTest('test_something').test_something()
You can stack up multiple patch decorators using this pattern:
.. doctest::
>>> class MyTest(unittest2.TestCase):
... @patch('package.module.ClassName1')
... @patch('package.module.ClassName2')
... def test_something(self, MockClass2, MockClass1):
... self.assertTrue(package.module.ClassName1 is MockClass1)
... self.assertTrue(package.module.ClassName2 is MockClass2)
...
>>> MyTest('test_something').test_something()
When you nest patch decorators the mocks are passed in to the decorated
function in the same order they applied (the normal *python* order that
decorators are applied). This means from the bottom up, so in the example
above the mock for `test_module.ClassName2` is passed in first.
There is also :func:`patch.dict` for setting values in a dictionary just
during a scope and restoring the dictionary to its original state when the test
ends:
.. doctest::
>>> foo = {'key': 'value'}
>>> original = foo.copy()
>>> with patch.dict(foo, {'newkey': 'newvalue'}, clear=True):
... assert foo == {'newkey': 'newvalue'}
...
>>> assert foo == original
`patch`, `patch.object` and `patch.dict` can all be used as context managers.
Where you use `patch` to create a mock for you, you can get a reference to the
mock using the "as" form of the with statement:
.. doctest::
>>> class ProductionClass(object):
... def method(self):
... pass
...
>>> with patch.object(ProductionClass, 'method') as mock_method:
... mock_method.return_value = None
... real = ProductionClass()
... real.method(1, 2, 3)
...
>>> mock_method.assert_called_with(1, 2, 3)
As an alternative `patch`, `patch.object` and `patch.dict` can be used as
class decorators. When used in this way it is the same as applying the
decorator indvidually to every method whose name starts with "test".
For some more advanced examples, see the :ref:`further-examples` page.

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=========
Helpers
=========
.. currentmodule:: mock
.. testsetup::
mock.FILTER_DIR = True
from pprint import pprint as pp
original_dir = dir
def dir(obj):
print pp(original_dir(obj))
import urllib2
__main__.urllib2 = urllib2
.. testcleanup::
dir = original_dir
mock.FILTER_DIR = True
call
====
.. function:: call(*args, **kwargs)
`call` is a helper object for making simpler assertions, for comparing
with :attr:`~Mock.call_args`, :attr:`~Mock.call_args_list`,
:attr:`~Mock.mock_calls` and :attr: `~Mock.method_calls`. `call` can also be
used with :meth:`~Mock.assert_has_calls`.
.. doctest::
>>> m = MagicMock(return_value=None)
>>> m(1, 2, a='foo', b='bar')
>>> m()
>>> m.call_args_list == [call(1, 2, a='foo', b='bar'), call()]
True
.. method:: call.call_list()
For a call object that represents multiple calls, `call_list`
returns a list of all the intermediate calls as well as the
final call.
`call_list` is particularly useful for making assertions on "chained calls". A
chained call is multiple calls on a single line of code. This results in
multiple entries in :attr:`~Mock.mock_calls` on a mock. Manually constructing
the sequence of calls can be tedious.
:meth:`~call.call_list` can construct the sequence of calls from the same
chained call:
.. doctest::
>>> m = MagicMock()
>>> m(1).method(arg='foo').other('bar')(2.0)
<MagicMock name='mock().method().other()()' id='...'>
>>> kall = call(1).method(arg='foo').other('bar')(2.0)
>>> kall.call_list()
[call(1),
call().method(arg='foo'),
call().method().other('bar'),
call().method().other()(2.0)]
>>> m.mock_calls == kall.call_list()
True
.. _calls-as-tuples:
A `call` object is either a tuple of (positional args, keyword args) or
(name, positional args, keyword args) depending on how it was constructed. When
you construct them yourself this isn't particularly interesting, but the `call`
objects that are in the :attr:`Mock.call_args`, :attr:`Mock.call_args_list` and
:attr:`Mock.mock_calls` attributes can be introspected to get at the individual
arguments they contain.
The `call` objects in :attr:`Mock.call_args` and :attr:`Mock.call_args_list`
are two-tuples of (positional args, keyword args) whereas the `call` objects
in :attr:`Mock.mock_calls`, along with ones you construct yourself, are
three-tuples of (name, positional args, keyword args).
You can use their "tupleness" to pull out the individual arguments for more
complex introspection and assertions. The positional arguments are a tuple
(an empty tuple if there are no positional arguments) and the keyword
arguments are a dictionary:
.. doctest::
>>> m = MagicMock(return_value=None)
>>> m(1, 2, 3, arg='one', arg2='two')
>>> kall = m.call_args
>>> args, kwargs = kall
>>> args
(1, 2, 3)
>>> kwargs
{'arg2': 'two', 'arg': 'one'}
>>> args is kall[0]
True
>>> kwargs is kall[1]
True
>>> m = MagicMock()
>>> m.foo(4, 5, 6, arg='two', arg2='three')
<MagicMock name='mock.foo()' id='...'>
>>> kall = m.mock_calls[0]
>>> name, args, kwargs = kall
>>> name
'foo'
>>> args
(4, 5, 6)
>>> kwargs
{'arg2': 'three', 'arg': 'two'}
>>> name is m.mock_calls[0][0]
True
create_autospec
===============
.. function:: create_autospec(spec, spec_set=False, instance=False, **kwargs)
Create a mock object using another object as a spec. Attributes on the
mock will use the corresponding attribute on the `spec` object as their
spec.
Functions or methods being mocked will have their arguments checked to
ensure that they are called with the correct signature.
If `spec_set` is `True` then attempting to set attributes that don't exist
on the spec object will raise an `AttributeError`.
If a class is used as a spec then the return value of the mock (the
instance of the class) will have the same spec. You can use a class as the
spec for an instance object by passing `instance=True`. The returned mock
will only be callable if instances of the mock are callable.
`create_autospec` also takes arbitrary keyword arguments that are passed to
the constructor of the created mock.
See :ref:`auto-speccing` for examples of how to use auto-speccing with
`create_autospec` and the `autospec` argument to :func:`patch`.
ANY
===
.. data:: ANY
Sometimes you may need to make assertions about *some* of the arguments in a
call to mock, but either not care about some of the arguments or want to pull
them individually out of :attr:`~Mock.call_args` and make more complex
assertions on them.
To ignore certain arguments you can pass in objects that compare equal to
*everything*. Calls to :meth:`~Mock.assert_called_with` and
:meth:`~Mock.assert_called_once_with` will then succeed no matter what was
passed in.
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock('foo', bar=object())
>>> mock.assert_called_once_with('foo', bar=ANY)
`ANY` can also be used in comparisons with call lists like
:attr:`~Mock.mock_calls`:
.. doctest::
>>> m = MagicMock(return_value=None)
>>> m(1)
>>> m(1, 2)
>>> m(object())
>>> m.mock_calls == [call(1), call(1, 2), ANY]
True
FILTER_DIR
==========
.. data:: FILTER_DIR
`FILTER_DIR` is a module level variable that controls the way mock objects
respond to `dir` (only for Python 2.6 or more recent). The default is `True`,
which uses the filtering described below, to only show useful members. If you
dislike this filtering, or need to switch it off for diagnostic purposes, then
set `mock.FILTER_DIR = False`.
With filtering on, `dir(some_mock)` shows only useful attributes and will
include any dynamically created attributes that wouldn't normally be shown.
If the mock was created with a `spec` (or `autospec` of course) then all the
attributes from the original are shown, even if they haven't been accessed
yet:
.. doctest::
>>> dir(Mock())
['assert_any_call',
'assert_called_once_with',
'assert_called_with',
'assert_has_calls',
'attach_mock',
...
>>> import urllib2
>>> dir(Mock(spec=urllib2))
['AbstractBasicAuthHandler',
'AbstractDigestAuthHandler',
'AbstractHTTPHandler',
'BaseHandler',
...
Many of the not-very-useful (private to `Mock` rather than the thing being
mocked) underscore and double underscore prefixed attributes have been
filtered from the result of calling `dir` on a `Mock`. If you dislike this
behaviour you can switch it off by setting the module level switch
`FILTER_DIR`:
.. doctest::
>>> import mock
>>> mock.FILTER_DIR = False
>>> dir(mock.Mock())
['_NonCallableMock__get_return_value',
'_NonCallableMock__get_side_effect',
'_NonCallableMock__return_value_doc',
'_NonCallableMock__set_return_value',
'_NonCallableMock__set_side_effect',
'__call__',
'__class__',
...
Alternatively you can just use `vars(my_mock)` (instance members) and
`dir(type(my_mock))` (type members) to bypass the filtering irrespective of
`mock.FILTER_DIR`.
mock_open
=========
.. function:: mock_open(mock=None, read_data=None)
A helper function to create a mock to replace the use of `open`. It works
for `open` called directly or used as a context manager.
The `mock` argument is the mock object to configure. If `None` (the
default) then a `MagicMock` will be created for you, with the API limited
to methods or attributes available on standard file handles.
`read_data` is a string for the `read` method of the file handle to return.
This is an empty string by default.
Using `open` as a context manager is a great way to ensure your file handles
are closed properly and is becoming common::
with open('/some/path', 'w') as f:
f.write('something')
The issue is that even if you mock out the call to `open` it is the
*returned object* that is used as a context manager (and has `__enter__` and
`__exit__` called).
Mocking context managers with a :class:`MagicMock` is common enough and fiddly
enough that a helper function is useful.
.. doctest::
>>> from mock import mock_open
>>> m = mock_open()
>>> with patch('__main__.open', m, create=True):
... with open('foo', 'w') as h:
... h.write('some stuff')
...
>>> m.mock_calls
[call('foo', 'w'),
call().__enter__(),
call().write('some stuff'),
call().__exit__(None, None, None)]
>>> m.assert_called_once_with('foo', 'w')
>>> handle = m()
>>> handle.write.assert_called_once_with('some stuff')
And for reading files:
.. doctest::
>>> with patch('__main__.open', mock_open(read_data='bibble'), create=True) as m:
... with open('foo') as h:
... result = h.read()
...
>>> m.assert_called_once_with('foo')
>>> assert result == 'bibble'
.. _auto-speccing:
Autospeccing
============
Autospeccing is based on the existing `spec` feature of mock. It limits the
api of mocks to the api of an original object (the spec), but it is recursive
(implemented lazily) so that attributes of mocks only have the same api as
the attributes of the spec. In addition mocked functions / methods have the
same call signature as the original so they raise a `TypeError` if they are
called incorrectly.
Before I explain how auto-speccing works, here's why it is needed.
`Mock` is a very powerful and flexible object, but it suffers from two flaws
when used to mock out objects from a system under test. One of these flaws is
specific to the `Mock` api and the other is a more general problem with using
mock objects.
First the problem specific to `Mock`. `Mock` has two assert methods that are
extremely handy: :meth:`~Mock.assert_called_with` and
:meth:`~Mock.assert_called_once_with`.
.. doctest::
>>> mock = Mock(name='Thing', return_value=None)
>>> mock(1, 2, 3)
>>> mock.assert_called_once_with(1, 2, 3)
>>> mock(1, 2, 3)
>>> mock.assert_called_once_with(1, 2, 3)
Traceback (most recent call last):
...
AssertionError: Expected to be called once. Called 2 times.
Because mocks auto-create attributes on demand, and allow you to call them
with arbitrary arguments, if you misspell one of these assert methods then
your assertion is gone:
.. code-block:: pycon
>>> mock = Mock(name='Thing', return_value=None)
>>> mock(1, 2, 3)
>>> mock.assret_called_once_with(4, 5, 6)
Your tests can pass silently and incorrectly because of the typo.
The second issue is more general to mocking. If you refactor some of your
code, rename members and so on, any tests for code that is still using the
*old api* but uses mocks instead of the real objects will still pass. This
means your tests can all pass even though your code is broken.
Note that this is another reason why you need integration tests as well as
unit tests. Testing everything in isolation is all fine and dandy, but if you
don't test how your units are "wired together" there is still lots of room
for bugs that tests might have caught.
`mock` already provides a feature to help with this, called speccing. If you
use a class or instance as the `spec` for a mock then you can only access
attributes on the mock that exist on the real class:
.. doctest::
>>> import urllib2
>>> mock = Mock(spec=urllib2.Request)
>>> mock.assret_called_with
Traceback (most recent call last):
...
AttributeError: Mock object has no attribute 'assret_called_with'
The spec only applies to the mock itself, so we still have the same issue
with any methods on the mock:
.. code-block:: pycon
>>> mock.has_data()
<mock.Mock object at 0x...>
>>> mock.has_data.assret_called_with()
Auto-speccing solves this problem. You can either pass `autospec=True` to
`patch` / `patch.object` or use the `create_autospec` function to create a
mock with a spec. If you use the `autospec=True` argument to `patch` then the
object that is being replaced will be used as the spec object. Because the
speccing is done "lazily" (the spec is created as attributes on the mock are
accessed) you can use it with very complex or deeply nested objects (like
modules that import modules that import modules) without a big performance
hit.
Here's an example of it in use:
.. doctest::
>>> import urllib2
>>> patcher = patch('__main__.urllib2', autospec=True)
>>> mock_urllib2 = patcher.start()
>>> urllib2 is mock_urllib2
True
>>> urllib2.Request
<MagicMock name='urllib2.Request' spec='Request' id='...'>
You can see that `urllib2.Request` has a spec. `urllib2.Request` takes two
arguments in the constructor (one of which is `self`). Here's what happens if
we try to call it incorrectly:
.. doctest::
>>> req = urllib2.Request()
Traceback (most recent call last):
...
TypeError: <lambda>() takes at least 2 arguments (1 given)
The spec also applies to instantiated classes (i.e. the return value of
specced mocks):
.. doctest::
>>> req = urllib2.Request('foo')
>>> req
<NonCallableMagicMock name='urllib2.Request()' spec='Request' id='...'>
`Request` objects are not callable, so the return value of instantiating our
mocked out `urllib2.Request` is a non-callable mock. With the spec in place
any typos in our asserts will raise the correct error:
.. doctest::
>>> req.add_header('spam', 'eggs')
<MagicMock name='urllib2.Request().add_header()' id='...'>
>>> req.add_header.assret_called_with
Traceback (most recent call last):
...
AttributeError: Mock object has no attribute 'assret_called_with'
>>> req.add_header.assert_called_with('spam', 'eggs')
In many cases you will just be able to add `autospec=True` to your existing
`patch` calls and then be protected against bugs due to typos and api
changes.
As well as using `autospec` through `patch` there is a
:func:`create_autospec` for creating autospecced mocks directly:
.. doctest::
>>> import urllib2
>>> mock_urllib2 = create_autospec(urllib2)
>>> mock_urllib2.Request('foo', 'bar')
<NonCallableMagicMock name='mock.Request()' spec='Request' id='...'>
This isn't without caveats and limitations however, which is why it is not
the default behaviour. In order to know what attributes are available on the
spec object, autospec has to introspect (access attributes) the spec. As you
traverse attributes on the mock a corresponding traversal of the original
object is happening under the hood. If any of your specced objects have
properties or descriptors that can trigger code execution then you may not be
able to use autospec. On the other hand it is much better to design your
objects so that introspection is safe [#]_.
A more serious problem is that it is common for instance attributes to be
created in the `__init__` method and not to exist on the class at all.
`autospec` can't know about any dynamically created attributes and restricts
the api to visible attributes.
.. doctest::
>>> class Something(object):
... def __init__(self):
... self.a = 33
...
>>> with patch('__main__.Something', autospec=True):
... thing = Something()
... thing.a
...
Traceback (most recent call last):
...
AttributeError: Mock object has no attribute 'a'
There are a few different ways of resolving this problem. The easiest, but
not necessarily the least annoying, way is to simply set the required
attributes on the mock after creation. Just because `autospec` doesn't allow
you to fetch attributes that don't exist on the spec it doesn't prevent you
setting them:
.. doctest::
>>> with patch('__main__.Something', autospec=True):
... thing = Something()
... thing.a = 33
...
There is a more aggressive version of both `spec` and `autospec` that *does*
prevent you setting non-existent attributes. This is useful if you want to
ensure your code only *sets* valid attributes too, but obviously it prevents
this particular scenario:
.. doctest::
>>> with patch('__main__.Something', autospec=True, spec_set=True):
... thing = Something()
... thing.a = 33
...
Traceback (most recent call last):
...
AttributeError: Mock object has no attribute 'a'
Probably the best way of solving the problem is to add class attributes as
default values for instance members initialised in `__init__`. Note that if
you are only setting default attributes in `__init__` then providing them via
class attributes (shared between instances of course) is faster too. e.g.
.. code-block:: python
class Something(object):
a = 33
This brings up another issue. It is relatively common to provide a default
value of `None` for members that will later be an object of a different type.
`None` would be useless as a spec because it wouldn't let you access *any*
attributes or methods on it. As `None` is *never* going to be useful as a
spec, and probably indicates a member that will normally of some other type,
`autospec` doesn't use a spec for members that are set to `None`. These will
just be ordinary mocks (well - `MagicMocks`):
.. doctest::
>>> class Something(object):
... member = None
...
>>> mock = create_autospec(Something)
>>> mock.member.foo.bar.baz()
<MagicMock name='mock.member.foo.bar.baz()' id='...'>
If modifying your production classes to add defaults isn't to your liking
then there are more options. One of these is simply to use an instance as the
spec rather than the class. The other is to create a subclass of the
production class and add the defaults to the subclass without affecting the
production class. Both of these require you to use an alternative object as
the spec. Thankfully `patch` supports this - you can simply pass the
alternative object as the `autospec` argument:
.. doctest::
>>> class Something(object):
... def __init__(self):
... self.a = 33
...
>>> class SomethingForTest(Something):
... a = 33
...
>>> p = patch('__main__.Something', autospec=SomethingForTest)
>>> mock = p.start()
>>> mock.a
<NonCallableMagicMock name='Something.a' spec='int' id='...'>
.. note::
An additional limitation (currently) with `autospec` is that unbound
methods on mocked classes *don't* take an "explicit self" as the first
argument - so this usage will fail with `autospec`.
.. doctest::
>>> class Foo(object):
... def foo(self):
... pass
...
>>> Foo.foo(Foo())
>>> MockFoo = create_autospec(Foo)
>>> MockFoo.foo(MockFoo())
Traceback (most recent call last):
...
TypeError: <lambda>() takes exactly 1 argument (2 given)
The reason is that its very hard to tell the difference between functions,
unbound methods and staticmethods across Python 2 & 3 and the alternative
implementations. This restriction may be fixed in future versions.
------
.. [#] This only applies to classes or already instantiated objects. Calling
a mocked class to create a mock instance *does not* create a real instance.
It is only attribute lookups - along with calls to `dir` - that are done. A
way round this problem would have been to use `getattr_static
<http://docs.python.org/dev/library/inspect.html#inspect.getattr_static>`_,
which can fetch attributes without triggering code execution. Descriptors
like `classmethod` and `staticmethod` *need* to be fetched correctly though,
so that their signatures can be mocked correctly.

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====================================
Mock - Mocking and Testing Library
====================================
.. currentmodule:: mock
:Author: `Michael Foord
<http://www.voidspace.org.uk/python/weblog/index.shtml>`_
:Version: |release|
:Date: 2012/10/07
:Homepage: `Mock Homepage`_
:Download: `Mock on PyPI`_
:Documentation: `PDF Documentation
<http://www.voidspace.org.uk/downloads/mock-1.0.0.pdf>`_
:License: `BSD License`_
:Support: `Mailing list (testing-in-python@lists.idyll.org)
<http://lists.idyll.org/listinfo/testing-in-python>`_
:Issue tracker: `Google code project
<http://code.google.com/p/mock/issues/list>`_
.. _Mock Homepage: http://www.voidspace.org.uk/python/mock/
.. _BSD License: http://www.voidspace.org.uk/python/license.shtml
.. currentmodule:: mock
.. module:: mock
:synopsis: Mock object and testing library.
.. index:: introduction
mock is a library for testing in Python. It allows you to replace parts of
your system under test with mock objects and make assertions about how they
have been used.
mock is now part of the Python standard library, available as `unittest.mock
<http://docs.python.org/py3k/library/unittest.mock.html#module-unittest.mock>`_
in Python 3.3 onwards.
mock provides a core :class:`Mock` class removing the need to create a host
of stubs throughout your test suite. After performing an action, you can make
assertions about which methods / attributes were used and arguments they were
called with. You can also specify return values and set needed attributes in
the normal way.
Additionally, mock provides a :func:`patch` decorator that handles patching
module and class level attributes within the scope of a test, along with
:const:`sentinel` for creating unique objects. See the `quick guide`_ for
some examples of how to use :class:`Mock`, :class:`MagicMock` and
:func:`patch`.
Mock is very easy to use and is designed for use with
`unittest <http://pypi.python.org/pypi/unittest2>`_. Mock is based on
the 'action -> assertion' pattern instead of `'record -> replay'` used by many
mocking frameworks.
mock is tested on Python versions 2.4-2.7, Python 3 plus the latest versions of
Jython and PyPy.
.. testsetup::
class ProductionClass(object):
def method(self, *args):
pass
module = sys.modules['module'] = ProductionClass
ProductionClass.ClassName1 = ProductionClass
ProductionClass.ClassName2 = ProductionClass
API Documentation
=================
.. toctree::
:maxdepth: 2
mock
patch
helpers
sentinel
magicmock
User Guide
==========
.. toctree::
:maxdepth: 2
getting-started
examples
compare
changelog
.. index:: installing
Installing
==========
The current version is |release|. Mock is stable and widely used. If you do
find any bugs, or have suggestions for improvements / extensions
then please contact us.
* `mock on PyPI <http://pypi.python.org/pypi/mock>`_
* `mock documentation as PDF
<http://www.voidspace.org.uk/downloads/mock-1.0.0.pdf>`_
* `Google Code Home & Mercurial Repository <http://code.google.com/p/mock/>`_
.. index:: repository
.. index:: hg
You can checkout the latest development version from the Google Code Mercurial
repository with the following command:
``hg clone https://mock.googlecode.com/hg/ mock``
.. index:: pip
.. index:: easy_install
.. index:: setuptools
If you have pip, setuptools or distribute you can install mock with:
| ``easy_install -U mock``
| ``pip install -U mock``
Alternatively you can download the mock distribution from PyPI and after
unpacking run:
``python setup.py install``
Quick Guide
===========
:class:`Mock` and :class:`MagicMock` objects create all attributes and
methods as you access them and store details of how they have been used. You
can configure them, to specify return values or limit what attributes are
available, and then make assertions about how they have been used:
.. doctest::
>>> from mock import MagicMock
>>> thing = ProductionClass()
>>> thing.method = MagicMock(return_value=3)
>>> thing.method(3, 4, 5, key='value')
3
>>> thing.method.assert_called_with(3, 4, 5, key='value')
:attr:`side_effect` allows you to perform side effects, including raising an
exception when a mock is called:
.. doctest::
>>> mock = Mock(side_effect=KeyError('foo'))
>>> mock()
Traceback (most recent call last):
...
KeyError: 'foo'
>>> values = {'a': 1, 'b': 2, 'c': 3}
>>> def side_effect(arg):
... return values[arg]
...
>>> mock.side_effect = side_effect
>>> mock('a'), mock('b'), mock('c')
(1, 2, 3)
>>> mock.side_effect = [5, 4, 3, 2, 1]
>>> mock(), mock(), mock()
(5, 4, 3)
Mock has many other ways you can configure it and control its behaviour. For
example the `spec` argument configures the mock to take its specification
from another object. Attempting to access attributes or methods on the mock
that don't exist on the spec will fail with an `AttributeError`.
The :func:`patch` decorator / context manager makes it easy to mock classes or
objects in a module under test. The object you specify will be replaced with a
mock (or other object) during the test and restored when the test ends:
.. doctest::
>>> from mock import patch
>>> @patch('module.ClassName2')
... @patch('module.ClassName1')
... def test(MockClass1, MockClass2):
... module.ClassName1()
... module.ClassName2()
... assert MockClass1 is module.ClassName1
... assert MockClass2 is module.ClassName2
... assert MockClass1.called
... assert MockClass2.called
...
>>> test()
.. note::
When you nest patch decorators the mocks are passed in to the decorated
function in the same order they applied (the normal *python* order that
decorators are applied). This means from the bottom up, so in the example
above the mock for `module.ClassName1` is passed in first.
With `patch` it matters that you patch objects in the namespace where they
are looked up. This is normally straightforward, but for a quick guide
read :ref:`where to patch <where-to-patch>`.
As well as a decorator `patch` can be used as a context manager in a with
statement:
.. doctest::
>>> with patch.object(ProductionClass, 'method', return_value=None) as mock_method:
... thing = ProductionClass()
... thing.method(1, 2, 3)
...
>>> mock_method.assert_called_once_with(1, 2, 3)
There is also :func:`patch.dict` for setting values in a dictionary just
during a scope and restoring the dictionary to its original state when the test
ends:
.. doctest::
>>> foo = {'key': 'value'}
>>> original = foo.copy()
>>> with patch.dict(foo, {'newkey': 'newvalue'}, clear=True):
... assert foo == {'newkey': 'newvalue'}
...
>>> assert foo == original
Mock supports the mocking of Python :ref:`magic methods <magic-methods>`. The
easiest way of using magic methods is with the :class:`MagicMock` class. It
allows you to do things like:
.. doctest::
>>> mock = MagicMock()
>>> mock.__str__.return_value = 'foobarbaz'
>>> str(mock)
'foobarbaz'
>>> mock.__str__.assert_called_with()
Mock allows you to assign functions (or other Mock instances) to magic methods
and they will be called appropriately. The `MagicMock` class is just a Mock
variant that has all of the magic methods pre-created for you (well, all the
useful ones anyway).
The following is an example of using magic methods with the ordinary Mock
class:
.. doctest::
>>> mock = Mock()
>>> mock.__str__ = Mock(return_value='wheeeeee')
>>> str(mock)
'wheeeeee'
For ensuring that the mock objects in your tests have the same api as the
objects they are replacing, you can use :ref:`auto-speccing <auto-speccing>`.
Auto-speccing can be done through the `autospec` argument to patch, or the
:func:`create_autospec` function. Auto-speccing creates mock objects that
have the same attributes and methods as the objects they are replacing, and
any functions and methods (including constructors) have the same call
signature as the real object.
This ensures that your mocks will fail in the same way as your production
code if they are used incorrectly:
.. doctest::
>>> from mock import create_autospec
>>> def function(a, b, c):
... pass
...
>>> mock_function = create_autospec(function, return_value='fishy')
>>> mock_function(1, 2, 3)
'fishy'
>>> mock_function.assert_called_once_with(1, 2, 3)
>>> mock_function('wrong arguments')
Traceback (most recent call last):
...
TypeError: <lambda>() takes exactly 3 arguments (1 given)
`create_autospec` can also be used on classes, where it copies the signature of
the `__init__` method, and on callable objects where it copies the signature of
the `__call__` method.
.. index:: references
.. index:: articles
References
==========
Articles, blog entries and other stuff related to testing with Mock:
* `Imposing a No DB Discipline on Django unit tests
<https://github.com/carljm/django-testing-slides/blob/master/models/30_no_database.md>`_
* `mock-django: tools for mocking the Django ORM and models
<https://github.com/dcramer/mock-django>`_
* `PyCon 2011 Video: Testing with mock <https://blip.tv/file/4881513>`_
* `Mock objects in Python
<http://noopenblockers.com/2012/01/06/mock-objects-in-python/>`_
* `Python: Injecting Mock Objects for Powerful Testing
<http://blueprintforge.com/blog/2012/01/08/python-injecting-mock-objects-for-powerful-testing/>`_
* `Python Mock: How to assert a substring of logger output
<http://www.michaelpollmeier.com/python-mock-how-to-assert-a-substring-of-logger-output/>`_
* `Mocking Django <http://www.mattjmorrison.com/2011/09/mocking-django.html>`_
* `Mocking dates and other classes that can't be modified
<http://williamjohnbert.com/2011/07/how-to-unit-testing-in-django-with-mocking-and-patching/>`_
* `Mock recipes <http://konryd.blogspot.com/2010/06/mock-recipies.html>`_
* `Mockity mock mock - some love for the mock module
<http://konryd.blogspot.com/2010/05/mockity-mock-mock-some-love-for-mock.html>`_
* `Coverage and Mock (with django)
<http://mattsnider.com/python/mock-and-coverage/>`_
* `Python Unit Testing with Mock <http://www.insomnihack.com/?p=194>`_
* `Getting started with Python Mock
<http://myadventuresincoding.wordpress.com/2011/02/26/python-python-mock-cheat-sheet/>`_
* `Smart Parameter Checks with mock
<http://tobyho.com/2011/03/24/smart-parameter-checks-in/>`_
* `Python mock testing techniques and tools
<http://agiletesting.blogspot.com/2009/07/python-mock-testing-techniques-and.html>`_
* `How To Test Django Template Tags
<http://techblog.ironfroggy.com/2008/10/how-to-test.html>`_
* `A presentation on Unit Testing with Mock
<http://pypap.blogspot.com/2008/10/newbie-nugget-unit-testing-with-mock.html>`_
* `Mocking with Django and Google AppEngine
<http://michael-a-nelson.blogspot.com/2008/09/mocking-with-django-and-google-app.html>`_
.. index:: tests
.. index:: unittest2
Tests
=====
Mock uses `unittest2 <http://pypi.python.org/pypi/unittest2>`_ for its own
test suite. In order to run it, use the `unit2` script that comes with
`unittest2` module on a checkout of the source repository:
`unit2 discover`
If you have `setuptools <http://pypi.python.org/pypi/distribute>`_ as well as
unittest2 you can run:
``python setup.py test``
On Python 3.2 you can use ``unittest`` module from the standard library.
``python3.2 -m unittest discover``
.. index:: Python 3
On Python 3 the tests for unicode are skipped as they are not relevant. On
Python 2.4 tests that use the with statements are skipped as the with statement
is invalid syntax on Python 2.4.
.. index:: older versions
Older Versions
==============
Documentation for older versions of mock:
* `mock 0.8 <http://www.voidspace.org.uk/python/mock/0.8/>`_
* `mock 0.7 <http://www.voidspace.org.uk/python/mock/0.7/>`_
* `mock 0.6 <http://www.voidspace.org.uk/python/mock/0.6.0/>`_
Docs from the in-development version of `mock` can be found at
`mock.readthedocs.org <http://mock.readthedocs.org>`_.
Terminology
===========
Terminology for objects used to replace other ones can be confusing. Terms
like double, fake, mock, stub, and spy are all used with varying meanings.
In `classic mock terminology
<http://xunitpatterns.com/Mocks,%20Fakes,%20Stubs%20and%20Dummies.html>`_
:class:`mock.Mock` is a `spy <http://xunitpatterns.com/Test%20Spy.html>`_ that
allows for *post-mortem* examination. This is what I call the "action ->
assertion" [#]_ pattern of testing.
I'm not however a fan of this "statically typed mocking terminology"
promulgated by `Martin Fowler
<http://martinfowler.com/articles/mocksArentStubs.html>`_. It confuses usage
patterns with implementation and prevents you from using natural terminology
when discussing mocking.
I much prefer duck typing, if an object used in your test suite looks like a
mock object and quacks like a mock object then it's fine to call it a mock, no
matter what the implementation looks like.
This terminology is perhaps more useful in less capable languages where
different usage patterns will *require* different implementations.
`mock.Mock()` is capable of being used in most of the different roles
described by Fowler, except (annoyingly / frustratingly / ironically) a Mock
itself!
How about a simpler definition: a "mock object" is an object used to replace a
real one in a system under test.
.. [#] This pattern is called "AAA" by some members of the testing community;
"Arrange - Act - Assert".

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.. currentmodule:: mock
.. _magic-methods:
Mocking Magic Methods
=====================
.. currentmodule:: mock
:class:`Mock` supports mocking `magic methods
<http://www.ironpythoninaction.com/magic-methods.html>`_. This allows mock
objects to replace containers or other objects that implement Python
protocols.
Because magic methods are looked up differently from normal methods [#]_, this
support has been specially implemented. This means that only specific magic
methods are supported. The supported list includes *almost* all of them. If
there are any missing that you need please let us know!
You mock magic methods by setting the method you are interested in to a function
or a mock instance. If you are using a function then it *must* take ``self`` as
the first argument [#]_.
.. doctest::
>>> def __str__(self):
... return 'fooble'
...
>>> mock = Mock()
>>> mock.__str__ = __str__
>>> str(mock)
'fooble'
>>> mock = Mock()
>>> mock.__str__ = Mock()
>>> mock.__str__.return_value = 'fooble'
>>> str(mock)
'fooble'
>>> mock = Mock()
>>> mock.__iter__ = Mock(return_value=iter([]))
>>> list(mock)
[]
One use case for this is for mocking objects used as context managers in a
`with` statement:
.. doctest::
>>> mock = Mock()
>>> mock.__enter__ = Mock(return_value='foo')
>>> mock.__exit__ = Mock(return_value=False)
>>> with mock as m:
... assert m == 'foo'
...
>>> mock.__enter__.assert_called_with()
>>> mock.__exit__.assert_called_with(None, None, None)
Calls to magic methods do not appear in :attr:`~Mock.method_calls`, but they
are recorded in :attr:`~Mock.mock_calls`.
.. note::
If you use the `spec` keyword argument to create a mock then attempting to
set a magic method that isn't in the spec will raise an `AttributeError`.
The full list of supported magic methods is:
* ``__hash__``, ``__sizeof__``, ``__repr__`` and ``__str__``
* ``__dir__``, ``__format__`` and ``__subclasses__``
* ``__floor__``, ``__trunc__`` and ``__ceil__``
* Comparisons: ``__cmp__``, ``__lt__``, ``__gt__``, ``__le__``, ``__ge__``,
``__eq__`` and ``__ne__``
* Container methods: ``__getitem__``, ``__setitem__``, ``__delitem__``,
``__contains__``, ``__len__``, ``__iter__``, ``__getslice__``,
``__setslice__``, ``__reversed__`` and ``__missing__``
* Context manager: ``__enter__`` and ``__exit__``
* Unary numeric methods: ``__neg__``, ``__pos__`` and ``__invert__``
* The numeric methods (including right hand and in-place variants):
``__add__``, ``__sub__``, ``__mul__``, ``__div__``,
``__floordiv__``, ``__mod__``, ``__divmod__``, ``__lshift__``,
``__rshift__``, ``__and__``, ``__xor__``, ``__or__``, and ``__pow__``
* Numeric conversion methods: ``__complex__``, ``__int__``, ``__float__``,
``__index__`` and ``__coerce__``
* Descriptor methods: ``__get__``, ``__set__`` and ``__delete__``
* Pickling: ``__reduce__``, ``__reduce_ex__``, ``__getinitargs__``,
``__getnewargs__``, ``__getstate__`` and ``__setstate__``
The following methods are supported in Python 2 but don't exist in Python 3:
* ``__unicode__``, ``__long__``, ``__oct__``, ``__hex__`` and ``__nonzero__``
* ``__truediv__`` and ``__rtruediv__``
The following methods are supported in Python 3 but don't exist in Python 2:
* ``__bool__`` and ``__next__``
The following methods exist but are *not* supported as they are either in use by
mock, can't be set dynamically, or can cause problems:
* ``__getattr__``, ``__setattr__``, ``__init__`` and ``__new__``
* ``__prepare__``, ``__instancecheck__``, ``__subclasscheck__``, ``__del__``
Magic Mock
==========
There are two `MagicMock` variants: `MagicMock` and `NonCallableMagicMock`.
.. class:: MagicMock(*args, **kw)
``MagicMock`` is a subclass of :class:`Mock` with default implementations
of most of the magic methods. You can use ``MagicMock`` without having to
configure the magic methods yourself.
The constructor parameters have the same meaning as for :class:`Mock`.
If you use the `spec` or `spec_set` arguments then *only* magic methods
that exist in the spec will be created.
.. class:: NonCallableMagicMock(*args, **kw)
A non-callable version of `MagicMock`.
The constructor parameters have the same meaning as for
:class:`MagicMock`, with the exception of `return_value` and
`side_effect` which have no meaning on a non-callable mock.
The magic methods are setup with `MagicMock` objects, so you can configure them
and use them in the usual way:
.. doctest::
>>> mock = MagicMock()
>>> mock[3] = 'fish'
>>> mock.__setitem__.assert_called_with(3, 'fish')
>>> mock.__getitem__.return_value = 'result'
>>> mock[2]
'result'
By default many of the protocol methods are required to return objects of a
specific type. These methods are preconfigured with a default return value, so
that they can be used without you having to do anything if you aren't interested
in the return value. You can still *set* the return value manually if you want
to change the default.
Methods and their defaults:
* ``__lt__``: NotImplemented
* ``__gt__``: NotImplemented
* ``__le__``: NotImplemented
* ``__ge__``: NotImplemented
* ``__int__`` : 1
* ``__contains__`` : False
* ``__len__`` : 1
* ``__iter__`` : iter([])
* ``__exit__`` : False
* ``__complex__`` : 1j
* ``__float__`` : 1.0
* ``__bool__`` : True
* ``__nonzero__`` : True
* ``__oct__`` : '1'
* ``__hex__`` : '0x1'
* ``__long__`` : long(1)
* ``__index__`` : 1
* ``__hash__`` : default hash for the mock
* ``__str__`` : default str for the mock
* ``__unicode__`` : default unicode for the mock
* ``__sizeof__``: default sizeof for the mock
For example:
.. doctest::
>>> mock = MagicMock()
>>> int(mock)
1
>>> len(mock)
0
>>> hex(mock)
'0x1'
>>> list(mock)
[]
>>> object() in mock
False
The two equality method, `__eq__` and `__ne__`, are special (changed in
0.7.2). They do the default equality comparison on identity, using a side
effect, unless you change their return value to return something else:
.. doctest::
>>> MagicMock() == 3
False
>>> MagicMock() != 3
True
>>> mock = MagicMock()
>>> mock.__eq__.return_value = True
>>> mock == 3
True
In `0.8` the `__iter__` also gained special handling implemented with a
side effect. The return value of `MagicMock.__iter__` can be any iterable
object and isn't required to be an iterator:
.. doctest::
>>> mock = MagicMock()
>>> mock.__iter__.return_value = ['a', 'b', 'c']
>>> list(mock)
['a', 'b', 'c']
>>> list(mock)
['a', 'b', 'c']
If the return value *is* an iterator, then iterating over it once will consume
it and subsequent iterations will result in an empty list:
.. doctest::
>>> mock.__iter__.return_value = iter(['a', 'b', 'c'])
>>> list(mock)
['a', 'b', 'c']
>>> list(mock)
[]
``MagicMock`` has all of the supported magic methods configured except for some
of the obscure and obsolete ones. You can still set these up if you want.
Magic methods that are supported but not setup by default in ``MagicMock`` are:
* ``__cmp__``
* ``__getslice__`` and ``__setslice__``
* ``__coerce__``
* ``__subclasses__``
* ``__dir__``
* ``__format__``
* ``__get__``, ``__set__`` and ``__delete__``
* ``__reversed__`` and ``__missing__``
* ``__reduce__``, ``__reduce_ex__``, ``__getinitargs__``, ``__getnewargs__``,
``__getstate__`` and ``__setstate__``
* ``__getformat__`` and ``__setformat__``
------------
.. [#] Magic methods *should* be looked up on the class rather than the
instance. Different versions of Python are inconsistent about applying this
rule. The supported protocol methods should work with all supported versions
of Python.
.. [#] The function is basically hooked up to the class, but each ``Mock``
instance is kept isolated from the others.

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The Mock Class
==============
.. currentmodule:: mock
.. testsetup::
class SomeClass:
pass
`Mock` is a flexible mock object intended to replace the use of stubs and
test doubles throughout your code. Mocks are callable and create attributes as
new mocks when you access them [#]_. Accessing the same attribute will always
return the same mock. Mocks record how you use them, allowing you to make
assertions about what your code has done to them.
:class:`MagicMock` is a subclass of `Mock` with all the magic methods
pre-created and ready to use. There are also non-callable variants, useful
when you are mocking out objects that aren't callable:
:class:`NonCallableMock` and :class:`NonCallableMagicMock`
The :func:`patch` decorators makes it easy to temporarily replace classes
in a particular module with a `Mock` object. By default `patch` will create
a `MagicMock` for you. You can specify an alternative class of `Mock` using
the `new_callable` argument to `patch`.
.. index:: side_effect
.. index:: return_value
.. index:: wraps
.. index:: name
.. index:: spec
.. class:: Mock(spec=None, side_effect=None, return_value=DEFAULT, wraps=None, name=None, spec_set=None, **kwargs)
Create a new `Mock` object. `Mock` takes several optional arguments
that specify the behaviour of the Mock object:
* `spec`: This can be either a list of strings or an existing object (a
class or instance) that acts as the specification for the mock object. If
you pass in an object then a list of strings is formed by calling dir on
the object (excluding unsupported magic attributes and methods).
Accessing any attribute not in this list will raise an `AttributeError`.
If `spec` is an object (rather than a list of strings) then
:attr:`__class__` returns the class of the spec object. This allows mocks
to pass `isinstance` tests.
* `spec_set`: A stricter variant of `spec`. If used, attempting to *set*
or get an attribute on the mock that isn't on the object passed as
`spec_set` will raise an `AttributeError`.
* `side_effect`: A function to be called whenever the Mock is called. See
the :attr:`~Mock.side_effect` attribute. Useful for raising exceptions or
dynamically changing return values. The function is called with the same
arguments as the mock, and unless it returns :data:`DEFAULT`, the return
value of this function is used as the return value.
Alternatively `side_effect` can be an exception class or instance. In
this case the exception will be raised when the mock is called.
If `side_effect` is an iterable then each call to the mock will return
the next value from the iterable. If any of the members of the iterable
are exceptions they will be raised instead of returned.
A `side_effect` can be cleared by setting it to `None`.
* `return_value`: The value returned when the mock is called. By default
this is a new Mock (created on first access). See the
:attr:`return_value` attribute.
* `wraps`: Item for the mock object to wrap. If `wraps` is not None then
calling the Mock will pass the call through to the wrapped object
(returning the real result and ignoring `return_value`). Attribute access
on the mock will return a Mock object that wraps the corresponding
attribute of the wrapped object (so attempting to access an attribute
that doesn't exist will raise an `AttributeError`).
If the mock has an explicit `return_value` set then calls are not passed
to the wrapped object and the `return_value` is returned instead.
* `name`: If the mock has a name then it will be used in the repr of the
mock. This can be useful for debugging. The name is propagated to child
mocks.
Mocks can also be called with arbitrary keyword arguments. These will be
used to set attributes on the mock after it is created. See the
:meth:`configure_mock` method for details.
.. method:: assert_called_with(*args, **kwargs)
This method is a convenient way of asserting that calls are made in a
particular way:
.. doctest::
>>> mock = Mock()
>>> mock.method(1, 2, 3, test='wow')
<Mock name='mock.method()' id='...'>
>>> mock.method.assert_called_with(1, 2, 3, test='wow')
.. method:: assert_called_once_with(*args, **kwargs)
Assert that the mock was called exactly once and with the specified
arguments.
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock('foo', bar='baz')
>>> mock.assert_called_once_with('foo', bar='baz')
>>> mock('foo', bar='baz')
>>> mock.assert_called_once_with('foo', bar='baz')
Traceback (most recent call last):
...
AssertionError: Expected to be called once. Called 2 times.
.. method:: assert_any_call(*args, **kwargs)
assert the mock has been called with the specified arguments.
The assert passes if the mock has *ever* been called, unlike
:meth:`assert_called_with` and :meth:`assert_called_once_with` that
only pass if the call is the most recent one.
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock(1, 2, arg='thing')
>>> mock('some', 'thing', 'else')
>>> mock.assert_any_call(1, 2, arg='thing')
.. method:: assert_has_calls(calls, any_order=False)
assert the mock has been called with the specified calls.
The `mock_calls` list is checked for the calls.
If `any_order` is False (the default) then the calls must be
sequential. There can be extra calls before or after the
specified calls.
If `any_order` is True then the calls can be in any order, but
they must all appear in :attr:`mock_calls`.
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock(1)
>>> mock(2)
>>> mock(3)
>>> mock(4)
>>> calls = [call(2), call(3)]
>>> mock.assert_has_calls(calls)
>>> calls = [call(4), call(2), call(3)]
>>> mock.assert_has_calls(calls, any_order=True)
.. method:: reset_mock()
The reset_mock method resets all the call attributes on a mock object:
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock('hello')
>>> mock.called
True
>>> mock.reset_mock()
>>> mock.called
False
This can be useful where you want to make a series of assertions that
reuse the same object. Note that `reset_mock` *doesn't* clear the
return value, :attr:`side_effect` or any child attributes you have
set using normal assignment. Child mocks and the return value mock
(if any) are reset as well.
.. method:: mock_add_spec(spec, spec_set=False)
Add a spec to a mock. `spec` can either be an object or a
list of strings. Only attributes on the `spec` can be fetched as
attributes from the mock.
If `spec_set` is `True` then only attributes on the spec can be set.
.. method:: attach_mock(mock, attribute)
Attach a mock as an attribute of this one, replacing its name and
parent. Calls to the attached mock will be recorded in the
:attr:`method_calls` and :attr:`mock_calls` attributes of this one.
.. method:: configure_mock(**kwargs)
Set attributes on the mock through keyword arguments.
Attributes plus return values and side effects can be set on child
mocks using standard dot notation and unpacking a dictionary in the
method call:
.. doctest::
>>> mock = Mock()
>>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
>>> mock.configure_mock(**attrs)
>>> mock.method()
3
>>> mock.other()
Traceback (most recent call last):
...
KeyError
The same thing can be achieved in the constructor call to mocks:
.. doctest::
>>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
>>> mock = Mock(some_attribute='eggs', **attrs)
>>> mock.some_attribute
'eggs'
>>> mock.method()
3
>>> mock.other()
Traceback (most recent call last):
...
KeyError
`configure_mock` exists to make it easier to do configuration
after the mock has been created.
.. method:: __dir__()
`Mock` objects limit the results of `dir(some_mock)` to useful results.
For mocks with a `spec` this includes all the permitted attributes
for the mock.
See :data:`FILTER_DIR` for what this filtering does, and how to
switch it off.
.. method:: _get_child_mock(**kw)
Create the child mocks for attributes and return value.
By default child mocks will be the same type as the parent.
Subclasses of Mock may want to override this to customize the way
child mocks are made.
For non-callable mocks the callable variant will be used (rather than
any custom subclass).
.. attribute:: called
A boolean representing whether or not the mock object has been called:
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock.called
False
>>> mock()
>>> mock.called
True
.. attribute:: call_count
An integer telling you how many times the mock object has been called:
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock.call_count
0
>>> mock()
>>> mock()
>>> mock.call_count
2
.. attribute:: return_value
Set this to configure the value returned by calling the mock:
.. doctest::
>>> mock = Mock()
>>> mock.return_value = 'fish'
>>> mock()
'fish'
The default return value is a mock object and you can configure it in
the normal way:
.. doctest::
>>> mock = Mock()
>>> mock.return_value.attribute = sentinel.Attribute
>>> mock.return_value()
<Mock name='mock()()' id='...'>
>>> mock.return_value.assert_called_with()
`return_value` can also be set in the constructor:
.. doctest::
>>> mock = Mock(return_value=3)
>>> mock.return_value
3
>>> mock()
3
.. attribute:: side_effect
This can either be a function to be called when the mock is called,
or an exception (class or instance) to be raised.
If you pass in a function it will be called with same arguments as the
mock and unless the function returns the :data:`DEFAULT` singleton the
call to the mock will then return whatever the function returns. If the
function returns :data:`DEFAULT` then the mock will return its normal
value (from the :attr:`return_value`.
An example of a mock that raises an exception (to test exception
handling of an API):
.. doctest::
>>> mock = Mock()
>>> mock.side_effect = Exception('Boom!')
>>> mock()
Traceback (most recent call last):
...
Exception: Boom!
Using `side_effect` to return a sequence of values:
.. doctest::
>>> mock = Mock()
>>> mock.side_effect = [3, 2, 1]
>>> mock(), mock(), mock()
(3, 2, 1)
The `side_effect` function is called with the same arguments as the
mock (so it is wise for it to take arbitrary args and keyword
arguments) and whatever it returns is used as the return value for
the call. The exception is if `side_effect` returns :data:`DEFAULT`,
in which case the normal :attr:`return_value` is used.
.. doctest::
>>> mock = Mock(return_value=3)
>>> def side_effect(*args, **kwargs):
... return DEFAULT
...
>>> mock.side_effect = side_effect
>>> mock()
3
`side_effect` can be set in the constructor. Here's an example that
adds one to the value the mock is called with and returns it:
.. doctest::
>>> side_effect = lambda value: value + 1
>>> mock = Mock(side_effect=side_effect)
>>> mock(3)
4
>>> mock(-8)
-7
Setting `side_effect` to `None` clears it:
.. doctest::
>>> from mock import Mock
>>> m = Mock(side_effect=KeyError, return_value=3)
>>> m()
Traceback (most recent call last):
...
KeyError
>>> m.side_effect = None
>>> m()
3
.. attribute:: call_args
This is either `None` (if the mock hasn't been called), or the
arguments that the mock was last called with. This will be in the
form of a tuple: the first member is any ordered arguments the mock
was called with (or an empty tuple) and the second member is any
keyword arguments (or an empty dictionary).
.. doctest::
>>> mock = Mock(return_value=None)
>>> print mock.call_args
None
>>> mock()
>>> mock.call_args
call()
>>> mock.call_args == ()
True
>>> mock(3, 4)
>>> mock.call_args
call(3, 4)
>>> mock.call_args == ((3, 4),)
True
>>> mock(3, 4, 5, key='fish', next='w00t!')
>>> mock.call_args
call(3, 4, 5, key='fish', next='w00t!')
`call_args`, along with members of the lists :attr:`call_args_list`,
:attr:`method_calls` and :attr:`mock_calls` are :data:`call` objects.
These are tuples, so they can be unpacked to get at the individual
arguments and make more complex assertions. See
:ref:`calls as tuples <calls-as-tuples>`.
.. attribute:: call_args_list
This is a list of all the calls made to the mock object in sequence
(so the length of the list is the number of times it has been
called). Before any calls have been made it is an empty list. The
:data:`call` object can be used for conveniently constructing lists of
calls to compare with `call_args_list`.
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock()
>>> mock(3, 4)
>>> mock(key='fish', next='w00t!')
>>> mock.call_args_list
[call(), call(3, 4), call(key='fish', next='w00t!')]
>>> expected = [(), ((3, 4),), ({'key': 'fish', 'next': 'w00t!'},)]
>>> mock.call_args_list == expected
True
Members of `call_args_list` are :data:`call` objects. These can be
unpacked as tuples to get at the individual arguments. See
:ref:`calls as tuples <calls-as-tuples>`.
.. attribute:: method_calls
As well as tracking calls to themselves, mocks also track calls to
methods and attributes, and *their* methods and attributes:
.. doctest::
>>> mock = Mock()
>>> mock.method()
<Mock name='mock.method()' id='...'>
>>> mock.property.method.attribute()
<Mock name='mock.property.method.attribute()' id='...'>
>>> mock.method_calls
[call.method(), call.property.method.attribute()]
Members of `method_calls` are :data:`call` objects. These can be
unpacked as tuples to get at the individual arguments. See
:ref:`calls as tuples <calls-as-tuples>`.
.. attribute:: mock_calls
`mock_calls` records *all* calls to the mock object, its methods, magic
methods *and* return value mocks.
.. doctest::
>>> mock = MagicMock()
>>> result = mock(1, 2, 3)
>>> mock.first(a=3)
<MagicMock name='mock.first()' id='...'>
>>> mock.second()
<MagicMock name='mock.second()' id='...'>
>>> int(mock)
1
>>> result(1)
<MagicMock name='mock()()' id='...'>
>>> expected = [call(1, 2, 3), call.first(a=3), call.second(),
... call.__int__(), call()(1)]
>>> mock.mock_calls == expected
True
Members of `mock_calls` are :data:`call` objects. These can be
unpacked as tuples to get at the individual arguments. See
:ref:`calls as tuples <calls-as-tuples>`.
.. attribute:: __class__
Normally the `__class__` attribute of an object will return its type.
For a mock object with a `spec` `__class__` returns the spec class
instead. This allows mock objects to pass `isinstance` tests for the
object they are replacing / masquerading as:
.. doctest::
>>> mock = Mock(spec=3)
>>> isinstance(mock, int)
True
`__class__` is assignable to, this allows a mock to pass an
`isinstance` check without forcing you to use a spec:
.. doctest::
>>> mock = Mock()
>>> mock.__class__ = dict
>>> isinstance(mock, dict)
True
.. class:: NonCallableMock(spec=None, wraps=None, name=None, spec_set=None, **kwargs)
A non-callable version of `Mock`. The constructor parameters have the same
meaning of `Mock`, with the exception of `return_value` and `side_effect`
which have no meaning on a non-callable mock.
Mock objects that use a class or an instance as a `spec` or `spec_set` are able
to pass `isintance` tests:
.. doctest::
>>> mock = Mock(spec=SomeClass)
>>> isinstance(mock, SomeClass)
True
>>> mock = Mock(spec_set=SomeClass())
>>> isinstance(mock, SomeClass)
True
The `Mock` classes have support for mocking magic methods. See :ref:`magic
methods <magic-methods>` for the full details.
The mock classes and the :func:`patch` decorators all take arbitrary keyword
arguments for configuration. For the `patch` decorators the keywords are
passed to the constructor of the mock being created. The keyword arguments
are for configuring attributes of the mock:
.. doctest::
>>> m = MagicMock(attribute=3, other='fish')
>>> m.attribute
3
>>> m.other
'fish'
The return value and side effect of child mocks can be set in the same way,
using dotted notation. As you can't use dotted names directly in a call you
have to create a dictionary and unpack it using `**`:
.. doctest::
>>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
>>> mock = Mock(some_attribute='eggs', **attrs)
>>> mock.some_attribute
'eggs'
>>> mock.method()
3
>>> mock.other()
Traceback (most recent call last):
...
KeyError
.. class:: PropertyMock(*args, **kwargs)
A mock intended to be used as a property, or other descriptor, on a class.
`PropertyMock` provides `__get__` and `__set__` methods so you can specify
a return value when it is fetched.
Fetching a `PropertyMock` instance from an object calls the mock, with
no args. Setting it calls the mock with the value being set.
.. doctest::
>>> class Foo(object):
... @property
... def foo(self):
... return 'something'
... @foo.setter
... def foo(self, value):
... pass
...
>>> with patch('__main__.Foo.foo', new_callable=PropertyMock) as mock_foo:
... mock_foo.return_value = 'mockity-mock'
... this_foo = Foo()
... print this_foo.foo
... this_foo.foo = 6
...
mockity-mock
>>> mock_foo.mock_calls
[call(), call(6)]
Because of the way mock attributes are stored you can't directly attach a
`PropertyMock` to a mock object. Instead you can attach it to the mock type
object:
.. doctest::
>>> m = MagicMock()
>>> p = PropertyMock(return_value=3)
>>> type(m).foo = p
>>> m.foo
3
>>> p.assert_called_once_with()
.. index:: __call__
.. index:: calling
Calling
=======
Mock objects are callable. The call will return the value set as the
:attr:`~Mock.return_value` attribute. The default return value is a new Mock
object; it is created the first time the return value is accessed (either
explicitly or by calling the Mock) - but it is stored and the same one
returned each time.
Calls made to the object will be recorded in the attributes
like :attr:`~Mock.call_args` and :attr:`~Mock.call_args_list`.
If :attr:`~Mock.side_effect` is set then it will be called after the call has
been recorded, so if `side_effect` raises an exception the call is still
recorded.
The simplest way to make a mock raise an exception when called is to make
:attr:`~Mock.side_effect` an exception class or instance:
.. doctest::
>>> m = MagicMock(side_effect=IndexError)
>>> m(1, 2, 3)
Traceback (most recent call last):
...
IndexError
>>> m.mock_calls
[call(1, 2, 3)]
>>> m.side_effect = KeyError('Bang!')
>>> m('two', 'three', 'four')
Traceback (most recent call last):
...
KeyError: 'Bang!'
>>> m.mock_calls
[call(1, 2, 3), call('two', 'three', 'four')]
If `side_effect` is a function then whatever that function returns is what
calls to the mock return. The `side_effect` function is called with the
same arguments as the mock. This allows you to vary the return value of the
call dynamically, based on the input:
.. doctest::
>>> def side_effect(value):
... return value + 1
...
>>> m = MagicMock(side_effect=side_effect)
>>> m(1)
2
>>> m(2)
3
>>> m.mock_calls
[call(1), call(2)]
If you want the mock to still return the default return value (a new mock), or
any set return value, then there are two ways of doing this. Either return
`mock.return_value` from inside `side_effect`, or return :data:`DEFAULT`:
.. doctest::
>>> m = MagicMock()
>>> def side_effect(*args, **kwargs):
... return m.return_value
...
>>> m.side_effect = side_effect
>>> m.return_value = 3
>>> m()
3
>>> def side_effect(*args, **kwargs):
... return DEFAULT
...
>>> m.side_effect = side_effect
>>> m()
3
To remove a `side_effect`, and return to the default behaviour, set the
`side_effect` to `None`:
.. doctest::
>>> m = MagicMock(return_value=6)
>>> def side_effect(*args, **kwargs):
... return 3
...
>>> m.side_effect = side_effect
>>> m()
3
>>> m.side_effect = None
>>> m()
6
The `side_effect` can also be any iterable object. Repeated calls to the mock
will return values from the iterable (until the iterable is exhausted and
a `StopIteration` is raised):
.. doctest::
>>> m = MagicMock(side_effect=[1, 2, 3])
>>> m()
1
>>> m()
2
>>> m()
3
>>> m()
Traceback (most recent call last):
...
StopIteration
If any members of the iterable are exceptions they will be raised instead of
returned:
.. doctest::
>>> iterable = (33, ValueError, 66)
>>> m = MagicMock(side_effect=iterable)
>>> m()
33
>>> m()
Traceback (most recent call last):
...
ValueError
>>> m()
66
.. _deleting-attributes:
Deleting Attributes
===================
Mock objects create attributes on demand. This allows them to pretend to be
objects of any type.
You may want a mock object to return `False` to a `hasattr` call, or raise an
`AttributeError` when an attribute is fetched. You can do this by providing
an object as a `spec` for a mock, but that isn't always convenient.
You "block" attributes by deleting them. Once deleted, accessing an attribute
will raise an `AttributeError`.
.. doctest::
>>> mock = MagicMock()
>>> hasattr(mock, 'm')
True
>>> del mock.m
>>> hasattr(mock, 'm')
False
>>> del mock.f
>>> mock.f
Traceback (most recent call last):
...
AttributeError: f
Attaching Mocks as Attributes
=============================
When you attach a mock as an attribute of another mock (or as the return
value) it becomes a "child" of that mock. Calls to the child are recorded in
the :attr:`~Mock.method_calls` and :attr:`~Mock.mock_calls` attributes of the
parent. This is useful for configuring child mocks and then attaching them to
the parent, or for attaching mocks to a parent that records all calls to the
children and allows you to make assertions about the order of calls between
mocks:
.. doctest::
>>> parent = MagicMock()
>>> child1 = MagicMock(return_value=None)
>>> child2 = MagicMock(return_value=None)
>>> parent.child1 = child1
>>> parent.child2 = child2
>>> child1(1)
>>> child2(2)
>>> parent.mock_calls
[call.child1(1), call.child2(2)]
The exception to this is if the mock has a name. This allows you to prevent
the "parenting" if for some reason you don't want it to happen.
.. doctest::
>>> mock = MagicMock()
>>> not_a_child = MagicMock(name='not-a-child')
>>> mock.attribute = not_a_child
>>> mock.attribute()
<MagicMock name='not-a-child()' id='...'>
>>> mock.mock_calls
[]
Mocks created for you by :func:`patch` are automatically given names. To
attach mocks that have names to a parent you use the :meth:`~Mock.attach_mock`
method:
.. doctest::
>>> thing1 = object()
>>> thing2 = object()
>>> parent = MagicMock()
>>> with patch('__main__.thing1', return_value=None) as child1:
... with patch('__main__.thing2', return_value=None) as child2:
... parent.attach_mock(child1, 'child1')
... parent.attach_mock(child2, 'child2')
... child1('one')
... child2('two')
...
>>> parent.mock_calls
[call.child1('one'), call.child2('two')]
-----
.. [#] The only exceptions are magic methods and attributes (those that have
leading and trailing double underscores). Mock doesn't create these but
instead of raises an ``AttributeError``. This is because the interpreter
will often implicitly request these methods, and gets *very* confused to
get a new Mock object when it expects a magic method. If you need magic
method support see :ref:`magic methods <magic-methods>`.

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==================
Patch Decorators
==================
.. currentmodule:: mock
.. testsetup::
class SomeClass(object):
static_method = None
class_method = None
attribute = None
sys.modules['package'] = package = Mock(name='package')
sys.modules['package.module'] = package.module
class TestCase(unittest2.TestCase):
def run(self):
result = unittest2.TestResult()
super(unittest2.TestCase, self).run(result)
assert result.wasSuccessful()
.. testcleanup::
patch.TEST_PREFIX = 'test'
The patch decorators are used for patching objects only within the scope of
the function they decorate. They automatically handle the unpatching for you,
even if exceptions are raised. All of these functions can also be used in with
statements or as class decorators.
patch
=====
.. note::
`patch` is straightforward to use. The key is to do the patching in the
right namespace. See the section `where to patch`_.
.. function:: patch(target, new=DEFAULT, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)
`patch` acts as a function decorator, class decorator or a context
manager. Inside the body of the function or with statement, the `target`
is patched with a `new` object. When the function/with statement exits
the patch is undone.
If `new` is omitted, then the target is replaced with a
:class:`MagicMock`. If `patch` is used as a decorator and `new` is
omitted, the created mock is passed in as an extra argument to the
decorated function. If `patch` is used as a context manager the created
mock is returned by the context manager.
`target` should be a string in the form `'package.module.ClassName'`. The
`target` is imported and the specified object replaced with the `new`
object, so the `target` must be importable from the environment you are
calling `patch` from. The target is imported when the decorated function
is executed, not at decoration time.
The `spec` and `spec_set` keyword arguments are passed to the `MagicMock`
if patch is creating one for you.
In addition you can pass `spec=True` or `spec_set=True`, which causes
patch to pass in the object being mocked as the spec/spec_set object.
`new_callable` allows you to specify a different class, or callable object,
that will be called to create the `new` object. By default `MagicMock` is
used.
A more powerful form of `spec` is `autospec`. If you set `autospec=True`
then the mock with be created with a spec from the object being replaced.
All attributes of the mock will also have the spec of the corresponding
attribute of the object being replaced. Methods and functions being mocked
will have their arguments checked and will raise a `TypeError` if they are
called with the wrong signature. For mocks
replacing a class, their return value (the 'instance') will have the same
spec as the class. See the :func:`create_autospec` function and
:ref:`auto-speccing`.
Instead of `autospec=True` you can pass `autospec=some_object` to use an
arbitrary object as the spec instead of the one being replaced.
By default `patch` will fail to replace attributes that don't exist. If
you pass in `create=True`, and the attribute doesn't exist, patch will
create the attribute for you when the patched function is called, and
delete it again afterwards. This is useful for writing tests against
attributes that your production code creates at runtime. It is off by by
default because it can be dangerous. With it switched on you can write
passing tests against APIs that don't actually exist!
Patch can be used as a `TestCase` class decorator. It works by
decorating each test method in the class. This reduces the boilerplate
code when your test methods share a common patchings set. `patch` finds
tests by looking for method names that start with `patch.TEST_PREFIX`.
By default this is `test`, which matches the way `unittest` finds tests.
You can specify an alternative prefix by setting `patch.TEST_PREFIX`.
Patch can be used as a context manager, with the with statement. Here the
patching applies to the indented block after the with statement. If you
use "as" then the patched object will be bound to the name after the
"as"; very useful if `patch` is creating a mock object for you.
`patch` takes arbitrary keyword arguments. These will be passed to
the `Mock` (or `new_callable`) on construction.
`patch.dict(...)`, `patch.multiple(...)` and `patch.object(...)` are
available for alternate use-cases.
`patch` as function decorator, creating the mock for you and passing it into
the decorated function:
.. doctest::
>>> @patch('__main__.SomeClass')
... def function(normal_argument, mock_class):
... print mock_class is SomeClass
...
>>> function(None)
True
Patching a class replaces the class with a `MagicMock` *instance*. If the
class is instantiated in the code under test then it will be the
:attr:`~Mock.return_value` of the mock that will be used.
If the class is instantiated multiple times you could use
:attr:`~Mock.side_effect` to return a new mock each time. Alternatively you
can set the `return_value` to be anything you want.
To configure return values on methods of *instances* on the patched class
you must do this on the `return_value`. For example:
.. doctest::
>>> class Class(object):
... def method(self):
... pass
...
>>> with patch('__main__.Class') as MockClass:
... instance = MockClass.return_value
... instance.method.return_value = 'foo'
... assert Class() is instance
... assert Class().method() == 'foo'
...
If you use `spec` or `spec_set` and `patch` is replacing a *class*, then the
return value of the created mock will have the same spec.
.. doctest::
>>> Original = Class
>>> patcher = patch('__main__.Class', spec=True)
>>> MockClass = patcher.start()
>>> instance = MockClass()
>>> assert isinstance(instance, Original)
>>> patcher.stop()
The `new_callable` argument is useful where you want to use an alternative
class to the default :class:`MagicMock` for the created mock. For example, if
you wanted a :class:`NonCallableMock` to be used:
.. doctest::
>>> thing = object()
>>> with patch('__main__.thing', new_callable=NonCallableMock) as mock_thing:
... assert thing is mock_thing
... thing()
...
Traceback (most recent call last):
...
TypeError: 'NonCallableMock' object is not callable
Another use case might be to replace an object with a `StringIO` instance:
.. doctest::
>>> from StringIO import StringIO
>>> def foo():
... print 'Something'
...
>>> @patch('sys.stdout', new_callable=StringIO)
... def test(mock_stdout):
... foo()
... assert mock_stdout.getvalue() == 'Something\n'
...
>>> test()
When `patch` is creating a mock for you, it is common that the first thing
you need to do is to configure the mock. Some of that configuration can be done
in the call to patch. Any arbitrary keywords you pass into the call will be
used to set attributes on the created mock:
.. doctest::
>>> patcher = patch('__main__.thing', first='one', second='two')
>>> mock_thing = patcher.start()
>>> mock_thing.first
'one'
>>> mock_thing.second
'two'
As well as attributes on the created mock attributes, like the
:attr:`~Mock.return_value` and :attr:`~Mock.side_effect`, of child mocks can
also be configured. These aren't syntactically valid to pass in directly as
keyword arguments, but a dictionary with these as keys can still be expanded
into a `patch` call using `**`:
.. doctest::
>>> config = {'method.return_value': 3, 'other.side_effect': KeyError}
>>> patcher = patch('__main__.thing', **config)
>>> mock_thing = patcher.start()
>>> mock_thing.method()
3
>>> mock_thing.other()
Traceback (most recent call last):
...
KeyError
patch.object
============
.. function:: patch.object(target, attribute, new=DEFAULT, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)
patch the named member (`attribute`) on an object (`target`) with a mock
object.
`patch.object` can be used as a decorator, class decorator or a context
manager. Arguments `new`, `spec`, `create`, `spec_set`, `autospec` and
`new_callable` have the same meaning as for `patch`. Like `patch`,
`patch.object` takes arbitrary keyword arguments for configuring the mock
object it creates.
When used as a class decorator `patch.object` honours `patch.TEST_PREFIX`
for choosing which methods to wrap.
You can either call `patch.object` with three arguments or two arguments. The
three argument form takes the object to be patched, the attribute name and the
object to replace the attribute with.
When calling with the two argument form you omit the replacement object, and a
mock is created for you and passed in as an extra argument to the decorated
function:
.. doctest::
>>> @patch.object(SomeClass, 'class_method')
... def test(mock_method):
... SomeClass.class_method(3)
... mock_method.assert_called_with(3)
...
>>> test()
`spec`, `create` and the other arguments to `patch.object` have the same
meaning as they do for `patch`.
patch.dict
==========
.. function:: patch.dict(in_dict, values=(), clear=False, **kwargs)
Patch a dictionary, or dictionary like object, and restore the dictionary
to its original state after the test.
`in_dict` can be a dictionary or a mapping like container. If it is a
mapping then it must at least support getting, setting and deleting items
plus iterating over keys.
`in_dict` can also be a string specifying the name of the dictionary, which
will then be fetched by importing it.
`values` can be a dictionary of values to set in the dictionary. `values`
can also be an iterable of `(key, value)` pairs.
If `clear` is True then the dictionary will be cleared before the new
values are set.
`patch.dict` can also be called with arbitrary keyword arguments to set
values in the dictionary.
`patch.dict` can be used as a context manager, decorator or class
decorator. When used as a class decorator `patch.dict` honours
`patch.TEST_PREFIX` for choosing which methods to wrap.
`patch.dict` can be used to add members to a dictionary, or simply let a test
change a dictionary, and ensure the dictionary is restored when the test
ends.
.. doctest::
>>> from mock import patch
>>> foo = {}
>>> with patch.dict(foo, {'newkey': 'newvalue'}):
... assert foo == {'newkey': 'newvalue'}
...
>>> assert foo == {}
>>> import os
>>> with patch.dict('os.environ', {'newkey': 'newvalue'}):
... print os.environ['newkey']
...
newvalue
>>> assert 'newkey' not in os.environ
Keywords can be used in the `patch.dict` call to set values in the dictionary:
.. doctest::
>>> mymodule = MagicMock()
>>> mymodule.function.return_value = 'fish'
>>> with patch.dict('sys.modules', mymodule=mymodule):
... import mymodule
... mymodule.function('some', 'args')
...
'fish'
`patch.dict` can be used with dictionary like objects that aren't actually
dictionaries. At the very minimum they must support item getting, setting,
deleting and either iteration or membership test. This corresponds to the
magic methods `__getitem__`, `__setitem__`, `__delitem__` and either
`__iter__` or `__contains__`.
.. doctest::
>>> class Container(object):
... def __init__(self):
... self.values = {}
... def __getitem__(self, name):
... return self.values[name]
... def __setitem__(self, name, value):
... self.values[name] = value
... def __delitem__(self, name):
... del self.values[name]
... def __iter__(self):
... return iter(self.values)
...
>>> thing = Container()
>>> thing['one'] = 1
>>> with patch.dict(thing, one=2, two=3):
... assert thing['one'] == 2
... assert thing['two'] == 3
...
>>> assert thing['one'] == 1
>>> assert list(thing) == ['one']
patch.multiple
==============
.. function:: patch.multiple(target, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)
Perform multiple patches in a single call. It takes the object to be
patched (either as an object or a string to fetch the object by importing)
and keyword arguments for the patches::
with patch.multiple(settings, FIRST_PATCH='one', SECOND_PATCH='two'):
...
Use :data:`DEFAULT` as the value if you want `patch.multiple` to create
mocks for you. In this case the created mocks are passed into a decorated
function by keyword, and a dictionary is returned when `patch.multiple` is
used as a context manager.
`patch.multiple` can be used as a decorator, class decorator or a context
manager. The arguments `spec`, `spec_set`, `create`, `autospec` and
`new_callable` have the same meaning as for `patch`. These arguments will
be applied to *all* patches done by `patch.multiple`.
When used as a class decorator `patch.multiple` honours `patch.TEST_PREFIX`
for choosing which methods to wrap.
If you want `patch.multiple` to create mocks for you, then you can use
:data:`DEFAULT` as the value. If you use `patch.multiple` as a decorator
then the created mocks are passed into the decorated function by keyword.
.. doctest::
>>> thing = object()
>>> other = object()
>>> @patch.multiple('__main__', thing=DEFAULT, other=DEFAULT)
... def test_function(thing, other):
... assert isinstance(thing, MagicMock)
... assert isinstance(other, MagicMock)
...
>>> test_function()
`patch.multiple` can be nested with other `patch` decorators, but put arguments
passed by keyword *after* any of the standard arguments created by `patch`:
.. doctest::
>>> @patch('sys.exit')
... @patch.multiple('__main__', thing=DEFAULT, other=DEFAULT)
... def test_function(mock_exit, other, thing):
... assert 'other' in repr(other)
... assert 'thing' in repr(thing)
... assert 'exit' in repr(mock_exit)
...
>>> test_function()
If `patch.multiple` is used as a context manager, the value returned by the
context manger is a dictionary where created mocks are keyed by name:
.. doctest::
>>> with patch.multiple('__main__', thing=DEFAULT, other=DEFAULT) as values:
... assert 'other' in repr(values['other'])
... assert 'thing' in repr(values['thing'])
... assert values['thing'] is thing
... assert values['other'] is other
...
.. _start-and-stop:
patch methods: start and stop
=============================
All the patchers have `start` and `stop` methods. These make it simpler to do
patching in `setUp` methods or where you want to do multiple patches without
nesting decorators or with statements.
To use them call `patch`, `patch.object` or `patch.dict` as normal and keep a
reference to the returned `patcher` object. You can then call `start` to put
the patch in place and `stop` to undo it.
If you are using `patch` to create a mock for you then it will be returned by
the call to `patcher.start`.
.. doctest::
>>> patcher = patch('package.module.ClassName')
>>> from package import module
>>> original = module.ClassName
>>> new_mock = patcher.start()
>>> assert module.ClassName is not original
>>> assert module.ClassName is new_mock
>>> patcher.stop()
>>> assert module.ClassName is original
>>> assert module.ClassName is not new_mock
A typical use case for this might be for doing multiple patches in the `setUp`
method of a `TestCase`:
.. doctest::
>>> class MyTest(TestCase):
... def setUp(self):
... self.patcher1 = patch('package.module.Class1')
... self.patcher2 = patch('package.module.Class2')
... self.MockClass1 = self.patcher1.start()
... self.MockClass2 = self.patcher2.start()
...
... def tearDown(self):
... self.patcher1.stop()
... self.patcher2.stop()
...
... def test_something(self):
... assert package.module.Class1 is self.MockClass1
... assert package.module.Class2 is self.MockClass2
...
>>> MyTest('test_something').run()
.. caution::
If you use this technique you must ensure that the patching is "undone" by
calling `stop`. This can be fiddlier than you might think, because if an
exception is raised in the setUp then tearDown is not called. `unittest2
<http://pypi.python.org/pypi/unittest2>`_ cleanup functions make this
easier.
.. doctest::
>>> class MyTest(TestCase):
... def setUp(self):
... patcher = patch('package.module.Class')
... self.MockClass = patcher.start()
... self.addCleanup(patcher.stop)
...
... def test_something(self):
... assert package.module.Class is self.MockClass
...
>>> MyTest('test_something').run()
As an added bonus you no longer need to keep a reference to the `patcher`
object.
It is also possible to stop all patches which have been started by using
`patch.stopall`.
.. function:: patch.stopall
Stop all active patches. Only stops patches started with `start`.
TEST_PREFIX
===========
All of the patchers can be used as class decorators. When used in this way
they wrap every test method on the class. The patchers recognise methods that
start with `test` as being test methods. This is the same way that the
`unittest.TestLoader` finds test methods by default.
It is possible that you want to use a different prefix for your tests. You can
inform the patchers of the different prefix by setting `patch.TEST_PREFIX`:
.. doctest::
>>> patch.TEST_PREFIX = 'foo'
>>> value = 3
>>>
>>> @patch('__main__.value', 'not three')
... class Thing(object):
... def foo_one(self):
... print value
... def foo_two(self):
... print value
...
>>>
>>> Thing().foo_one()
not three
>>> Thing().foo_two()
not three
>>> value
3
Nesting Patch Decorators
========================
If you want to perform multiple patches then you can simply stack up the
decorators.
You can stack up multiple patch decorators using this pattern:
.. doctest::
>>> @patch.object(SomeClass, 'class_method')
... @patch.object(SomeClass, 'static_method')
... def test(mock1, mock2):
... assert SomeClass.static_method is mock1
... assert SomeClass.class_method is mock2
... SomeClass.static_method('foo')
... SomeClass.class_method('bar')
... return mock1, mock2
...
>>> mock1, mock2 = test()
>>> mock1.assert_called_once_with('foo')
>>> mock2.assert_called_once_with('bar')
Note that the decorators are applied from the bottom upwards. This is the
standard way that Python applies decorators. The order of the created mocks
passed into your test function matches this order.
Like all context-managers patches can be nested using contextlib's nested
function; *every* patching will appear in the tuple after "as":
.. doctest::
>>> from contextlib import nested
>>> with nested(
... patch('package.module.ClassName1'),
... patch('package.module.ClassName2')
... ) as (MockClass1, MockClass2):
... assert package.module.ClassName1 is MockClass1
... assert package.module.ClassName2 is MockClass2
...
.. _where-to-patch:
Where to patch
==============
`patch` works by (temporarily) changing the object that a *name* points to with
another one. There can be many names pointing to any individual object, so
for patching to work you must ensure that you patch the name used by the system
under test.
The basic principle is that you patch where an object is *looked up*, which
is not necessarily the same place as where it is defined. A couple of
examples will help to clarify this.
Imagine we have a project that we want to test with the following structure::
a.py
-> Defines SomeClass
b.py
-> from a import SomeClass
-> some_function instantiates SomeClass
Now we want to test `some_function` but we want to mock out `SomeClass` using
`patch`. The problem is that when we import module b, which we will have to
do then it imports `SomeClass` from module a. If we use `patch` to mock out
`a.SomeClass` then it will have no effect on our test; module b already has a
reference to the *real* `SomeClass` and it looks like our patching had no
effect.
The key is to patch out `SomeClass` where it is used (or where it is looked up
). In this case `some_function` will actually look up `SomeClass` in module b,
where we have imported it. The patching should look like:
`@patch('b.SomeClass')`
However, consider the alternative scenario where instead of `from a import
SomeClass` module b does `import a` and `some_function` uses `a.SomeClass`. Both
of these import forms are common. In this case the class we want to patch is
being looked up on the a module and so we have to patch `a.SomeClass` instead:
`@patch('a.SomeClass')`
Patching Descriptors and Proxy Objects
======================================
Since version 0.6.0 both patch_ and patch.object_ have been able to correctly
patch and restore descriptors: class methods, static methods and properties.
You should patch these on the *class* rather than an instance.
Since version 0.7.0 patch_ and patch.object_ work correctly with some objects
that proxy attribute access, like the `django setttings object
<http://www.voidspace.org.uk/python/weblog/arch_d7_2010_12_04.shtml#e1198>`_.
.. note::
In django `import settings` and `from django.conf import settings`
return different objects. If you are using libraries / apps that do both you
may have to patch both. Grrr...

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==========
Sentinel
==========
.. currentmodule:: mock
.. testsetup::
class ProductionClass(object):
def something(self):
return self.method()
class Test(unittest2.TestCase):
def testSomething(self):
pass
self = Test('testSomething')
.. data:: sentinel
The ``sentinel`` object provides a convenient way of providing unique
objects for your tests.
Attributes are created on demand when you access them by name. Accessing
the same attribute will always return the same object. The objects
returned have a sensible repr so that test failure messages are readable.
.. data:: DEFAULT
The `DEFAULT` object is a pre-created sentinel (actually
`sentinel.DEFAULT`). It can be used by :attr:`~Mock.side_effect`
functions to indicate that the normal return value should be used.
Sentinel Example
================
Sometimes when testing you need to test that a specific object is passed as an
argument to another method, or returned. It can be common to create named
sentinel objects to test this. `sentinel` provides a convenient way of
creating and testing the identity of objects like this.
In this example we monkey patch `method` to return
`sentinel.some_object`:
.. doctest::
>>> real = ProductionClass()
>>> real.method = Mock(name="method")
>>> real.method.return_value = sentinel.some_object
>>> result = real.method()
>>> assert result is sentinel.some_object
>>> sentinel.some_object
sentinel.some_object

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.. currentmodule:: mock
CHANGELOG
=========
2012/10/07 Version 1.0.0
------------------------
No changes since 1.0.0 beta 1. This version has feature parity with
`unittest.mock
<http://docs.python.org/py3k/library/unittest.mock.html#module-unittest.mock>`_
in Python 3.3.
Full list of changes since 0.8:
* `mocksignature`, along with the `mocksignature` argument to `patch`, removed
* Support for deleting attributes (accessing deleted attributes will raise an
`AttributeError`)
* Added the `mock_open` helper function for mocking the builtin `open`
* `__class__` is assignable, so a mock can pass an `isinstance` check without
requiring a spec
* Addition of `PropertyMock`, for mocking properties
* `MagicMocks` made unorderable by default (in Python 3). The comparison
methods (other than equality and inequality) now return `NotImplemented`
* Propagate traceback info to support subclassing of `_patch` by other
libraries
* `create_autospec` works with attributes present in results of `dir` that
can't be fetched from the object's class. Contributed by Konstantine Rybnikov
* Any exceptions in an iterable `side_effect` will be raised instead of
returned
* In Python 3, `create_autospec` now supports keyword only arguments
* Added `patch.stopall` method to stop all active patches created by `start`
* BUGFIX: calling `MagicMock.reset_mock` wouldn't reset magic method mocks
* BUGFIX: calling `reset_mock` on a `MagicMock` created with autospec could
raise an exception
* BUGFIX: passing multiple spec arguments to patchers (`spec` , `spec_set` and
`autospec`) had unpredictable results, now it is an error
* BUGFIX: using `spec=True` *and* `create=True` as arguments to patchers could
result in using `DEFAULT` as the spec. Now it is an error instead
* BUGFIX: using `spec` or `autospec` arguments to patchers, along with
`spec_set=True` did not work correctly
* BUGFIX: using an object that evaluates to False as a spec could be ignored
* BUGFIX: a list as the `spec` argument to a patcher would always result in a
non-callable mock. Now if `__call__` is in the spec the mock is callable
2012/07/13 Version 1.0.0 beta 1
--------------------------------
* Added `patch.stopall` method to stop all active patches created by `start`
* BUGFIX: calling `MagicMock.reset_mock` wouldn't reset magic method mocks
* BUGFIX: calling `reset_mock` on a `MagicMock` created with autospec could
raise an exception
2012/05/04 Version 1.0.0 alpha 2
--------------------------------
* `PropertyMock` attributes are now standard `MagicMocks`
* `create_autospec` works with attributes present in results of `dir` that
can't be fetched from the object's class. Contributed by Konstantine Rybnikov
* Any exceptions in an iterable `side_effect` will be raised instead of
returned
* In Python 3, `create_autospec` now supports keyword only arguments
2012/03/25 Version 1.0.0 alpha 1
--------------------------------
The standard library version!
* `mocksignature`, along with the `mocksignature` argument to `patch`, removed
* Support for deleting attributes (accessing deleted attributes will raise an
`AttributeError`)
* Added the `mock_open` helper function for mocking the builtin `open`
* `__class__` is assignable, so a mock can pass an `isinstance` check without
requiring a spec
* Addition of `PropertyMock`, for mocking properties
* `MagicMocks` made unorderable by default (in Python 3). The comparison
methods (other than equality and inequality) now return `NotImplemented`
* Propagate traceback info to support subclassing of `_patch` by other
libraries
* BUGFIX: passing multiple spec arguments to patchers (`spec` , `spec_set` and
`autospec`) had unpredictable results, now it is an error
* BUGFIX: using `spec=True` *and* `create=True` as arguments to patchers could
result in using `DEFAULT` as the spec. Now it is an error instead
* BUGFIX: using `spec` or `autospec` arguments to patchers, along with
`spec_set=True` did not work correctly
* BUGFIX: using an object that evaluates to False as a spec could be ignored
* BUGFIX: a list as the `spec` argument to a patcher would always result in a
non-callable mock. Now if `__call__` is in the spec the mock is callable
2012/02/13 Version 0.8.0
------------------------
The only changes since 0.8rc2 are:
* Improved repr of :data:`sentinel` objects
* :data:`ANY` can be used for comparisons against :data:`call` objects
* The return value of `MagicMock.__iter__` method can be set to
any iterable and isn't required to be an iterator
Full List of changes since 0.7:
mock 0.8.0 is the last version that will support Python 2.4.
* Addition of :attr:`~Mock.mock_calls` list for *all* calls (including magic
methods and chained calls)
* :func:`patch` and :func:`patch.object` now create a :class:`MagicMock`
instead of a :class:`Mock` by default
* The patchers (`patch`, `patch.object` and `patch.dict`), plus `Mock` and
`MagicMock`, take arbitrary keyword arguments for configuration
* New mock method :meth:`~Mock.configure_mock` for setting attributes and
return values / side effects on the mock and its attributes
* New mock assert methods :meth:`~Mock.assert_any_call` and
:meth:`~Mock.assert_has_calls`
* Implemented :ref:`auto-speccing` (recursive, lazy speccing of mocks with
mocked signatures for functions/methods), as the `autospec` argument to
`patch`
* Added the :func:`create_autospec` function for manually creating
'auto-specced' mocks
* :func:`patch.multiple` for doing multiple patches in a single call, using
keyword arguments
* Setting :attr:`~Mock.side_effect` to an iterable will cause calls to the mock
to return the next value from the iterable
* New `new_callable` argument to `patch` and `patch.object` allowing you to
pass in a class or callable object (instead of `MagicMock`) that will be
called to replace the object being patched
* Addition of :class:`NonCallableMock` and :class:`NonCallableMagicMock`, mocks
without a `__call__` method
* Addition of :meth:`~Mock.mock_add_spec` method for adding (or changing) a
spec on an existing mock
* Protocol methods on :class:`MagicMock` are magic mocks, and are created
lazily on first lookup. This means the result of calling a protocol method is
a `MagicMock` instead of a `Mock` as it was previously
* Addition of :meth:`~Mock.attach_mock` method
* Added :data:`ANY` for ignoring arguments in :meth:`~Mock.assert_called_with`
calls
* Addition of :data:`call` helper object
* Improved repr for mocks
* Improved repr for :attr:`Mock.call_args` and entries in
:attr:`Mock.call_args_list`, :attr:`Mock.method_calls` and
:attr:`Mock.mock_calls`
* Improved repr for :data:`sentinel` objects
* `patch` lookup is done at use time not at decoration time
* In Python 2.6 or more recent, `dir` on a mock will report all the dynamically
created attributes (or the full list of attributes if there is a spec) as
well as all the mock methods and attributes.
* Module level :data:`FILTER_DIR` added to control whether `dir(mock)` filters
private attributes. `True` by default.
* `patch.TEST_PREFIX` for controlling how patchers recognise test methods when
used to decorate a class
* Support for using Java exceptions as a :attr:`~Mock.side_effect` on Jython
* `Mock` call lists (`call_args_list`, `method_calls` & `mock_calls`) are now
custom list objects that allow membership tests for "sub lists" and have
a nicer representation if you `str` or `print` them
* Mocks attached as attributes or return values to other mocks have calls
recorded in `method_calls` and `mock_calls` of the parent (unless a name is
already set on the child)
* Improved failure messages for `assert_called_with` and
`assert_called_once_with`
* The return value of the :class:`MagicMock` `__iter__` method can be set to
any iterable and isn't required to be an iterator
* Added the Mock API (`assert_called_with` etc) to functions created by
:func:`mocksignature`
* Tuples as well as lists can be used to specify allowed methods for `spec` &
`spec_set` arguments
* Calling `stop` on an unstarted patcher fails with a more meaningful error
message
* Renamed the internal classes `Sentinel` and `SentinelObject` to prevent abuse
* BUGFIX: an error creating a patch, with nested patch decorators, won't leave
patches in place
* BUGFIX: `__truediv__` and `__rtruediv__` not available as magic methods on
mocks in Python 3
* BUGFIX: `assert_called_with` / `assert_called_once_with` can be used with
`self` as a keyword argument
* BUGFIX: when patching a class with an explicit spec / spec_set (not a
boolean) it applies "spec inheritance" to the return value of the created
mock (the "instance")
* BUGFIX: remove the `__unittest` marker causing traceback truncation
* Removal of deprecated `patch_object`
* Private attributes `_name`, `_methods`, '_children', `_wraps` and `_parent`
(etc) renamed to reduce likelihood of clash with user attributes.
* Added license file to the distribution
2012/01/10 Version 0.8.0 release candidate 2
--------------------------------------------
* Removed the `configure` keyword argument to `create_autospec` and allow
arbitrary keyword arguments (for the `Mock` constructor) instead
* Fixed `ANY` equality with some types in `assert_called_with` calls
* Switched to a standard Sphinx theme (compatible with
`readthedocs.org <http://mock.readthedocs.org>`_)
2011/12/29 Version 0.8.0 release candidate 1
--------------------------------------------
* `create_autospec` on the return value of a mocked class will use `__call__`
for the signature rather than `__init__`
* Performance improvement instantiating `Mock` and `MagicMock`
* Mocks used as magic methods have the same type as their parent instead of
being hardcoded to `MagicMock`
Special thanks to Julian Berman for his help with diagnosing and improving
performance in this release.
2011/10/09 Version 0.8.0 beta 4
-------------------------------
* `patch` lookup is done at use time not at decoration time
* When attaching a Mock to another Mock as a magic method, calls are recorded
in mock_calls
* Addition of `attach_mock` method
* Renamed the internal classes `Sentinel` and `SentinelObject` to prevent abuse
* BUGFIX: various issues around circular references with mocks (setting a mock
return value to be itself etc)
2011/08/15 Version 0.8.0 beta 3
-------------------------------
* Mocks attached as attributes or return values to other mocks have calls
recorded in `method_calls` and `mock_calls` of the parent (unless a name is
already set on the child)
* Addition of `mock_add_spec` method for adding (or changing) a spec on an
existing mock
* Improved repr for `Mock.call_args` and entries in `Mock.call_args_list`,
`Mock.method_calls` and `Mock.mock_calls`
* Improved repr for mocks
* BUGFIX: minor fixes in the way `mock_calls` is worked out,
especially for "intermediate" mocks in a call chain
2011/08/05 Version 0.8.0 beta 2
-------------------------------
* Setting `side_effect` to an iterable will cause calls to the mock to return
the next value from the iterable
* Added `assert_any_call` method
* Moved `assert_has_calls` from call lists onto mocks
* BUGFIX: `call_args` and all members of `call_args_list` are two tuples of
`(args, kwargs)` again instead of three tuples of `(name, args, kwargs)`
2011/07/25 Version 0.8.0 beta 1
-------------------------------
* `patch.TEST_PREFIX` for controlling how patchers recognise test methods when
used to decorate a class
* `Mock` call lists (`call_args_list`, `method_calls` & `mock_calls`) are now
custom list objects that allow membership tests for "sub lists" and have
an `assert_has_calls` method for unordered call checks
* `callargs` changed to *always* be a three-tuple of `(name, args, kwargs)`
* Addition of `mock_calls` list for *all* calls (including magic methods and
chained calls)
* Extension of `call` object to support chained calls and `callargs` for better
comparisons with or without names. `call` object has a `call_list` method for
chained calls
* Added the public `instance` argument to `create_autospec`
* Support for using Java exceptions as a `side_effect` on Jython
* Improved failure messages for `assert_called_with` and
`assert_called_once_with`
* Tuples as well as lists can be used to specify allowed methods for `spec` &
`spec_set` arguments
* BUGFIX: Fixed bug in `patch.multiple` for argument passing when creating
mocks
* Added license file to the distribution
2011/07/16 Version 0.8.0 alpha 2
--------------------------------
* `patch.multiple` for doing multiple patches in a single call, using keyword
arguments
* New `new_callable` argument to `patch` and `patch.object` allowing you to
pass in a class or callable object (instead of `MagicMock`) that will be
called to replace the object being patched
* Addition of `NonCallableMock` and `NonCallableMagicMock`, mocks without a
`__call__` method
* Mocks created by `patch` have a `MagicMock` as the `return_value` where a
class is being patched
* `create_autospec` can create non-callable mocks for non-callable objects.
`return_value` mocks of classes will be non-callable unless the class has
a `__call__` method
* `autospec` creates a `MagicMock` without a spec for properties and slot
descriptors, because we don't know the type of object they return
* Removed the "inherit" argument from `create_autospec`
* Calling `stop` on an unstarted patcher fails with a more meaningful error
message
* BUGFIX: an error creating a patch, with nested patch decorators, won't leave
patches in place
* BUGFIX: `__truediv__` and `__rtruediv__` not available as magic methods on
mocks in Python 3
* BUGFIX: `assert_called_with` / `assert_called_once_with` can be used with
`self` as a keyword argument
* BUGFIX: autospec for functions / methods with an argument named self that
isn't the first argument no longer broken
* BUGFIX: when patching a class with an explicit spec / spec_set (not a
boolean) it applies "spec inheritance" to the return value of the created
mock (the "instance")
* BUGFIX: remove the `__unittest` marker causing traceback truncation
2011/06/14 Version 0.8.0 alpha 1
--------------------------------
mock 0.8.0 is the last version that will support Python 2.4.
* The patchers (`patch`, `patch.object` and `patch.dict`), plus `Mock` and
`MagicMock`, take arbitrary keyword arguments for configuration
* New mock method `configure_mock` for setting attributes and return values /
side effects on the mock and its attributes
* In Python 2.6 or more recent, `dir` on a mock will report all the dynamically
created attributes (or the full list of attributes if there is a spec) as
well as all the mock methods and attributes.
* Module level `FILTER_DIR` added to control whether `dir(mock)` filters
private attributes. `True` by default. Note that `vars(Mock())` can still be
used to get all instance attributes and `dir(type(Mock())` will still return
all the other attributes (irrespective of `FILTER_DIR`)
* `patch` and `patch.object` now create a `MagicMock` instead of a `Mock` by
default
* Added `ANY` for ignoring arguments in `assert_called_with` calls
* Addition of `call` helper object
* Protocol methods on `MagicMock` are magic mocks, and are created lazily on
first lookup. This means the result of calling a protocol method is a
MagicMock instead of a Mock as it was previously
* Added the Mock API (`assert_called_with` etc) to functions created by
`mocksignature`
* Private attributes `_name`, `_methods`, '_children', `_wraps` and `_parent`
(etc) renamed to reduce likelihood of clash with user attributes.
* Implemented auto-speccing (recursive, lazy speccing of mocks with mocked
signatures for functions/methods)
Limitations:
- Doesn't mock magic methods or attributes (it creates MagicMocks, so the
magic methods are *there*, they just don't have the signature mocked nor
are attributes followed)
- Doesn't mock function / method attributes
- Uses object traversal on the objects being mocked to determine types - so
properties etc may be triggered
- The return value of mocked classes (the 'instance') has the same call
signature as the class __init__ (as they share the same spec)
You create auto-specced mocks by passing `autospec=True` to `patch`.
Note that attributes that are None are special cased and mocked without a
spec (so any attribute / method can be used). This is because None is
typically used as a default value for attributes that may be of some other
type, and as we don't know what type that may be we allow all access.
Note that the `autospec` option to `patch` obsoletes the `mocksignature`
option.
* Added the `create_autospec` function for manually creating 'auto-specced'
mocks
* Removal of deprecated `patch_object`
2011/05/30 Version 0.7.2
------------------------
* BUGFIX: instances of list subclasses can now be used as mock specs
* BUGFIX: MagicMock equality / inequality protocol methods changed to use the
default equality / inequality. This is done through a `side_effect` on
the mocks used for `__eq__` / `__ne__`
2011/05/06 Version 0.7.1
------------------------
Package fixes contributed by Michael Fladischer. No code changes.
* Include template in package
* Use isolated binaries for the tox tests
* Unset executable bit on docs
* Fix DOS line endings in getting-started.txt
2011/03/05 Version 0.7.0
------------------------
No API changes since 0.7.0 rc1. Many documentation changes including a stylish
new `Sphinx theme <https://github.com/coordt/ADCtheme/>`_.
The full set of changes since 0.6.0 are:
* Python 3 compatibility
* Ability to mock magic methods with `Mock` and addition of `MagicMock`
with pre-created magic methods
* Addition of `mocksignature` and `mocksignature` argument to `patch` and
`patch.object`
* Addition of `patch.dict` for changing dictionaries during a test
* Ability to use `patch`, `patch.object` and `patch.dict` as class decorators
* Renamed ``patch_object`` to `patch.object` (``patch_object`` is
deprecated)
* Addition of soft comparisons: `call_args`, `call_args_list` and `method_calls`
now return tuple-like objects which compare equal even when empty args
or kwargs are skipped
* patchers (`patch`, `patch.object` and `patch.dict`) have start and stop
methods
* Addition of `assert_called_once_with` method
* Mocks can now be named (`name` argument to constructor) and the name is used
in the repr
* repr of a mock with a spec includes the class name of the spec
* `assert_called_with` works with `python -OO`
* New `spec_set` keyword argument to `Mock` and `patch`. If used,
attempting to *set* an attribute on a mock not on the spec will raise an
`AttributeError`
* Mocks created with a spec can now pass `isinstance` tests (`__class__`
returns the type of the spec)
* Added docstrings to all objects
* Improved failure message for `Mock.assert_called_with` when the mock
has not been called at all
* Decorated functions / methods have their docstring and `__module__`
preserved on Python 2.4.
* BUGFIX: `mock.patch` now works correctly with certain types of objects that
proxy attribute access, like the django settings object
* BUGFIX: mocks are now copyable (thanks to Ned Batchelder for reporting and
diagnosing this)
* BUGFIX: `spec=True` works with old style classes
* BUGFIX: ``help(mock)`` works now (on the module). Can no longer use ``__bases__``
as a valid sentinel name (thanks to Stephen Emslie for reporting and
diagnosing this)
* BUGFIX: ``side_effect`` now works with ``BaseException`` exceptions like
``KeyboardInterrupt``
* BUGFIX: `reset_mock` caused infinite recursion when a mock is set as its own
return value
* BUGFIX: patching the same object twice now restores the patches correctly
* with statement tests now skipped on Python 2.4
* Tests require unittest2 (or unittest2-py3k) to run
* Tested with `tox <http://pypi.python.org/pypi/tox>`_ on Python 2.4 - 3.2,
jython and pypy (excluding 3.0)
* Added 'build_sphinx' command to setup.py (requires setuptools or distribute)
Thanks to Florian Bauer
* Switched from subversion to mercurial for source code control
* `Konrad Delong <http://konryd.blogspot.com/>`_ added as co-maintainer
2011/02/16 Version 0.7.0 RC 1
-----------------------------
Changes since beta 4:
* Tested with jython, pypy and Python 3.2 and 3.1
* Decorated functions / methods have their docstring and `__module__`
preserved on Python 2.4
* BUGFIX: `mock.patch` now works correctly with certain types of objects that
proxy attribute access, like the django settings object
* BUGFIX: `reset_mock` caused infinite recursion when a mock is set as its own
return value
2010/11/12 Version 0.7.0 beta 4
-------------------------------
* patchers (`patch`, `patch.object` and `patch.dict`) have start and stop
methods
* Addition of `assert_called_once_with` method
* repr of a mock with a spec includes the class name of the spec
* `assert_called_with` works with `python -OO`
* New `spec_set` keyword argument to `Mock` and `patch`. If used,
attempting to *set* an attribute on a mock not on the spec will raise an
`AttributeError`
* Attributes and return value of a `MagicMock` are `MagicMock` objects
* Attempting to set an unsupported magic method now raises an `AttributeError`
* `patch.dict` works as a class decorator
* Switched from subversion to mercurial for source code control
* BUGFIX: mocks are now copyable (thanks to Ned Batchelder for reporting and
diagnosing this)
* BUGFIX: `spec=True` works with old style classes
* BUGFIX: `mocksignature=True` can now patch instance methods via
`patch.object`
2010/09/18 Version 0.7.0 beta 3
-------------------------------
* Using spec with :class:`MagicMock` only pre-creates magic methods in the spec
* Setting a magic method on a mock with a ``spec`` can only be done if the
spec has that method
* Mocks can now be named (`name` argument to constructor) and the name is used
in the repr
* `mocksignature` can now be used with classes (signature based on `__init__`)
and callable objects (signature based on `__call__`)
* Mocks created with a spec can now pass `isinstance` tests (`__class__`
returns the type of the spec)
* Default numeric value for MagicMock is 1 rather than zero (because the
MagicMock bool defaults to True and 0 is False)
* Improved failure message for :meth:`~Mock.assert_called_with` when the mock
has not been called at all
* Adding the following to the set of supported magic methods:
- ``__getformat__`` and ``__setformat__``
- pickle methods
- ``__trunc__``, ``__ceil__`` and ``__floor__``
- ``__sizeof__``
* Added 'build_sphinx' command to setup.py (requires setuptools or distribute)
Thanks to Florian Bauer
* with statement tests now skipped on Python 2.4
* Tests require unittest2 to run on Python 2.7
* Improved several docstrings and documentation
2010/06/23 Version 0.7.0 beta 2
-------------------------------
* :func:`patch.dict` works as a context manager as well as a decorator
* ``patch.dict`` takes a string to specify dictionary as well as a dictionary
object. If a string is supplied the name specified is imported
* BUGFIX: ``patch.dict`` restores dictionary even when an exception is raised
2010/06/22 Version 0.7.0 beta 1
-------------------------------
* Addition of :func:`mocksignature`
* Ability to mock magic methods
* Ability to use ``patch`` and ``patch.object`` as class decorators
* Renamed ``patch_object`` to :func:`patch.object` (``patch_object`` is
deprecated)
* Addition of :class:`MagicMock` class with all magic methods pre-created for you
* Python 3 compatibility (tested with 3.2 but should work with 3.0 & 3.1 as
well)
* Addition of :func:`patch.dict` for changing dictionaries during a test
* Addition of ``mocksignature`` argument to ``patch`` and ``patch.object``
* ``help(mock)`` works now (on the module). Can no longer use ``__bases__``
as a valid sentinel name (thanks to Stephen Emslie for reporting and
diagnosing this)
* Addition of soft comparisons: `call_args`, `call_args_list` and `method_calls`
now return tuple-like objects which compare equal even when empty args
or kwargs are skipped
* Added docstrings.
* BUGFIX: ``side_effect`` now works with ``BaseException`` exceptions like
``KeyboardInterrupt``
* BUGFIX: patching the same object twice now restores the patches correctly
* The tests now require `unittest2 <http://pypi.python.org/pypi/unittest2>`_
to run
* `Konrad Delong <http://konryd.blogspot.com/>`_ added as co-maintainer
2009/08/22 Version 0.6.0
------------------------
* New test layout compatible with test discovery
* Descriptors (static methods / class methods etc) can now be patched and
restored correctly
* Mocks can raise exceptions when called by setting ``side_effect`` to an
exception class or instance
* Mocks that wrap objects will not pass on calls to the underlying object if
an explicit return_value is set
2009/04/17 Version 0.5.0
------------------------
* Made DEFAULT part of the public api.
* Documentation built with Sphinx.
* ``side_effect`` is now called with the same arguments as the mock is called with and
if returns a non-DEFAULT value that is automatically set as the ``mock.return_value``.
* ``wraps`` keyword argument used for wrapping objects (and passing calls through to the wrapped object).
* ``Mock.reset`` renamed to ``Mock.reset_mock``, as reset is a common API name.
* ``patch`` / ``patch_object`` are now context managers and can be used with ``with``.
* A new 'create' keyword argument to patch and patch_object that allows them to patch
(and unpatch) attributes that don't exist. (Potentially unsafe to use - it can allow
you to have tests that pass when they are testing an API that doesn't exist - use at
your own risk!)
* The methods keyword argument to Mock has been removed and merged with spec. The spec
argument can now be a list of methods or an object to take the spec from.
* Nested patches may now be applied in a different order (created mocks passed
in the opposite order). This is actually a bugfix.
* patch and patch_object now take a spec keyword argument. If spec is
passed in as 'True' then the Mock created will take the object it is replacing
as its spec object. If the object being replaced is a class, then the return
value for the mock will also use the class as a spec.
* A Mock created without a spec will not attempt to mock any magic methods / attributes
(they will raise an ``AttributeError`` instead).
2008/10/12 Version 0.4.0
------------------------
* Default return value is now a new mock rather than None
* return_value added as a keyword argument to the constructor
* New method 'assert_called_with'
* Added 'side_effect' attribute / keyword argument called when mock is called
* patch decorator split into two decorators:
- ``patch_object`` which takes an object and an attribute name to patch
(plus optionally a value to patch with which defaults to a mock object)
- ``patch`` which takes a string specifying a target to patch; in the form
'package.module.Class.attribute'. (plus optionally a value to
patch with which defaults to a mock object)
* Can now patch objects with ``None``
* Change to patch for nose compatibility with error reporting in wrapped functions
* Reset no longer clears children / return value etc - it just resets
call count and call args. It also calls reset on all children (and
the return value if it is a mock).
Thanks to Konrad Delong, Kevin Dangoor and others for patches and suggestions.
2007/12/03 Version 0.3.1
-------------------------
``patch`` maintains the name of decorated functions for compatibility with nose
test autodiscovery.
Tests decorated with ``patch`` that use the two argument form (implicit mock
creation) will receive the mock(s) passed in as extra arguments.
Thanks to Kevin Dangoor for these changes.
2007/11/30 Version 0.3.0
-------------------------
Removed ``patch_module``. ``patch`` can now take a string as the first
argument for patching modules.
The third argument to ``patch`` is optional - a mock will be created by
default if it is not passed in.
2007/11/21 Version 0.2.1
-------------------------
Bug fix, allows reuse of functions decorated with ``patch`` and ``patch_module``.
2007/11/20 Version 0.2.0
-------------------------
Added ``spec`` keyword argument for creating ``Mock`` objects from a
specification object.
Added ``patch`` and ``patch_module`` monkey patching decorators.
Added ``sentinel`` for convenient access to unique objects.
Distribution includes unit tests.
2007/11/19 Version 0.1.0
-------------------------
Initial release.
TODO and Limitations
====================
Contributions, bug reports and comments welcomed!
Feature requests and bug reports are handled on the issue tracker:
* `mock issue tracker <http://code.google.com/p/mock/issues/list>`_
`wraps` is not integrated with magic methods.
`patch` could auto-do the patching in the constructor and unpatch in the
destructor. This would be useful in itself, but violates TOOWTDI and would be
unsafe for IronPython & PyPy (non-deterministic calling of destructors).
Destructors aren't called in CPython where there are cycles, but a weak
reference with a callback can be used to get round this.
`Mock` has several attributes. This makes it unsuitable for mocking objects
that use these attribute names. A way round this would be to provide methods
that *hide* these attributes when needed. In 0.8 many, but not all, of these
attributes are renamed to gain a `_mock` prefix, making it less likely that
they will clash. Any outstanding attributes that haven't been modified with
the prefix should be changed.
If a patch is started using `patch.start` and then not stopped correctly then
the unpatching is not done. Using weak references it would be possible to
detect and fix this when the patch object itself is garbage collected. This
would be tricky to get right though.
When a `Mock` is created by `patch`, arbitrary keywords can be used to set
attributes. If `patch` is created with a `spec`, and is replacing a class, then
a `return_value` mock is created. The keyword arguments are not applied to the
child mock, but could be.
When mocking a class with `patch`, passing in `spec=True` or `autospec=True`,
the mock class has an instance created from the same spec. Should this be the
default behaviour for mocks anyway (mock return values inheriting the spec
from their parent), or should it be controlled by an additional keyword
argument (`inherit`) to the Mock constructor? `create_autospec` does this, so
an additional keyword argument to Mock is probably unnecessary.
The `mocksignature` argument to `patch` with a non `Mock` passed into
`new_callable` will *probably* cause an error. Should it just be invalid?
Note that `NonCallableMock` and `NonCallableMagicMock` still have the unused
(and unusable) attributes: `return_value`, `side_effect`, `call_count`,
`call_args` and `call_args_list`. These could be removed or raise errors on
getting / setting. They also have the `assert_called_with` and
`assert_called_once_with` methods. Removing these would be pointless as
fetching them would create a mock (attribute) that could be called without
error.
Some outstanding technical debt. The way autospeccing mocks function
signatures was copied and modified from `mocksignature`. This could all be
refactored into one set of functions instead of two. The way we tell if
patchers are started and if a patcher is being used for a `patch.multiple`
call are both horrible. There are now a host of helper functions that should
be rationalised. (Probably time to split mock into a package instead of a
module.)
Passing arbitrary keyword arguments to `create_autospec`, or `patch` with
`autospec`, when mocking a *function* works fine. However, the arbitrary
attributes are set on the created mock - but `create_autospec` returns a
real function (which doesn't have those attributes). However, what is the use
case for using autospec to create functions with attributes that don't exist
on the original?
`mocksignature`, plus the `call_args_list` and `method_calls` attributes of
`Mock` could all be deprecated.

628
third_party/python/mock-1.0.0/html/_sources/compare.txt поставляемый
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@ -1,628 +0,0 @@
=========================
Mock Library Comparison
=========================
.. testsetup::
def assertEqual(a, b):
assert a == b, ("%r != %r" % (a, b))
def assertRaises(Exc, func):
try:
func()
except Exc:
return
assert False, ("%s not raised" % Exc)
sys.modules['somemodule'] = somemodule = mock.Mock(name='somemodule')
class SomeException(Exception):
some_method = method1 = method2 = None
some_other_object = SomeObject = SomeException
A side-by-side comparison of how to accomplish some basic tasks with mock and
some other popular Python mocking libraries and frameworks.
These are:
* `flexmock <http://pypi.python.org/pypi/flexmock>`_
* `mox <http://pypi.python.org/pypi/mox>`_
* `Mocker <http://niemeyer.net/mocker>`_
* `dingus <http://pypi.python.org/pypi/dingus>`_
* `fudge <http://pypi.python.org/pypi/fudge>`_
Popular python mocking frameworks not yet represented here include
`MiniMock <http://pypi.python.org/pypi/MiniMock>`_.
`pMock <http://pmock.sourceforge.net/>`_ (last release 2004 and doesn't import
in recent versions of Python) and
`python-mock <http://python-mock.sourceforge.net/>`_ (last release 2005) are
intentionally omitted.
.. note::
A more up to date, and tested for all mock libraries (only the mock
examples on this page can be executed as doctests) version of this
comparison is maintained by Gary Bernhardt:
* `Python Mock Library Comparison
<http://garybernhardt.github.com/python-mock-comparison/>`_
This comparison is by no means complete, and also may not be fully idiomatic
for all the libraries represented. *Please* contribute corrections, missing
comparisons, or comparisons for additional libraries to the `mock issue
tracker <https://code.google.com/p/mock/issues/list>`_.
This comparison page was originally created by the `Mox project
<https://code.google.com/p/pymox/wiki/MoxComparison>`_ and then extended for
`flexmock and mock <http://has207.github.com/flexmock/compare.html>`_ by
Herman Sheremetyev. Dingus examples written by `Gary Bernhadt
<http://garybernhardt.github.com/python-mock-comparison/>`_. fudge examples
provided by `Kumar McMillan <http://farmdev.com/>`_.
.. note::
The examples tasks here were originally created by Mox which is a mocking
*framework* rather than a library like mock. The tasks shown naturally
exemplify tasks that frameworks are good at and not the ones they make
harder. In particular you can take a `Mock` or `MagicMock` object and use
it in any way you want with no up-front configuration. The same is also
true for Dingus.
The examples for mock here assume version 0.7.0.
Simple fake object
~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> my_mock.some_method.return_value = "calculated value"
>>> my_mock.some_attribute = "value"
>>> assertEqual("calculated value", my_mock.some_method())
>>> assertEqual("value", my_mock.some_attribute)
::
# Flexmock
mock = flexmock(some_method=lambda: "calculated value", some_attribute="value")
assertEqual("calculated value", mock.some_method())
assertEqual("value", mock.some_attribute)
# Mox
mock = mox.MockAnything()
mock.some_method().AndReturn("calculated value")
mock.some_attribute = "value"
mox.Replay(mock)
assertEqual("calculated value", mock.some_method())
assertEqual("value", mock.some_attribute)
# Mocker
mock = mocker.mock()
mock.some_method()
mocker.result("calculated value")
mocker.replay()
mock.some_attribute = "value"
assertEqual("calculated value", mock.some_method())
assertEqual("value", mock.some_attribute)
::
>>> # Dingus
>>> my_dingus = dingus.Dingus(some_attribute="value",
... some_method__returns="calculated value")
>>> assertEqual("calculated value", my_dingus.some_method())
>>> assertEqual("value", my_dingus.some_attribute)
::
>>> # fudge
>>> my_fake = (fudge.Fake()
... .provides('some_method')
... .returns("calculated value")
... .has_attr(some_attribute="value"))
...
>>> assertEqual("calculated value", my_fake.some_method())
>>> assertEqual("value", my_fake.some_attribute)
Simple mock
~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> my_mock.some_method.return_value = "value"
>>> assertEqual("value", my_mock.some_method())
>>> my_mock.some_method.assert_called_once_with()
::
# Flexmock
mock = flexmock()
mock.should_receive("some_method").and_return("value").once
assertEqual("value", mock.some_method())
# Mox
mock = mox.MockAnything()
mock.some_method().AndReturn("value")
mox.Replay(mock)
assertEqual("value", mock.some_method())
mox.Verify(mock)
# Mocker
mock = mocker.mock()
mock.some_method()
mocker.result("value")
mocker.replay()
assertEqual("value", mock.some_method())
mocker.verify()
::
>>> # Dingus
>>> my_dingus = dingus.Dingus(some_method__returns="value")
>>> assertEqual("value", my_dingus.some_method())
>>> assert my_dingus.some_method.calls().once()
::
>>> # fudge
>>> @fudge.test
... def test():
... my_fake = (fudge.Fake()
... .expects('some_method')
... .returns("value")
... .times_called(1))
...
>>> test()
Traceback (most recent call last):
...
AssertionError: fake:my_fake.some_method() was not called
Creating partial mocks
~~~~~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> SomeObject.some_method = mock.Mock(return_value='value')
>>> assertEqual("value", SomeObject.some_method())
::
# Flexmock
flexmock(SomeObject).should_receive("some_method").and_return('value')
assertEqual("value", mock.some_method())
# Mox
mock = mox.MockObject(SomeObject)
mock.some_method().AndReturn("value")
mox.Replay(mock)
assertEqual("value", mock.some_method())
mox.Verify(mock)
# Mocker
mock = mocker.mock(SomeObject)
mock.Get()
mocker.result("value")
mocker.replay()
assertEqual("value", mock.some_method())
mocker.verify()
::
>>> # Dingus
>>> object = SomeObject
>>> object.some_method = dingus.Dingus(return_value="value")
>>> assertEqual("value", object.some_method())
::
>>> # fudge
>>> fake = fudge.Fake().is_callable().returns("<fudge-value>")
>>> with fudge.patched_context(SomeObject, 'some_method', fake):
... s = SomeObject()
... assertEqual("<fudge-value>", s.some_method())
...
Ensure calls are made in specific order
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock(spec=SomeObject)
>>> my_mock.method1()
<Mock name='mock.method1()' id='...'>
>>> my_mock.method2()
<Mock name='mock.method2()' id='...'>
>>> assertEqual(my_mock.mock_calls, [call.method1(), call.method2()])
::
# Flexmock
mock = flexmock(SomeObject)
mock.should_receive('method1').once.ordered.and_return('first thing')
mock.should_receive('method2').once.ordered.and_return('second thing')
# Mox
mock = mox.MockObject(SomeObject)
mock.method1().AndReturn('first thing')
mock.method2().AndReturn('second thing')
mox.Replay(mock)
mox.Verify(mock)
# Mocker
mock = mocker.mock()
with mocker.order():
mock.method1()
mocker.result('first thing')
mock.method2()
mocker.result('second thing')
mocker.replay()
mocker.verify()
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> my_dingus.method1()
<Dingus ...>
>>> my_dingus.method2()
<Dingus ...>
>>> assertEqual(['method1', 'method2'], [call.name for call in my_dingus.calls])
::
>>> # fudge
>>> @fudge.test
... def test():
... my_fake = (fudge.Fake()
... .remember_order()
... .expects('method1')
... .expects('method2'))
... my_fake.method2()
... my_fake.method1()
...
>>> test()
Traceback (most recent call last):
...
AssertionError: Call #1 was fake:my_fake.method2(); Expected: #1 fake:my_fake.method1(), #2 fake:my_fake.method2(), end
Raising exceptions
~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> my_mock.some_method.side_effect = SomeException("message")
>>> assertRaises(SomeException, my_mock.some_method)
::
# Flexmock
mock = flexmock()
mock.should_receive("some_method").and_raise(SomeException("message"))
assertRaises(SomeException, mock.some_method)
# Mox
mock = mox.MockAnything()
mock.some_method().AndRaise(SomeException("message"))
mox.Replay(mock)
assertRaises(SomeException, mock.some_method)
mox.Verify(mock)
# Mocker
mock = mocker.mock()
mock.some_method()
mocker.throw(SomeException("message"))
mocker.replay()
assertRaises(SomeException, mock.some_method)
mocker.verify()
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> my_dingus.some_method = dingus.exception_raiser(SomeException)
>>> assertRaises(SomeException, my_dingus.some_method)
::
>>> # fudge
>>> my_fake = (fudge.Fake()
... .is_callable()
... .raises(SomeException("message")))
...
>>> my_fake()
Traceback (most recent call last):
...
SomeException: message
Override new instances of a class
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> with mock.patch('somemodule.Someclass') as MockClass:
... MockClass.return_value = some_other_object
... assertEqual(some_other_object, somemodule.Someclass())
...
::
# Flexmock
flexmock(some_module.SomeClass, new_instances=some_other_object)
assertEqual(some_other_object, some_module.SomeClass())
# Mox
# (you will probably have mox.Mox() available as self.mox in a real test)
mox.Mox().StubOutWithMock(some_module, 'SomeClass', use_mock_anything=True)
some_module.SomeClass().AndReturn(some_other_object)
mox.ReplayAll()
assertEqual(some_other_object, some_module.SomeClass())
# Mocker
instance = mocker.mock()
klass = mocker.replace(SomeClass, spec=None)
klass('expected', 'args')
mocker.result(instance)
::
>>> # Dingus
>>> MockClass = dingus.Dingus(return_value=some_other_object)
>>> with dingus.patch('somemodule.SomeClass', MockClass):
... assertEqual(some_other_object, somemodule.SomeClass())
...
::
>>> # fudge
>>> @fudge.patch('somemodule.SomeClass')
... def test(FakeClass):
... FakeClass.is_callable().returns(some_other_object)
... assertEqual(some_other_object, somemodule.SomeClass())
...
>>> test()
Call the same method multiple times
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. note::
You don't need to do *any* configuration to call `mock.Mock()` methods
multiple times. Attributes like `call_count`, `call_args_list` and
`method_calls` provide various different ways of making assertions about
how the mock was used.
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> my_mock.some_method()
<Mock name='mock.some_method()' id='...'>
>>> my_mock.some_method()
<Mock name='mock.some_method()' id='...'>
>>> assert my_mock.some_method.call_count >= 2
::
# Flexmock # (verifies that the method gets called at least twice)
flexmock(some_object).should_receive('some_method').at_least.twice
# Mox
# (does not support variable number of calls, so you need to create a new entry for each explicit call)
mock = mox.MockObject(some_object)
mock.some_method(mox.IgnoreArg(), mox.IgnoreArg())
mock.some_method(mox.IgnoreArg(), mox.IgnoreArg())
mox.Replay(mock)
mox.Verify(mock)
# Mocker
# (TODO)
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> my_dingus.some_method()
<Dingus ...>
>>> my_dingus.some_method()
<Dingus ...>
>>> assert len(my_dingus.calls('some_method')) == 2
::
>>> # fudge
>>> @fudge.test
... def test():
... my_fake = fudge.Fake().expects('some_method').times_called(2)
... my_fake.some_method()
...
>>> test()
Traceback (most recent call last):
...
AssertionError: fake:my_fake.some_method() was called 1 time(s). Expected 2.
Mock chained methods
~~~~~~~~~~~~~~~~~~~~
.. doctest::
>>> # mock
>>> my_mock = mock.Mock()
>>> method3 = my_mock.method1.return_value.method2.return_value.method3
>>> method3.return_value = 'some value'
>>> assertEqual('some value', my_mock.method1().method2().method3(1, 2))
>>> method3.assert_called_once_with(1, 2)
::
# Flexmock
# (intermediate method calls are automatically assigned to temporary fake objects
# and can be called with any arguments)
flexmock(some_object).should_receive(
'method1.method2.method3'
).with_args(arg1, arg2).and_return('some value')
assertEqual('some_value', some_object.method1().method2().method3(arg1, arg2))
::
# Mox
mock = mox.MockObject(some_object)
mock2 = mox.MockAnything()
mock3 = mox.MockAnything()
mock.method1().AndReturn(mock1)
mock2.method2().AndReturn(mock2)
mock3.method3(arg1, arg2).AndReturn('some_value')
self.mox.ReplayAll()
assertEqual("some_value", some_object.method1().method2().method3(arg1, arg2))
self.mox.VerifyAll()
# Mocker
# (TODO)
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> method3 = my_dingus.method1.return_value.method2.return_value.method3
>>> method3.return_value = 'some value'
>>> assertEqual('some value', my_dingus.method1().method2().method3(1, 2))
>>> assert method3.calls('()', 1, 2).once()
::
>>> # fudge
>>> @fudge.test
... def test():
... my_fake = fudge.Fake()
... (my_fake
... .expects('method1')
... .returns_fake()
... .expects('method2')
... .returns_fake()
... .expects('method3')
... .with_args(1, 2)
... .returns('some value'))
... assertEqual('some value', my_fake.method1().method2().method3(1, 2))
...
>>> test()
Mocking a context manager
~~~~~~~~~~~~~~~~~~~~~~~~~
Examples for mock, Dingus and fudge only (so far):
.. doctest::
>>> # mock
>>> my_mock = mock.MagicMock()
>>> with my_mock:
... pass
...
>>> my_mock.__enter__.assert_called_with()
>>> my_mock.__exit__.assert_called_with(None, None, None)
::
>>> # Dingus (nothing special here; all dinguses are "magic mocks")
>>> my_dingus = dingus.Dingus()
>>> with my_dingus:
... pass
...
>>> assert my_dingus.__enter__.calls()
>>> assert my_dingus.__exit__.calls('()', None, None, None)
::
>>> # fudge
>>> my_fake = fudge.Fake().provides('__enter__').provides('__exit__')
>>> with my_fake:
... pass
...
Mocking the builtin open used as a context manager
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Example for mock only (so far):
.. doctest::
>>> # mock
>>> my_mock = mock.MagicMock()
>>> with mock.patch('__builtin__.open', my_mock):
... manager = my_mock.return_value.__enter__.return_value
... manager.read.return_value = 'some data'
... with open('foo') as h:
... data = h.read()
...
>>> data
'some data'
>>> my_mock.assert_called_once_with('foo')
*or*:
.. doctest::
>>> # mock
>>> with mock.patch('__builtin__.open') as my_mock:
... my_mock.return_value.__enter__ = lambda s: s
... my_mock.return_value.__exit__ = mock.Mock()
... my_mock.return_value.read.return_value = 'some data'
... with open('foo') as h:
... data = h.read()
...
>>> data
'some data'
>>> my_mock.assert_called_once_with('foo')
::
>>> # Dingus
>>> my_dingus = dingus.Dingus()
>>> with dingus.patch('__builtin__.open', my_dingus):
... file_ = open.return_value.__enter__.return_value
... file_.read.return_value = 'some data'
... with open('foo') as h:
... data = f.read()
...
>>> data
'some data'
>>> assert my_dingus.calls('()', 'foo').once()
::
>>> # fudge
>>> from contextlib import contextmanager
>>> from StringIO import StringIO
>>> @contextmanager
... def fake_file(filename):
... yield StringIO('sekrets')
...
>>> with fudge.patch('__builtin__.open') as fake_open:
... fake_open.is_callable().calls(fake_file)
... with open('/etc/password') as f:
... data = f.read()
...
fake:__builtin__.open
>>> data
'sekrets'

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===========================
Getting Started with Mock
===========================
.. _getting-started:
.. index:: Getting Started
.. testsetup::
class SomeClass(object):
static_method = None
class_method = None
attribute = None
sys.modules['package'] = package = Mock(name='package')
sys.modules['package.module'] = module = package.module
sys.modules['module'] = package.module
Using Mock
==========
Mock Patching Methods
---------------------
Common uses for :class:`Mock` objects include:
* Patching methods
* Recording method calls on objects
You might want to replace a method on an object to check that
it is called with the correct arguments by another part of the system:
.. doctest::
>>> real = SomeClass()
>>> real.method = MagicMock(name='method')
>>> real.method(3, 4, 5, key='value')
<MagicMock name='method()' id='...'>
Once our mock has been used (`real.method` in this example) it has methods
and attributes that allow you to make assertions about how it has been used.
.. note::
In most of these examples the :class:`Mock` and :class:`MagicMock` classes
are interchangeable. As the `MagicMock` is the more capable class it makes
a sensible one to use by default.
Once the mock has been called its :attr:`~Mock.called` attribute is set to
`True`. More importantly we can use the :meth:`~Mock.assert_called_with` or
:meth:`~Mock.assert_called_once_with` method to check that it was called with
the correct arguments.
This example tests that calling `ProductionClass().method` results in a call to
the `something` method:
.. doctest::
>>> from mock import MagicMock
>>> class ProductionClass(object):
... def method(self):
... self.something(1, 2, 3)
... def something(self, a, b, c):
... pass
...
>>> real = ProductionClass()
>>> real.something = MagicMock()
>>> real.method()
>>> real.something.assert_called_once_with(1, 2, 3)
Mock for Method Calls on an Object
----------------------------------
In the last example we patched a method directly on an object to check that it
was called correctly. Another common use case is to pass an object into a
method (or some part of the system under test) and then check that it is used
in the correct way.
The simple `ProductionClass` below has a `closer` method. If it is called with
an object then it calls `close` on it.
.. doctest::
>>> class ProductionClass(object):
... def closer(self, something):
... something.close()
...
So to test it we need to pass in an object with a `close` method and check
that it was called correctly.
.. doctest::
>>> real = ProductionClass()
>>> mock = Mock()
>>> real.closer(mock)
>>> mock.close.assert_called_with()
We don't have to do any work to provide the 'close' method on our mock.
Accessing close creates it. So, if 'close' hasn't already been called then
accessing it in the test will create it, but :meth:`~Mock.assert_called_with`
will raise a failure exception.
Mocking Classes
---------------
A common use case is to mock out classes instantiated by your code under test.
When you patch a class, then that class is replaced with a mock. Instances
are created by *calling the class*. This means you access the "mock instance"
by looking at the return value of the mocked class.
In the example below we have a function `some_function` that instantiates `Foo`
and calls a method on it. The call to `patch` replaces the class `Foo` with a
mock. The `Foo` instance is the result of calling the mock, so it is configured
by modifying the mock :attr:`~Mock.return_value`.
.. doctest::
>>> def some_function():
... instance = module.Foo()
... return instance.method()
...
>>> with patch('module.Foo') as mock:
... instance = mock.return_value
... instance.method.return_value = 'the result'
... result = some_function()
... assert result == 'the result'
Naming your mocks
-----------------
It can be useful to give your mocks a name. The name is shown in the repr of
the mock and can be helpful when the mock appears in test failure messages. The
name is also propagated to attributes or methods of the mock:
.. doctest::
>>> mock = MagicMock(name='foo')
>>> mock
<MagicMock name='foo' id='...'>
>>> mock.method
<MagicMock name='foo.method' id='...'>
Tracking all Calls
------------------
Often you want to track more than a single call to a method. The
:attr:`~Mock.mock_calls` attribute records all calls
to child attributes of the mock - and also to their children.
.. doctest::
>>> mock = MagicMock()
>>> mock.method()
<MagicMock name='mock.method()' id='...'>
>>> mock.attribute.method(10, x=53)
<MagicMock name='mock.attribute.method()' id='...'>
>>> mock.mock_calls
[call.method(), call.attribute.method(10, x=53)]
If you make an assertion about `mock_calls` and any unexpected methods
have been called, then the assertion will fail. This is useful because as well
as asserting that the calls you expected have been made, you are also checking
that they were made in the right order and with no additional calls:
You use the :data:`call` object to construct lists for comparing with
`mock_calls`:
.. doctest::
>>> expected = [call.method(), call.attribute.method(10, x=53)]
>>> mock.mock_calls == expected
True
Setting Return Values and Attributes
------------------------------------
Setting the return values on a mock object is trivially easy:
.. doctest::
>>> mock = Mock()
>>> mock.return_value = 3
>>> mock()
3
Of course you can do the same for methods on the mock:
.. doctest::
>>> mock = Mock()
>>> mock.method.return_value = 3
>>> mock.method()
3
The return value can also be set in the constructor:
.. doctest::
>>> mock = Mock(return_value=3)
>>> mock()
3
If you need an attribute setting on your mock, just do it:
.. doctest::
>>> mock = Mock()
>>> mock.x = 3
>>> mock.x
3
Sometimes you want to mock up a more complex situation, like for example
`mock.connection.cursor().execute("SELECT 1")`. If we wanted this call to
return a list, then we have to configure the result of the nested call.
We can use :data:`call` to construct the set of calls in a "chained call" like
this for easy assertion afterwards:
.. doctest::
>>> mock = Mock()
>>> cursor = mock.connection.cursor.return_value
>>> cursor.execute.return_value = ['foo']
>>> mock.connection.cursor().execute("SELECT 1")
['foo']
>>> expected = call.connection.cursor().execute("SELECT 1").call_list()
>>> mock.mock_calls
[call.connection.cursor(), call.connection.cursor().execute('SELECT 1')]
>>> mock.mock_calls == expected
True
It is the call to `.call_list()` that turns our call object into a list of
calls representing the chained calls.
Raising exceptions with mocks
-----------------------------
A useful attribute is :attr:`~Mock.side_effect`. If you set this to an
exception class or instance then the exception will be raised when the mock
is called.
.. doctest::
>>> mock = Mock(side_effect=Exception('Boom!'))
>>> mock()
Traceback (most recent call last):
...
Exception: Boom!
Side effect functions and iterables
-----------------------------------
`side_effect` can also be set to a function or an iterable. The use case for
`side_effect` as an iterable is where your mock is going to be called several
times, and you want each call to return a different value. When you set
`side_effect` to an iterable every call to the mock returns the next value
from the iterable:
.. doctest::
>>> mock = MagicMock(side_effect=[4, 5, 6])
>>> mock()
4
>>> mock()
5
>>> mock()
6
For more advanced use cases, like dynamically varying the return values
depending on what the mock is called with, `side_effect` can be a function.
The function will be called with the same arguments as the mock. Whatever the
function returns is what the call returns:
.. doctest::
>>> vals = {(1, 2): 1, (2, 3): 2}
>>> def side_effect(*args):
... return vals[args]
...
>>> mock = MagicMock(side_effect=side_effect)
>>> mock(1, 2)
1
>>> mock(2, 3)
2
Creating a Mock from an Existing Object
---------------------------------------
One problem with over use of mocking is that it couples your tests to the
implementation of your mocks rather than your real code. Suppose you have a
class that implements `some_method`. In a test for another class, you
provide a mock of this object that *also* provides `some_method`. If later
you refactor the first class, so that it no longer has `some_method` - then
your tests will continue to pass even though your code is now broken!
`Mock` allows you to provide an object as a specification for the mock,
using the `spec` keyword argument. Accessing methods / attributes on the
mock that don't exist on your specification object will immediately raise an
attribute error. If you change the implementation of your specification, then
tests that use that class will start failing immediately without you having to
instantiate the class in those tests.
.. doctest::
>>> mock = Mock(spec=SomeClass)
>>> mock.old_method()
Traceback (most recent call last):
...
AttributeError: object has no attribute 'old_method'
If you want a stronger form of specification that prevents the setting
of arbitrary attributes as well as the getting of them then you can use
`spec_set` instead of `spec`.
Patch Decorators
================
.. note::
With `patch` it matters that you patch objects in the namespace where they
are looked up. This is normally straightforward, but for a quick guide
read :ref:`where to patch <where-to-patch>`.
A common need in tests is to patch a class attribute or a module attribute,
for example patching a builtin or patching a class in a module to test that it
is instantiated. Modules and classes are effectively global, so patching on
them has to be undone after the test or the patch will persist into other
tests and cause hard to diagnose problems.
mock provides three convenient decorators for this: `patch`, `patch.object` and
`patch.dict`. `patch` takes a single string, of the form
`package.module.Class.attribute` to specify the attribute you are patching. It
also optionally takes a value that you want the attribute (or class or
whatever) to be replaced with. 'patch.object' takes an object and the name of
the attribute you would like patched, plus optionally the value to patch it
with.
`patch.object`:
.. doctest::
>>> original = SomeClass.attribute
>>> @patch.object(SomeClass, 'attribute', sentinel.attribute)
... def test():
... assert SomeClass.attribute == sentinel.attribute
...
>>> test()
>>> assert SomeClass.attribute == original
>>> @patch('package.module.attribute', sentinel.attribute)
... def test():
... from package.module import attribute
... assert attribute is sentinel.attribute
...
>>> test()
If you are patching a module (including `__builtin__`) then use `patch`
instead of `patch.object`:
.. doctest::
>>> mock = MagicMock(return_value = sentinel.file_handle)
>>> with patch('__builtin__.open', mock):
... handle = open('filename', 'r')
...
>>> mock.assert_called_with('filename', 'r')
>>> assert handle == sentinel.file_handle, "incorrect file handle returned"
The module name can be 'dotted', in the form `package.module` if needed:
.. doctest::
>>> @patch('package.module.ClassName.attribute', sentinel.attribute)
... def test():
... from package.module import ClassName
... assert ClassName.attribute == sentinel.attribute
...
>>> test()
A nice pattern is to actually decorate test methods themselves:
.. doctest::
>>> class MyTest(unittest2.TestCase):
... @patch.object(SomeClass, 'attribute', sentinel.attribute)
... def test_something(self):
... self.assertEqual(SomeClass.attribute, sentinel.attribute)
...
>>> original = SomeClass.attribute
>>> MyTest('test_something').test_something()
>>> assert SomeClass.attribute == original
If you want to patch with a Mock, you can use `patch` with only one argument
(or `patch.object` with two arguments). The mock will be created for you and
passed into the test function / method:
.. doctest::
>>> class MyTest(unittest2.TestCase):
... @patch.object(SomeClass, 'static_method')
... def test_something(self, mock_method):
... SomeClass.static_method()
... mock_method.assert_called_with()
...
>>> MyTest('test_something').test_something()
You can stack up multiple patch decorators using this pattern:
.. doctest::
>>> class MyTest(unittest2.TestCase):
... @patch('package.module.ClassName1')
... @patch('package.module.ClassName2')
... def test_something(self, MockClass2, MockClass1):
... self.assertTrue(package.module.ClassName1 is MockClass1)
... self.assertTrue(package.module.ClassName2 is MockClass2)
...
>>> MyTest('test_something').test_something()
When you nest patch decorators the mocks are passed in to the decorated
function in the same order they applied (the normal *python* order that
decorators are applied). This means from the bottom up, so in the example
above the mock for `test_module.ClassName2` is passed in first.
There is also :func:`patch.dict` for setting values in a dictionary just
during a scope and restoring the dictionary to its original state when the test
ends:
.. doctest::
>>> foo = {'key': 'value'}
>>> original = foo.copy()
>>> with patch.dict(foo, {'newkey': 'newvalue'}, clear=True):
... assert foo == {'newkey': 'newvalue'}
...
>>> assert foo == original
`patch`, `patch.object` and `patch.dict` can all be used as context managers.
Where you use `patch` to create a mock for you, you can get a reference to the
mock using the "as" form of the with statement:
.. doctest::
>>> class ProductionClass(object):
... def method(self):
... pass
...
>>> with patch.object(ProductionClass, 'method') as mock_method:
... mock_method.return_value = None
... real = ProductionClass()
... real.method(1, 2, 3)
...
>>> mock_method.assert_called_with(1, 2, 3)
As an alternative `patch`, `patch.object` and `patch.dict` can be used as
class decorators. When used in this way it is the same as applying the
decorator indvidually to every method whose name starts with "test".
For some more advanced examples, see the :ref:`further-examples` page.

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====================================
Mock - Mocking and Testing Library
====================================
.. currentmodule:: mock
:Author: `Michael Foord
<http://www.voidspace.org.uk/python/weblog/index.shtml>`_
:Version: |release|
:Date: 2012/10/07
:Homepage: `Mock Homepage`_
:Download: `Mock on PyPI`_
:Documentation: `PDF Documentation
<http://www.voidspace.org.uk/downloads/mock-1.0.0.pdf>`_
:License: `BSD License`_
:Support: `Mailing list (testing-in-python@lists.idyll.org)
<http://lists.idyll.org/listinfo/testing-in-python>`_
:Issue tracker: `Google code project
<http://code.google.com/p/mock/issues/list>`_
.. _Mock Homepage: http://www.voidspace.org.uk/python/mock/
.. _BSD License: http://www.voidspace.org.uk/python/license.shtml
.. currentmodule:: mock
.. module:: mock
:synopsis: Mock object and testing library.
.. index:: introduction
mock is a library for testing in Python. It allows you to replace parts of
your system under test with mock objects and make assertions about how they
have been used.
mock is now part of the Python standard library, available as `unittest.mock
<http://docs.python.org/py3k/library/unittest.mock.html#module-unittest.mock>`_
in Python 3.3 onwards.
mock provides a core :class:`Mock` class removing the need to create a host
of stubs throughout your test suite. After performing an action, you can make
assertions about which methods / attributes were used and arguments they were
called with. You can also specify return values and set needed attributes in
the normal way.
Additionally, mock provides a :func:`patch` decorator that handles patching
module and class level attributes within the scope of a test, along with
:const:`sentinel` for creating unique objects. See the `quick guide`_ for
some examples of how to use :class:`Mock`, :class:`MagicMock` and
:func:`patch`.
Mock is very easy to use and is designed for use with
`unittest <http://pypi.python.org/pypi/unittest2>`_. Mock is based on
the 'action -> assertion' pattern instead of `'record -> replay'` used by many
mocking frameworks.
mock is tested on Python versions 2.4-2.7, Python 3 plus the latest versions of
Jython and PyPy.
.. testsetup::
class ProductionClass(object):
def method(self, *args):
pass
module = sys.modules['module'] = ProductionClass
ProductionClass.ClassName1 = ProductionClass
ProductionClass.ClassName2 = ProductionClass
API Documentation
=================
.. toctree::
:maxdepth: 2
mock
patch
helpers
sentinel
magicmock
User Guide
==========
.. toctree::
:maxdepth: 2
getting-started
examples
compare
changelog
.. index:: installing
Installing
==========
The current version is |release|. Mock is stable and widely used. If you do
find any bugs, or have suggestions for improvements / extensions
then please contact us.
* `mock on PyPI <http://pypi.python.org/pypi/mock>`_
* `mock documentation as PDF
<http://www.voidspace.org.uk/downloads/mock-1.0.0.pdf>`_
* `Google Code Home & Mercurial Repository <http://code.google.com/p/mock/>`_
.. index:: repository
.. index:: hg
You can checkout the latest development version from the Google Code Mercurial
repository with the following command:
``hg clone https://mock.googlecode.com/hg/ mock``
.. index:: pip
.. index:: easy_install
.. index:: setuptools
If you have pip, setuptools or distribute you can install mock with:
| ``easy_install -U mock``
| ``pip install -U mock``
Alternatively you can download the mock distribution from PyPI and after
unpacking run:
``python setup.py install``
Quick Guide
===========
:class:`Mock` and :class:`MagicMock` objects create all attributes and
methods as you access them and store details of how they have been used. You
can configure them, to specify return values or limit what attributes are
available, and then make assertions about how they have been used:
.. doctest::
>>> from mock import MagicMock
>>> thing = ProductionClass()
>>> thing.method = MagicMock(return_value=3)
>>> thing.method(3, 4, 5, key='value')
3
>>> thing.method.assert_called_with(3, 4, 5, key='value')
:attr:`side_effect` allows you to perform side effects, including raising an
exception when a mock is called:
.. doctest::
>>> mock = Mock(side_effect=KeyError('foo'))
>>> mock()
Traceback (most recent call last):
...
KeyError: 'foo'
>>> values = {'a': 1, 'b': 2, 'c': 3}
>>> def side_effect(arg):
... return values[arg]
...
>>> mock.side_effect = side_effect
>>> mock('a'), mock('b'), mock('c')
(1, 2, 3)
>>> mock.side_effect = [5, 4, 3, 2, 1]
>>> mock(), mock(), mock()
(5, 4, 3)
Mock has many other ways you can configure it and control its behaviour. For
example the `spec` argument configures the mock to take its specification
from another object. Attempting to access attributes or methods on the mock
that don't exist on the spec will fail with an `AttributeError`.
The :func:`patch` decorator / context manager makes it easy to mock classes or
objects in a module under test. The object you specify will be replaced with a
mock (or other object) during the test and restored when the test ends:
.. doctest::
>>> from mock import patch
>>> @patch('module.ClassName2')
... @patch('module.ClassName1')
... def test(MockClass1, MockClass2):
... module.ClassName1()
... module.ClassName2()
... assert MockClass1 is module.ClassName1
... assert MockClass2 is module.ClassName2
... assert MockClass1.called
... assert MockClass2.called
...
>>> test()
.. note::
When you nest patch decorators the mocks are passed in to the decorated
function in the same order they applied (the normal *python* order that
decorators are applied). This means from the bottom up, so in the example
above the mock for `module.ClassName1` is passed in first.
With `patch` it matters that you patch objects in the namespace where they
are looked up. This is normally straightforward, but for a quick guide
read :ref:`where to patch <where-to-patch>`.
As well as a decorator `patch` can be used as a context manager in a with
statement:
.. doctest::
>>> with patch.object(ProductionClass, 'method', return_value=None) as mock_method:
... thing = ProductionClass()
... thing.method(1, 2, 3)
...
>>> mock_method.assert_called_once_with(1, 2, 3)
There is also :func:`patch.dict` for setting values in a dictionary just
during a scope and restoring the dictionary to its original state when the test
ends:
.. doctest::
>>> foo = {'key': 'value'}
>>> original = foo.copy()
>>> with patch.dict(foo, {'newkey': 'newvalue'}, clear=True):
... assert foo == {'newkey': 'newvalue'}
...
>>> assert foo == original
Mock supports the mocking of Python :ref:`magic methods <magic-methods>`. The
easiest way of using magic methods is with the :class:`MagicMock` class. It
allows you to do things like:
.. doctest::
>>> mock = MagicMock()
>>> mock.__str__.return_value = 'foobarbaz'
>>> str(mock)
'foobarbaz'
>>> mock.__str__.assert_called_with()
Mock allows you to assign functions (or other Mock instances) to magic methods
and they will be called appropriately. The `MagicMock` class is just a Mock
variant that has all of the magic methods pre-created for you (well, all the
useful ones anyway).
The following is an example of using magic methods with the ordinary Mock
class:
.. doctest::
>>> mock = Mock()
>>> mock.__str__ = Mock(return_value='wheeeeee')
>>> str(mock)
'wheeeeee'
For ensuring that the mock objects in your tests have the same api as the
objects they are replacing, you can use :ref:`auto-speccing <auto-speccing>`.
Auto-speccing can be done through the `autospec` argument to patch, or the
:func:`create_autospec` function. Auto-speccing creates mock objects that
have the same attributes and methods as the objects they are replacing, and
any functions and methods (including constructors) have the same call
signature as the real object.
This ensures that your mocks will fail in the same way as your production
code if they are used incorrectly:
.. doctest::
>>> from mock import create_autospec
>>> def function(a, b, c):
... pass
...
>>> mock_function = create_autospec(function, return_value='fishy')
>>> mock_function(1, 2, 3)
'fishy'
>>> mock_function.assert_called_once_with(1, 2, 3)
>>> mock_function('wrong arguments')
Traceback (most recent call last):
...
TypeError: <lambda>() takes exactly 3 arguments (1 given)
`create_autospec` can also be used on classes, where it copies the signature of
the `__init__` method, and on callable objects where it copies the signature of
the `__call__` method.
.. index:: references
.. index:: articles
References
==========
Articles, blog entries and other stuff related to testing with Mock:
* `Imposing a No DB Discipline on Django unit tests
<https://github.com/carljm/django-testing-slides/blob/master/models/30_no_database.md>`_
* `mock-django: tools for mocking the Django ORM and models
<https://github.com/dcramer/mock-django>`_
* `PyCon 2011 Video: Testing with mock <https://blip.tv/file/4881513>`_
* `Mock objects in Python
<http://noopenblockers.com/2012/01/06/mock-objects-in-python/>`_
* `Python: Injecting Mock Objects for Powerful Testing
<http://blueprintforge.com/blog/2012/01/08/python-injecting-mock-objects-for-powerful-testing/>`_
* `Python Mock: How to assert a substring of logger output
<http://www.michaelpollmeier.com/python-mock-how-to-assert-a-substring-of-logger-output/>`_
* `Mocking Django <http://www.mattjmorrison.com/2011/09/mocking-django.html>`_
* `Mocking dates and other classes that can't be modified
<http://williamjohnbert.com/2011/07/how-to-unit-testing-in-django-with-mocking-and-patching/>`_
* `Mock recipes <http://konryd.blogspot.com/2010/06/mock-recipies.html>`_
* `Mockity mock mock - some love for the mock module
<http://konryd.blogspot.com/2010/05/mockity-mock-mock-some-love-for-mock.html>`_
* `Coverage and Mock (with django)
<http://mattsnider.com/python/mock-and-coverage/>`_
* `Python Unit Testing with Mock <http://www.insomnihack.com/?p=194>`_
* `Getting started with Python Mock
<http://myadventuresincoding.wordpress.com/2011/02/26/python-python-mock-cheat-sheet/>`_
* `Smart Parameter Checks with mock
<http://tobyho.com/2011/03/24/smart-parameter-checks-in/>`_
* `Python mock testing techniques and tools
<http://agiletesting.blogspot.com/2009/07/python-mock-testing-techniques-and.html>`_
* `How To Test Django Template Tags
<http://techblog.ironfroggy.com/2008/10/how-to-test.html>`_
* `A presentation on Unit Testing with Mock
<http://pypap.blogspot.com/2008/10/newbie-nugget-unit-testing-with-mock.html>`_
* `Mocking with Django and Google AppEngine
<http://michael-a-nelson.blogspot.com/2008/09/mocking-with-django-and-google-app.html>`_
.. index:: tests
.. index:: unittest2
Tests
=====
Mock uses `unittest2 <http://pypi.python.org/pypi/unittest2>`_ for its own
test suite. In order to run it, use the `unit2` script that comes with
`unittest2` module on a checkout of the source repository:
`unit2 discover`
If you have `setuptools <http://pypi.python.org/pypi/distribute>`_ as well as
unittest2 you can run:
``python setup.py test``
On Python 3.2 you can use ``unittest`` module from the standard library.
``python3.2 -m unittest discover``
.. index:: Python 3
On Python 3 the tests for unicode are skipped as they are not relevant. On
Python 2.4 tests that use the with statements are skipped as the with statement
is invalid syntax on Python 2.4.
.. index:: older versions
Older Versions
==============
Documentation for older versions of mock:
* `mock 0.8 <http://www.voidspace.org.uk/python/mock/0.8/>`_
* `mock 0.7 <http://www.voidspace.org.uk/python/mock/0.7/>`_
* `mock 0.6 <http://www.voidspace.org.uk/python/mock/0.6.0/>`_
Docs from the in-development version of `mock` can be found at
`mock.readthedocs.org <http://mock.readthedocs.org>`_.
Terminology
===========
Terminology for objects used to replace other ones can be confusing. Terms
like double, fake, mock, stub, and spy are all used with varying meanings.
In `classic mock terminology
<http://xunitpatterns.com/Mocks,%20Fakes,%20Stubs%20and%20Dummies.html>`_
:class:`mock.Mock` is a `spy <http://xunitpatterns.com/Test%20Spy.html>`_ that
allows for *post-mortem* examination. This is what I call the "action ->
assertion" [#]_ pattern of testing.
I'm not however a fan of this "statically typed mocking terminology"
promulgated by `Martin Fowler
<http://martinfowler.com/articles/mocksArentStubs.html>`_. It confuses usage
patterns with implementation and prevents you from using natural terminology
when discussing mocking.
I much prefer duck typing, if an object used in your test suite looks like a
mock object and quacks like a mock object then it's fine to call it a mock, no
matter what the implementation looks like.
This terminology is perhaps more useful in less capable languages where
different usage patterns will *require* different implementations.
`mock.Mock()` is capable of being used in most of the different roles
described by Fowler, except (annoyingly / frustratingly / ironically) a Mock
itself!
How about a simpler definition: a "mock object" is an object used to replace a
real one in a system under test.
.. [#] This pattern is called "AAA" by some members of the testing community;
"Arrange - Act - Assert".

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.. currentmodule:: mock
.. _magic-methods:
Mocking Magic Methods
=====================
.. currentmodule:: mock
:class:`Mock` supports mocking `magic methods
<http://www.ironpythoninaction.com/magic-methods.html>`_. This allows mock
objects to replace containers or other objects that implement Python
protocols.
Because magic methods are looked up differently from normal methods [#]_, this
support has been specially implemented. This means that only specific magic
methods are supported. The supported list includes *almost* all of them. If
there are any missing that you need please let us know!
You mock magic methods by setting the method you are interested in to a function
or a mock instance. If you are using a function then it *must* take ``self`` as
the first argument [#]_.
.. doctest::
>>> def __str__(self):
... return 'fooble'
...
>>> mock = Mock()
>>> mock.__str__ = __str__
>>> str(mock)
'fooble'
>>> mock = Mock()
>>> mock.__str__ = Mock()
>>> mock.__str__.return_value = 'fooble'
>>> str(mock)
'fooble'
>>> mock = Mock()
>>> mock.__iter__ = Mock(return_value=iter([]))
>>> list(mock)
[]
One use case for this is for mocking objects used as context managers in a
`with` statement:
.. doctest::
>>> mock = Mock()
>>> mock.__enter__ = Mock(return_value='foo')
>>> mock.__exit__ = Mock(return_value=False)
>>> with mock as m:
... assert m == 'foo'
...
>>> mock.__enter__.assert_called_with()
>>> mock.__exit__.assert_called_with(None, None, None)
Calls to magic methods do not appear in :attr:`~Mock.method_calls`, but they
are recorded in :attr:`~Mock.mock_calls`.
.. note::
If you use the `spec` keyword argument to create a mock then attempting to
set a magic method that isn't in the spec will raise an `AttributeError`.
The full list of supported magic methods is:
* ``__hash__``, ``__sizeof__``, ``__repr__`` and ``__str__``
* ``__dir__``, ``__format__`` and ``__subclasses__``
* ``__floor__``, ``__trunc__`` and ``__ceil__``
* Comparisons: ``__cmp__``, ``__lt__``, ``__gt__``, ``__le__``, ``__ge__``,
``__eq__`` and ``__ne__``
* Container methods: ``__getitem__``, ``__setitem__``, ``__delitem__``,
``__contains__``, ``__len__``, ``__iter__``, ``__getslice__``,
``__setslice__``, ``__reversed__`` and ``__missing__``
* Context manager: ``__enter__`` and ``__exit__``
* Unary numeric methods: ``__neg__``, ``__pos__`` and ``__invert__``
* The numeric methods (including right hand and in-place variants):
``__add__``, ``__sub__``, ``__mul__``, ``__div__``,
``__floordiv__``, ``__mod__``, ``__divmod__``, ``__lshift__``,
``__rshift__``, ``__and__``, ``__xor__``, ``__or__``, and ``__pow__``
* Numeric conversion methods: ``__complex__``, ``__int__``, ``__float__``,
``__index__`` and ``__coerce__``
* Descriptor methods: ``__get__``, ``__set__`` and ``__delete__``
* Pickling: ``__reduce__``, ``__reduce_ex__``, ``__getinitargs__``,
``__getnewargs__``, ``__getstate__`` and ``__setstate__``
The following methods are supported in Python 2 but don't exist in Python 3:
* ``__unicode__``, ``__long__``, ``__oct__``, ``__hex__`` and ``__nonzero__``
* ``__truediv__`` and ``__rtruediv__``
The following methods are supported in Python 3 but don't exist in Python 2:
* ``__bool__`` and ``__next__``
The following methods exist but are *not* supported as they are either in use by
mock, can't be set dynamically, or can cause problems:
* ``__getattr__``, ``__setattr__``, ``__init__`` and ``__new__``
* ``__prepare__``, ``__instancecheck__``, ``__subclasscheck__``, ``__del__``
Magic Mock
==========
There are two `MagicMock` variants: `MagicMock` and `NonCallableMagicMock`.
.. class:: MagicMock(*args, **kw)
``MagicMock`` is a subclass of :class:`Mock` with default implementations
of most of the magic methods. You can use ``MagicMock`` without having to
configure the magic methods yourself.
The constructor parameters have the same meaning as for :class:`Mock`.
If you use the `spec` or `spec_set` arguments then *only* magic methods
that exist in the spec will be created.
.. class:: NonCallableMagicMock(*args, **kw)
A non-callable version of `MagicMock`.
The constructor parameters have the same meaning as for
:class:`MagicMock`, with the exception of `return_value` and
`side_effect` which have no meaning on a non-callable mock.
The magic methods are setup with `MagicMock` objects, so you can configure them
and use them in the usual way:
.. doctest::
>>> mock = MagicMock()
>>> mock[3] = 'fish'
>>> mock.__setitem__.assert_called_with(3, 'fish')
>>> mock.__getitem__.return_value = 'result'
>>> mock[2]
'result'
By default many of the protocol methods are required to return objects of a
specific type. These methods are preconfigured with a default return value, so
that they can be used without you having to do anything if you aren't interested
in the return value. You can still *set* the return value manually if you want
to change the default.
Methods and their defaults:
* ``__lt__``: NotImplemented
* ``__gt__``: NotImplemented
* ``__le__``: NotImplemented
* ``__ge__``: NotImplemented
* ``__int__`` : 1
* ``__contains__`` : False
* ``__len__`` : 1
* ``__iter__`` : iter([])
* ``__exit__`` : False
* ``__complex__`` : 1j
* ``__float__`` : 1.0
* ``__bool__`` : True
* ``__nonzero__`` : True
* ``__oct__`` : '1'
* ``__hex__`` : '0x1'
* ``__long__`` : long(1)
* ``__index__`` : 1
* ``__hash__`` : default hash for the mock
* ``__str__`` : default str for the mock
* ``__unicode__`` : default unicode for the mock
* ``__sizeof__``: default sizeof for the mock
For example:
.. doctest::
>>> mock = MagicMock()
>>> int(mock)
1
>>> len(mock)
0
>>> hex(mock)
'0x1'
>>> list(mock)
[]
>>> object() in mock
False
The two equality method, `__eq__` and `__ne__`, are special (changed in
0.7.2). They do the default equality comparison on identity, using a side
effect, unless you change their return value to return something else:
.. doctest::
>>> MagicMock() == 3
False
>>> MagicMock() != 3
True
>>> mock = MagicMock()
>>> mock.__eq__.return_value = True
>>> mock == 3
True
In `0.8` the `__iter__` also gained special handling implemented with a
side effect. The return value of `MagicMock.__iter__` can be any iterable
object and isn't required to be an iterator:
.. doctest::
>>> mock = MagicMock()
>>> mock.__iter__.return_value = ['a', 'b', 'c']
>>> list(mock)
['a', 'b', 'c']
>>> list(mock)
['a', 'b', 'c']
If the return value *is* an iterator, then iterating over it once will consume
it and subsequent iterations will result in an empty list:
.. doctest::
>>> mock.__iter__.return_value = iter(['a', 'b', 'c'])
>>> list(mock)
['a', 'b', 'c']
>>> list(mock)
[]
``MagicMock`` has all of the supported magic methods configured except for some
of the obscure and obsolete ones. You can still set these up if you want.
Magic methods that are supported but not setup by default in ``MagicMock`` are:
* ``__cmp__``
* ``__getslice__`` and ``__setslice__``
* ``__coerce__``
* ``__subclasses__``
* ``__dir__``
* ``__format__``
* ``__get__``, ``__set__`` and ``__delete__``
* ``__reversed__`` and ``__missing__``
* ``__reduce__``, ``__reduce_ex__``, ``__getinitargs__``, ``__getnewargs__``,
``__getstate__`` and ``__setstate__``
* ``__getformat__`` and ``__setformat__``
------------
.. [#] Magic methods *should* be looked up on the class rather than the
instance. Different versions of Python are inconsistent about applying this
rule. The supported protocol methods should work with all supported versions
of Python.
.. [#] The function is basically hooked up to the class, but each ``Mock``
instance is kept isolated from the others.

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The Mock Class
==============
.. currentmodule:: mock
.. testsetup::
class SomeClass:
pass
`Mock` is a flexible mock object intended to replace the use of stubs and
test doubles throughout your code. Mocks are callable and create attributes as
new mocks when you access them [#]_. Accessing the same attribute will always
return the same mock. Mocks record how you use them, allowing you to make
assertions about what your code has done to them.
:class:`MagicMock` is a subclass of `Mock` with all the magic methods
pre-created and ready to use. There are also non-callable variants, useful
when you are mocking out objects that aren't callable:
:class:`NonCallableMock` and :class:`NonCallableMagicMock`
The :func:`patch` decorators makes it easy to temporarily replace classes
in a particular module with a `Mock` object. By default `patch` will create
a `MagicMock` for you. You can specify an alternative class of `Mock` using
the `new_callable` argument to `patch`.
.. index:: side_effect
.. index:: return_value
.. index:: wraps
.. index:: name
.. index:: spec
.. class:: Mock(spec=None, side_effect=None, return_value=DEFAULT, wraps=None, name=None, spec_set=None, **kwargs)
Create a new `Mock` object. `Mock` takes several optional arguments
that specify the behaviour of the Mock object:
* `spec`: This can be either a list of strings or an existing object (a
class or instance) that acts as the specification for the mock object. If
you pass in an object then a list of strings is formed by calling dir on
the object (excluding unsupported magic attributes and methods).
Accessing any attribute not in this list will raise an `AttributeError`.
If `spec` is an object (rather than a list of strings) then
:attr:`__class__` returns the class of the spec object. This allows mocks
to pass `isinstance` tests.
* `spec_set`: A stricter variant of `spec`. If used, attempting to *set*
or get an attribute on the mock that isn't on the object passed as
`spec_set` will raise an `AttributeError`.
* `side_effect`: A function to be called whenever the Mock is called. See
the :attr:`~Mock.side_effect` attribute. Useful for raising exceptions or
dynamically changing return values. The function is called with the same
arguments as the mock, and unless it returns :data:`DEFAULT`, the return
value of this function is used as the return value.
Alternatively `side_effect` can be an exception class or instance. In
this case the exception will be raised when the mock is called.
If `side_effect` is an iterable then each call to the mock will return
the next value from the iterable. If any of the members of the iterable
are exceptions they will be raised instead of returned.
A `side_effect` can be cleared by setting it to `None`.
* `return_value`: The value returned when the mock is called. By default
this is a new Mock (created on first access). See the
:attr:`return_value` attribute.
* `wraps`: Item for the mock object to wrap. If `wraps` is not None then
calling the Mock will pass the call through to the wrapped object
(returning the real result and ignoring `return_value`). Attribute access
on the mock will return a Mock object that wraps the corresponding
attribute of the wrapped object (so attempting to access an attribute
that doesn't exist will raise an `AttributeError`).
If the mock has an explicit `return_value` set then calls are not passed
to the wrapped object and the `return_value` is returned instead.
* `name`: If the mock has a name then it will be used in the repr of the
mock. This can be useful for debugging. The name is propagated to child
mocks.
Mocks can also be called with arbitrary keyword arguments. These will be
used to set attributes on the mock after it is created. See the
:meth:`configure_mock` method for details.
.. method:: assert_called_with(*args, **kwargs)
This method is a convenient way of asserting that calls are made in a
particular way:
.. doctest::
>>> mock = Mock()
>>> mock.method(1, 2, 3, test='wow')
<Mock name='mock.method()' id='...'>
>>> mock.method.assert_called_with(1, 2, 3, test='wow')
.. method:: assert_called_once_with(*args, **kwargs)
Assert that the mock was called exactly once and with the specified
arguments.
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock('foo', bar='baz')
>>> mock.assert_called_once_with('foo', bar='baz')
>>> mock('foo', bar='baz')
>>> mock.assert_called_once_with('foo', bar='baz')
Traceback (most recent call last):
...
AssertionError: Expected to be called once. Called 2 times.
.. method:: assert_any_call(*args, **kwargs)
assert the mock has been called with the specified arguments.
The assert passes if the mock has *ever* been called, unlike
:meth:`assert_called_with` and :meth:`assert_called_once_with` that
only pass if the call is the most recent one.
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock(1, 2, arg='thing')
>>> mock('some', 'thing', 'else')
>>> mock.assert_any_call(1, 2, arg='thing')
.. method:: assert_has_calls(calls, any_order=False)
assert the mock has been called with the specified calls.
The `mock_calls` list is checked for the calls.
If `any_order` is False (the default) then the calls must be
sequential. There can be extra calls before or after the
specified calls.
If `any_order` is True then the calls can be in any order, but
they must all appear in :attr:`mock_calls`.
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock(1)
>>> mock(2)
>>> mock(3)
>>> mock(4)
>>> calls = [call(2), call(3)]
>>> mock.assert_has_calls(calls)
>>> calls = [call(4), call(2), call(3)]
>>> mock.assert_has_calls(calls, any_order=True)
.. method:: reset_mock()
The reset_mock method resets all the call attributes on a mock object:
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock('hello')
>>> mock.called
True
>>> mock.reset_mock()
>>> mock.called
False
This can be useful where you want to make a series of assertions that
reuse the same object. Note that `reset_mock` *doesn't* clear the
return value, :attr:`side_effect` or any child attributes you have
set using normal assignment. Child mocks and the return value mock
(if any) are reset as well.
.. method:: mock_add_spec(spec, spec_set=False)
Add a spec to a mock. `spec` can either be an object or a
list of strings. Only attributes on the `spec` can be fetched as
attributes from the mock.
If `spec_set` is `True` then only attributes on the spec can be set.
.. method:: attach_mock(mock, attribute)
Attach a mock as an attribute of this one, replacing its name and
parent. Calls to the attached mock will be recorded in the
:attr:`method_calls` and :attr:`mock_calls` attributes of this one.
.. method:: configure_mock(**kwargs)
Set attributes on the mock through keyword arguments.
Attributes plus return values and side effects can be set on child
mocks using standard dot notation and unpacking a dictionary in the
method call:
.. doctest::
>>> mock = Mock()
>>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
>>> mock.configure_mock(**attrs)
>>> mock.method()
3
>>> mock.other()
Traceback (most recent call last):
...
KeyError
The same thing can be achieved in the constructor call to mocks:
.. doctest::
>>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
>>> mock = Mock(some_attribute='eggs', **attrs)
>>> mock.some_attribute
'eggs'
>>> mock.method()
3
>>> mock.other()
Traceback (most recent call last):
...
KeyError
`configure_mock` exists to make it easier to do configuration
after the mock has been created.
.. method:: __dir__()
`Mock` objects limit the results of `dir(some_mock)` to useful results.
For mocks with a `spec` this includes all the permitted attributes
for the mock.
See :data:`FILTER_DIR` for what this filtering does, and how to
switch it off.
.. method:: _get_child_mock(**kw)
Create the child mocks for attributes and return value.
By default child mocks will be the same type as the parent.
Subclasses of Mock may want to override this to customize the way
child mocks are made.
For non-callable mocks the callable variant will be used (rather than
any custom subclass).
.. attribute:: called
A boolean representing whether or not the mock object has been called:
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock.called
False
>>> mock()
>>> mock.called
True
.. attribute:: call_count
An integer telling you how many times the mock object has been called:
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock.call_count
0
>>> mock()
>>> mock()
>>> mock.call_count
2
.. attribute:: return_value
Set this to configure the value returned by calling the mock:
.. doctest::
>>> mock = Mock()
>>> mock.return_value = 'fish'
>>> mock()
'fish'
The default return value is a mock object and you can configure it in
the normal way:
.. doctest::
>>> mock = Mock()
>>> mock.return_value.attribute = sentinel.Attribute
>>> mock.return_value()
<Mock name='mock()()' id='...'>
>>> mock.return_value.assert_called_with()
`return_value` can also be set in the constructor:
.. doctest::
>>> mock = Mock(return_value=3)
>>> mock.return_value
3
>>> mock()
3
.. attribute:: side_effect
This can either be a function to be called when the mock is called,
or an exception (class or instance) to be raised.
If you pass in a function it will be called with same arguments as the
mock and unless the function returns the :data:`DEFAULT` singleton the
call to the mock will then return whatever the function returns. If the
function returns :data:`DEFAULT` then the mock will return its normal
value (from the :attr:`return_value`.
An example of a mock that raises an exception (to test exception
handling of an API):
.. doctest::
>>> mock = Mock()
>>> mock.side_effect = Exception('Boom!')
>>> mock()
Traceback (most recent call last):
...
Exception: Boom!
Using `side_effect` to return a sequence of values:
.. doctest::
>>> mock = Mock()
>>> mock.side_effect = [3, 2, 1]
>>> mock(), mock(), mock()
(3, 2, 1)
The `side_effect` function is called with the same arguments as the
mock (so it is wise for it to take arbitrary args and keyword
arguments) and whatever it returns is used as the return value for
the call. The exception is if `side_effect` returns :data:`DEFAULT`,
in which case the normal :attr:`return_value` is used.
.. doctest::
>>> mock = Mock(return_value=3)
>>> def side_effect(*args, **kwargs):
... return DEFAULT
...
>>> mock.side_effect = side_effect
>>> mock()
3
`side_effect` can be set in the constructor. Here's an example that
adds one to the value the mock is called with and returns it:
.. doctest::
>>> side_effect = lambda value: value + 1
>>> mock = Mock(side_effect=side_effect)
>>> mock(3)
4
>>> mock(-8)
-7
Setting `side_effect` to `None` clears it:
.. doctest::
>>> from mock import Mock
>>> m = Mock(side_effect=KeyError, return_value=3)
>>> m()
Traceback (most recent call last):
...
KeyError
>>> m.side_effect = None
>>> m()
3
.. attribute:: call_args
This is either `None` (if the mock hasn't been called), or the
arguments that the mock was last called with. This will be in the
form of a tuple: the first member is any ordered arguments the mock
was called with (or an empty tuple) and the second member is any
keyword arguments (or an empty dictionary).
.. doctest::
>>> mock = Mock(return_value=None)
>>> print mock.call_args
None
>>> mock()
>>> mock.call_args
call()
>>> mock.call_args == ()
True
>>> mock(3, 4)
>>> mock.call_args
call(3, 4)
>>> mock.call_args == ((3, 4),)
True
>>> mock(3, 4, 5, key='fish', next='w00t!')
>>> mock.call_args
call(3, 4, 5, key='fish', next='w00t!')
`call_args`, along with members of the lists :attr:`call_args_list`,
:attr:`method_calls` and :attr:`mock_calls` are :data:`call` objects.
These are tuples, so they can be unpacked to get at the individual
arguments and make more complex assertions. See
:ref:`calls as tuples <calls-as-tuples>`.
.. attribute:: call_args_list
This is a list of all the calls made to the mock object in sequence
(so the length of the list is the number of times it has been
called). Before any calls have been made it is an empty list. The
:data:`call` object can be used for conveniently constructing lists of
calls to compare with `call_args_list`.
.. doctest::
>>> mock = Mock(return_value=None)
>>> mock()
>>> mock(3, 4)
>>> mock(key='fish', next='w00t!')
>>> mock.call_args_list
[call(), call(3, 4), call(key='fish', next='w00t!')]
>>> expected = [(), ((3, 4),), ({'key': 'fish', 'next': 'w00t!'},)]
>>> mock.call_args_list == expected
True
Members of `call_args_list` are :data:`call` objects. These can be
unpacked as tuples to get at the individual arguments. See
:ref:`calls as tuples <calls-as-tuples>`.
.. attribute:: method_calls
As well as tracking calls to themselves, mocks also track calls to
methods and attributes, and *their* methods and attributes:
.. doctest::
>>> mock = Mock()
>>> mock.method()
<Mock name='mock.method()' id='...'>
>>> mock.property.method.attribute()
<Mock name='mock.property.method.attribute()' id='...'>
>>> mock.method_calls
[call.method(), call.property.method.attribute()]
Members of `method_calls` are :data:`call` objects. These can be
unpacked as tuples to get at the individual arguments. See
:ref:`calls as tuples <calls-as-tuples>`.
.. attribute:: mock_calls
`mock_calls` records *all* calls to the mock object, its methods, magic
methods *and* return value mocks.
.. doctest::
>>> mock = MagicMock()
>>> result = mock(1, 2, 3)
>>> mock.first(a=3)
<MagicMock name='mock.first()' id='...'>
>>> mock.second()
<MagicMock name='mock.second()' id='...'>
>>> int(mock)
1
>>> result(1)
<MagicMock name='mock()()' id='...'>
>>> expected = [call(1, 2, 3), call.first(a=3), call.second(),
... call.__int__(), call()(1)]
>>> mock.mock_calls == expected
True
Members of `mock_calls` are :data:`call` objects. These can be
unpacked as tuples to get at the individual arguments. See
:ref:`calls as tuples <calls-as-tuples>`.
.. attribute:: __class__
Normally the `__class__` attribute of an object will return its type.
For a mock object with a `spec` `__class__` returns the spec class
instead. This allows mock objects to pass `isinstance` tests for the
object they are replacing / masquerading as:
.. doctest::
>>> mock = Mock(spec=3)
>>> isinstance(mock, int)
True
`__class__` is assignable to, this allows a mock to pass an
`isinstance` check without forcing you to use a spec:
.. doctest::
>>> mock = Mock()
>>> mock.__class__ = dict
>>> isinstance(mock, dict)
True
.. class:: NonCallableMock(spec=None, wraps=None, name=None, spec_set=None, **kwargs)
A non-callable version of `Mock`. The constructor parameters have the same
meaning of `Mock`, with the exception of `return_value` and `side_effect`
which have no meaning on a non-callable mock.
Mock objects that use a class or an instance as a `spec` or `spec_set` are able
to pass `isintance` tests:
.. doctest::
>>> mock = Mock(spec=SomeClass)
>>> isinstance(mock, SomeClass)
True
>>> mock = Mock(spec_set=SomeClass())
>>> isinstance(mock, SomeClass)
True
The `Mock` classes have support for mocking magic methods. See :ref:`magic
methods <magic-methods>` for the full details.
The mock classes and the :func:`patch` decorators all take arbitrary keyword
arguments for configuration. For the `patch` decorators the keywords are
passed to the constructor of the mock being created. The keyword arguments
are for configuring attributes of the mock:
.. doctest::
>>> m = MagicMock(attribute=3, other='fish')
>>> m.attribute
3
>>> m.other
'fish'
The return value and side effect of child mocks can be set in the same way,
using dotted notation. As you can't use dotted names directly in a call you
have to create a dictionary and unpack it using `**`:
.. doctest::
>>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
>>> mock = Mock(some_attribute='eggs', **attrs)
>>> mock.some_attribute
'eggs'
>>> mock.method()
3
>>> mock.other()
Traceback (most recent call last):
...
KeyError
.. class:: PropertyMock(*args, **kwargs)
A mock intended to be used as a property, or other descriptor, on a class.
`PropertyMock` provides `__get__` and `__set__` methods so you can specify
a return value when it is fetched.
Fetching a `PropertyMock` instance from an object calls the mock, with
no args. Setting it calls the mock with the value being set.
.. doctest::
>>> class Foo(object):
... @property
... def foo(self):
... return 'something'
... @foo.setter
... def foo(self, value):
... pass
...
>>> with patch('__main__.Foo.foo', new_callable=PropertyMock) as mock_foo:
... mock_foo.return_value = 'mockity-mock'
... this_foo = Foo()
... print this_foo.foo
... this_foo.foo = 6
...
mockity-mock
>>> mock_foo.mock_calls
[call(), call(6)]
Because of the way mock attributes are stored you can't directly attach a
`PropertyMock` to a mock object. Instead you can attach it to the mock type
object:
.. doctest::
>>> m = MagicMock()
>>> p = PropertyMock(return_value=3)
>>> type(m).foo = p
>>> m.foo
3
>>> p.assert_called_once_with()
.. index:: __call__
.. index:: calling
Calling
=======
Mock objects are callable. The call will return the value set as the
:attr:`~Mock.return_value` attribute. The default return value is a new Mock
object; it is created the first time the return value is accessed (either
explicitly or by calling the Mock) - but it is stored and the same one
returned each time.
Calls made to the object will be recorded in the attributes
like :attr:`~Mock.call_args` and :attr:`~Mock.call_args_list`.
If :attr:`~Mock.side_effect` is set then it will be called after the call has
been recorded, so if `side_effect` raises an exception the call is still
recorded.
The simplest way to make a mock raise an exception when called is to make
:attr:`~Mock.side_effect` an exception class or instance:
.. doctest::
>>> m = MagicMock(side_effect=IndexError)
>>> m(1, 2, 3)
Traceback (most recent call last):
...
IndexError
>>> m.mock_calls
[call(1, 2, 3)]
>>> m.side_effect = KeyError('Bang!')
>>> m('two', 'three', 'four')
Traceback (most recent call last):
...
KeyError: 'Bang!'
>>> m.mock_calls
[call(1, 2, 3), call('two', 'three', 'four')]
If `side_effect` is a function then whatever that function returns is what
calls to the mock return. The `side_effect` function is called with the
same arguments as the mock. This allows you to vary the return value of the
call dynamically, based on the input:
.. doctest::
>>> def side_effect(value):
... return value + 1
...
>>> m = MagicMock(side_effect=side_effect)
>>> m(1)
2
>>> m(2)
3
>>> m.mock_calls
[call(1), call(2)]
If you want the mock to still return the default return value (a new mock), or
any set return value, then there are two ways of doing this. Either return
`mock.return_value` from inside `side_effect`, or return :data:`DEFAULT`:
.. doctest::
>>> m = MagicMock()
>>> def side_effect(*args, **kwargs):
... return m.return_value
...
>>> m.side_effect = side_effect
>>> m.return_value = 3
>>> m()
3
>>> def side_effect(*args, **kwargs):
... return DEFAULT
...
>>> m.side_effect = side_effect
>>> m()
3
To remove a `side_effect`, and return to the default behaviour, set the
`side_effect` to `None`:
.. doctest::
>>> m = MagicMock(return_value=6)
>>> def side_effect(*args, **kwargs):
... return 3
...
>>> m.side_effect = side_effect
>>> m()
3
>>> m.side_effect = None
>>> m()
6
The `side_effect` can also be any iterable object. Repeated calls to the mock
will return values from the iterable (until the iterable is exhausted and
a `StopIteration` is raised):
.. doctest::
>>> m = MagicMock(side_effect=[1, 2, 3])
>>> m()
1
>>> m()
2
>>> m()
3
>>> m()
Traceback (most recent call last):
...
StopIteration
If any members of the iterable are exceptions they will be raised instead of
returned:
.. doctest::
>>> iterable = (33, ValueError, 66)
>>> m = MagicMock(side_effect=iterable)
>>> m()
33
>>> m()
Traceback (most recent call last):
...
ValueError
>>> m()
66
.. _deleting-attributes:
Deleting Attributes
===================
Mock objects create attributes on demand. This allows them to pretend to be
objects of any type.
You may want a mock object to return `False` to a `hasattr` call, or raise an
`AttributeError` when an attribute is fetched. You can do this by providing
an object as a `spec` for a mock, but that isn't always convenient.
You "block" attributes by deleting them. Once deleted, accessing an attribute
will raise an `AttributeError`.
.. doctest::
>>> mock = MagicMock()
>>> hasattr(mock, 'm')
True
>>> del mock.m
>>> hasattr(mock, 'm')
False
>>> del mock.f
>>> mock.f
Traceback (most recent call last):
...
AttributeError: f
Attaching Mocks as Attributes
=============================
When you attach a mock as an attribute of another mock (or as the return
value) it becomes a "child" of that mock. Calls to the child are recorded in
the :attr:`~Mock.method_calls` and :attr:`~Mock.mock_calls` attributes of the
parent. This is useful for configuring child mocks and then attaching them to
the parent, or for attaching mocks to a parent that records all calls to the
children and allows you to make assertions about the order of calls between
mocks:
.. doctest::
>>> parent = MagicMock()
>>> child1 = MagicMock(return_value=None)
>>> child2 = MagicMock(return_value=None)
>>> parent.child1 = child1
>>> parent.child2 = child2
>>> child1(1)
>>> child2(2)
>>> parent.mock_calls
[call.child1(1), call.child2(2)]
The exception to this is if the mock has a name. This allows you to prevent
the "parenting" if for some reason you don't want it to happen.
.. doctest::
>>> mock = MagicMock()
>>> not_a_child = MagicMock(name='not-a-child')
>>> mock.attribute = not_a_child
>>> mock.attribute()
<MagicMock name='not-a-child()' id='...'>
>>> mock.mock_calls
[]
Mocks created for you by :func:`patch` are automatically given names. To
attach mocks that have names to a parent you use the :meth:`~Mock.attach_mock`
method:
.. doctest::
>>> thing1 = object()
>>> thing2 = object()
>>> parent = MagicMock()
>>> with patch('__main__.thing1', return_value=None) as child1:
... with patch('__main__.thing2', return_value=None) as child2:
... parent.attach_mock(child1, 'child1')
... parent.attach_mock(child2, 'child2')
... child1('one')
... child2('two')
...
>>> parent.mock_calls
[call.child1('one'), call.child2('two')]
-----
.. [#] The only exceptions are magic methods and attributes (those that have
leading and trailing double underscores). Mock doesn't create these but
instead of raises an ``AttributeError``. This is because the interpreter
will often implicitly request these methods, and gets *very* confused to
get a new Mock object when it expects a magic method. If you need magic
method support see :ref:`magic methods <magic-methods>`.

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mocksignature
=============
.. currentmodule:: mock
.. note::
:ref:`auto-speccing`, added in mock 0.8, is a more advanced version of
`mocksignature` and can be used for many of the same use cases.
A problem with using mock objects to replace real objects in your tests is that
:class:`Mock` can be *too* flexible. Your code can treat the mock objects in
any way and you have to manually check that they were called correctly. If your
code calls functions or methods with the wrong number of arguments then mocks
don't complain.
The solution to this is `mocksignature`, which creates functions with the
same signature as the original, but delegating to a mock. You can interrogate
the mock in the usual way to check it has been called with the *right*
arguments, but if it is called with the wrong number of arguments it will
raise a `TypeError` in the same way your production code would.
Another advantage is that your mocked objects are real functions, which can
be useful when your code uses
`inspect <http://docs.python.org/library/inspect.html>`_ or depends on
functions being function objects.
.. function:: mocksignature(func, mock=None, skipfirst=False)
Create a new function with the same signature as `func` that delegates
to `mock`. If `skipfirst` is True the first argument is skipped, useful
for methods where `self` needs to be omitted from the new function.
If you don't pass in a `mock` then one will be created for you.
Functions returned by `mocksignature` have many of the same attributes
and assert methods as a mock object.
The mock is set as the `mock` attribute of the returned function for easy
access.
`mocksignature` can also be used with classes. It copies the signature of
the `__init__` method.
When used with callable objects (instances) it copies the signature of the
`__call__` method.
`mocksignature` will work out if it is mocking the signature of a method on
an instance or a method on a class and do the "right thing" with the `self`
argument in both cases.
Because of a limitation in the way that arguments are collected by functions
created by `mocksignature` they are *always* passed as positional arguments
(including defaults) and not keyword arguments.
mocksignature api
-----------------
Although the objects returned by `mocksignature` api are real function objects,
they have much of the same api as the :class:`Mock` class. This includes the
assert methods:
.. doctest::
>>> def func(a, b, c):
... pass
...
>>> func2 = mocksignature(func)
>>> func2.called
False
>>> func2.return_value = 3
>>> func2(1, 2, 3)
3
>>> func2.called
True
>>> func2.assert_called_once_with(1, 2, 3)
>>> func2.assert_called_with(1, 2, 4)
Traceback (most recent call last):
...
AssertionError: Expected call: mock(1, 2, 4)
Actual call: mock(1, 2, 3)
>>> func2.call_count
1
>>> func2.side_effect = IndexError
>>> func2(4, 5, 6)
Traceback (most recent call last):
...
IndexError
The mock object that is being delegated to is available as the `mock` attribute
of the function created by `mocksignature`.
.. doctest::
>>> func2.mock.mock_calls
[call(1, 2, 3), call(4, 5, 6)]
The methods and attributes available on functions returned by `mocksignature`
are:
:meth:`~Mock.assert_any_call`, :meth:`~Mock.assert_called_once_with`,
:meth:`~Mock.assert_called_with`, :meth:`~Mock.assert_has_calls`,
:attr:`~Mock.call_args`, :attr:`~Mock.call_args_list`,
:attr:`~Mock.call_count`, :attr:`~Mock.called`,
:attr:`~Mock.method_calls`, `mock`, :attr:`~Mock.mock_calls`,
:meth:`~Mock.reset_mock`, :attr:`~Mock.return_value`, and
:attr:`~Mock.side_effect`.
Example use
-----------
Basic use
~~~~~~~~~
.. doctest::
>>> def function(a, b, c=None):
... pass
...
>>> mock = Mock()
>>> function = mocksignature(function, mock)
>>> function()
Traceback (most recent call last):
...
TypeError: <lambda>() takes at least 2 arguments (0 given)
>>> function.return_value = 'some value'
>>> function(1, 2, 'foo')
'some value'
>>> function.assert_called_with(1, 2, 'foo')
Keyword arguments
~~~~~~~~~~~~~~~~~
Note that arguments to functions created by `mocksignature` are always passed
in to the underlying mock by position even when called with keywords:
.. doctest::
>>> def function(a, b, c=None):
... pass
...
>>> function = mocksignature(function)
>>> function.return_value = None
>>> function(1, 2)
>>> function.assert_called_with(1, 2, None)
Mocking methods and self
~~~~~~~~~~~~~~~~~~~~~~~~
When you use `mocksignature` to replace a method on a class then `self`
will be included in the method signature - and you will need to include
the instance when you do your asserts.
As a curious factor of the way Python (2) wraps methods fetched from a class,
we can *get* the `return_value` from a function set on a class, but we can't
set it. We have to do this through the exposed `mock` attribute instead:
.. doctest::
>>> class SomeClass(object):
... def method(self, a, b, c=None):
... pass
...
>>> SomeClass.method = mocksignature(SomeClass.method)
>>> SomeClass.method.mock.return_value = None
>>> instance = SomeClass()
>>> instance.method()
Traceback (most recent call last):
...
TypeError: <lambda>() takes at least 4 arguments (1 given)
>>> instance.method(1, 2, 3)
>>> instance.method.assert_called_with(instance, 1, 2, 3)
When you use `mocksignature` on instance methods `self` isn't included (and we
can set the `return_value` etc directly):
.. doctest::
>>> class SomeClass(object):
... def method(self, a, b, c=None):
... pass
...
>>> instance = SomeClass()
>>> instance.method = mocksignature(instance.method)
>>> instance.method.return_value = None
>>> instance.method(1, 2, 3)
>>> instance.method.assert_called_with(1, 2, 3)
mocksignature with classes
~~~~~~~~~~~~~~~~~~~~~~~~~~
When used with a class `mocksignature` copies the signature of the `__init__`
method.
.. doctest::
>>> class Something(object):
... def __init__(self, foo, bar):
... pass
...
>>> MockSomething = mocksignature(Something)
>>> instance = MockSomething(10, 9)
>>> assert instance is MockSomething.return_value
>>> MockSomething.assert_called_with(10, 9)
>>> MockSomething()
Traceback (most recent call last):
...
TypeError: <lambda>() takes at least 2 arguments (0 given)
Because the object returned by `mocksignature` is a function rather than a
`Mock` you lose the other capabilities of `Mock`, like dynamic attribute
creation.
mocksignature with callable objects
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When used with a callable object `mocksignature` copies the signature of the
`__call__` method.
.. doctest::
>>> class Something(object):
... def __call__(self, spam, eggs):
... pass
...
>>> something = Something()
>>> mock_something = mocksignature(something)
>>> result = mock_something(10, 9)
>>> mock_something.assert_called_with(10, 9)
>>> mock_something()
Traceback (most recent call last):
...
TypeError: <lambda>() takes at least 2 arguments (0 given)
mocksignature argument to patch
-------------------------------
`mocksignature` is available as a keyword argument to :func:`patch` or
:func:`patch.object`. It can be used with functions / methods / classes and
callable objects.
.. doctest::
>>> class SomeClass(object):
... def method(self, a, b, c=None):
... pass
...
>>> @patch.object(SomeClass, 'method', mocksignature=True)
... def test(mock_method):
... instance = SomeClass()
... mock_method.return_value = None
... instance.method(1, 2)
... mock_method.assert_called_with(instance, 1, 2, None)
...
>>> test()

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==================
Patch Decorators
==================
.. currentmodule:: mock
.. testsetup::
class SomeClass(object):
static_method = None
class_method = None
attribute = None
sys.modules['package'] = package = Mock(name='package')
sys.modules['package.module'] = package.module
class TestCase(unittest2.TestCase):
def run(self):
result = unittest2.TestResult()
super(unittest2.TestCase, self).run(result)
assert result.wasSuccessful()
.. testcleanup::
patch.TEST_PREFIX = 'test'
The patch decorators are used for patching objects only within the scope of
the function they decorate. They automatically handle the unpatching for you,
even if exceptions are raised. All of these functions can also be used in with
statements or as class decorators.
patch
=====
.. note::
`patch` is straightforward to use. The key is to do the patching in the
right namespace. See the section `where to patch`_.
.. function:: patch(target, new=DEFAULT, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)
`patch` acts as a function decorator, class decorator or a context
manager. Inside the body of the function or with statement, the `target`
is patched with a `new` object. When the function/with statement exits
the patch is undone.
If `new` is omitted, then the target is replaced with a
:class:`MagicMock`. If `patch` is used as a decorator and `new` is
omitted, the created mock is passed in as an extra argument to the
decorated function. If `patch` is used as a context manager the created
mock is returned by the context manager.
`target` should be a string in the form `'package.module.ClassName'`. The
`target` is imported and the specified object replaced with the `new`
object, so the `target` must be importable from the environment you are
calling `patch` from. The target is imported when the decorated function
is executed, not at decoration time.
The `spec` and `spec_set` keyword arguments are passed to the `MagicMock`
if patch is creating one for you.
In addition you can pass `spec=True` or `spec_set=True`, which causes
patch to pass in the object being mocked as the spec/spec_set object.
`new_callable` allows you to specify a different class, or callable object,
that will be called to create the `new` object. By default `MagicMock` is
used.
A more powerful form of `spec` is `autospec`. If you set `autospec=True`
then the mock with be created with a spec from the object being replaced.
All attributes of the mock will also have the spec of the corresponding
attribute of the object being replaced. Methods and functions being mocked
will have their arguments checked and will raise a `TypeError` if they are
called with the wrong signature. For mocks
replacing a class, their return value (the 'instance') will have the same
spec as the class. See the :func:`create_autospec` function and
:ref:`auto-speccing`.
Instead of `autospec=True` you can pass `autospec=some_object` to use an
arbitrary object as the spec instead of the one being replaced.
By default `patch` will fail to replace attributes that don't exist. If
you pass in `create=True`, and the attribute doesn't exist, patch will
create the attribute for you when the patched function is called, and
delete it again afterwards. This is useful for writing tests against
attributes that your production code creates at runtime. It is off by by
default because it can be dangerous. With it switched on you can write
passing tests against APIs that don't actually exist!
Patch can be used as a `TestCase` class decorator. It works by
decorating each test method in the class. This reduces the boilerplate
code when your test methods share a common patchings set. `patch` finds
tests by looking for method names that start with `patch.TEST_PREFIX`.
By default this is `test`, which matches the way `unittest` finds tests.
You can specify an alternative prefix by setting `patch.TEST_PREFIX`.
Patch can be used as a context manager, with the with statement. Here the
patching applies to the indented block after the with statement. If you
use "as" then the patched object will be bound to the name after the
"as"; very useful if `patch` is creating a mock object for you.
`patch` takes arbitrary keyword arguments. These will be passed to
the `Mock` (or `new_callable`) on construction.
`patch.dict(...)`, `patch.multiple(...)` and `patch.object(...)` are
available for alternate use-cases.
`patch` as function decorator, creating the mock for you and passing it into
the decorated function:
.. doctest::
>>> @patch('__main__.SomeClass')
... def function(normal_argument, mock_class):
... print mock_class is SomeClass
...
>>> function(None)
True
Patching a class replaces the class with a `MagicMock` *instance*. If the
class is instantiated in the code under test then it will be the
:attr:`~Mock.return_value` of the mock that will be used.
If the class is instantiated multiple times you could use
:attr:`~Mock.side_effect` to return a new mock each time. Alternatively you
can set the `return_value` to be anything you want.
To configure return values on methods of *instances* on the patched class
you must do this on the `return_value`. For example:
.. doctest::
>>> class Class(object):
... def method(self):
... pass
...
>>> with patch('__main__.Class') as MockClass:
... instance = MockClass.return_value
... instance.method.return_value = 'foo'
... assert Class() is instance
... assert Class().method() == 'foo'
...
If you use `spec` or `spec_set` and `patch` is replacing a *class*, then the
return value of the created mock will have the same spec.
.. doctest::
>>> Original = Class
>>> patcher = patch('__main__.Class', spec=True)
>>> MockClass = patcher.start()
>>> instance = MockClass()
>>> assert isinstance(instance, Original)
>>> patcher.stop()
The `new_callable` argument is useful where you want to use an alternative
class to the default :class:`MagicMock` for the created mock. For example, if
you wanted a :class:`NonCallableMock` to be used:
.. doctest::
>>> thing = object()
>>> with patch('__main__.thing', new_callable=NonCallableMock) as mock_thing:
... assert thing is mock_thing
... thing()
...
Traceback (most recent call last):
...
TypeError: 'NonCallableMock' object is not callable
Another use case might be to replace an object with a `StringIO` instance:
.. doctest::
>>> from StringIO import StringIO
>>> def foo():
... print 'Something'
...
>>> @patch('sys.stdout', new_callable=StringIO)
... def test(mock_stdout):
... foo()
... assert mock_stdout.getvalue() == 'Something\n'
...
>>> test()
When `patch` is creating a mock for you, it is common that the first thing
you need to do is to configure the mock. Some of that configuration can be done
in the call to patch. Any arbitrary keywords you pass into the call will be
used to set attributes on the created mock:
.. doctest::
>>> patcher = patch('__main__.thing', first='one', second='two')
>>> mock_thing = patcher.start()
>>> mock_thing.first
'one'
>>> mock_thing.second
'two'
As well as attributes on the created mock attributes, like the
:attr:`~Mock.return_value` and :attr:`~Mock.side_effect`, of child mocks can
also be configured. These aren't syntactically valid to pass in directly as
keyword arguments, but a dictionary with these as keys can still be expanded
into a `patch` call using `**`:
.. doctest::
>>> config = {'method.return_value': 3, 'other.side_effect': KeyError}
>>> patcher = patch('__main__.thing', **config)
>>> mock_thing = patcher.start()
>>> mock_thing.method()
3
>>> mock_thing.other()
Traceback (most recent call last):
...
KeyError
patch.object
============
.. function:: patch.object(target, attribute, new=DEFAULT, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)
patch the named member (`attribute`) on an object (`target`) with a mock
object.
`patch.object` can be used as a decorator, class decorator or a context
manager. Arguments `new`, `spec`, `create`, `spec_set`, `autospec` and
`new_callable` have the same meaning as for `patch`. Like `patch`,
`patch.object` takes arbitrary keyword arguments for configuring the mock
object it creates.
When used as a class decorator `patch.object` honours `patch.TEST_PREFIX`
for choosing which methods to wrap.
You can either call `patch.object` with three arguments or two arguments. The
three argument form takes the object to be patched, the attribute name and the
object to replace the attribute with.
When calling with the two argument form you omit the replacement object, and a
mock is created for you and passed in as an extra argument to the decorated
function:
.. doctest::
>>> @patch.object(SomeClass, 'class_method')
... def test(mock_method):
... SomeClass.class_method(3)
... mock_method.assert_called_with(3)
...
>>> test()
`spec`, `create` and the other arguments to `patch.object` have the same
meaning as they do for `patch`.
patch.dict
==========
.. function:: patch.dict(in_dict, values=(), clear=False, **kwargs)
Patch a dictionary, or dictionary like object, and restore the dictionary
to its original state after the test.
`in_dict` can be a dictionary or a mapping like container. If it is a
mapping then it must at least support getting, setting and deleting items
plus iterating over keys.
`in_dict` can also be a string specifying the name of the dictionary, which
will then be fetched by importing it.
`values` can be a dictionary of values to set in the dictionary. `values`
can also be an iterable of `(key, value)` pairs.
If `clear` is True then the dictionary will be cleared before the new
values are set.
`patch.dict` can also be called with arbitrary keyword arguments to set
values in the dictionary.
`patch.dict` can be used as a context manager, decorator or class
decorator. When used as a class decorator `patch.dict` honours
`patch.TEST_PREFIX` for choosing which methods to wrap.
`patch.dict` can be used to add members to a dictionary, or simply let a test
change a dictionary, and ensure the dictionary is restored when the test
ends.
.. doctest::
>>> from mock import patch
>>> foo = {}
>>> with patch.dict(foo, {'newkey': 'newvalue'}):
... assert foo == {'newkey': 'newvalue'}
...
>>> assert foo == {}
>>> import os
>>> with patch.dict('os.environ', {'newkey': 'newvalue'}):
... print os.environ['newkey']
...
newvalue
>>> assert 'newkey' not in os.environ
Keywords can be used in the `patch.dict` call to set values in the dictionary:
.. doctest::
>>> mymodule = MagicMock()
>>> mymodule.function.return_value = 'fish'
>>> with patch.dict('sys.modules', mymodule=mymodule):
... import mymodule
... mymodule.function('some', 'args')
...
'fish'
`patch.dict` can be used with dictionary like objects that aren't actually
dictionaries. At the very minimum they must support item getting, setting,
deleting and either iteration or membership test. This corresponds to the
magic methods `__getitem__`, `__setitem__`, `__delitem__` and either
`__iter__` or `__contains__`.
.. doctest::
>>> class Container(object):
... def __init__(self):
... self.values = {}
... def __getitem__(self, name):
... return self.values[name]
... def __setitem__(self, name, value):
... self.values[name] = value
... def __delitem__(self, name):
... del self.values[name]
... def __iter__(self):
... return iter(self.values)
...
>>> thing = Container()
>>> thing['one'] = 1
>>> with patch.dict(thing, one=2, two=3):
... assert thing['one'] == 2
... assert thing['two'] == 3
...
>>> assert thing['one'] == 1
>>> assert list(thing) == ['one']
patch.multiple
==============
.. function:: patch.multiple(target, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)
Perform multiple patches in a single call. It takes the object to be
patched (either as an object or a string to fetch the object by importing)
and keyword arguments for the patches::
with patch.multiple(settings, FIRST_PATCH='one', SECOND_PATCH='two'):
...
Use :data:`DEFAULT` as the value if you want `patch.multiple` to create
mocks for you. In this case the created mocks are passed into a decorated
function by keyword, and a dictionary is returned when `patch.multiple` is
used as a context manager.
`patch.multiple` can be used as a decorator, class decorator or a context
manager. The arguments `spec`, `spec_set`, `create`, `autospec` and
`new_callable` have the same meaning as for `patch`. These arguments will
be applied to *all* patches done by `patch.multiple`.
When used as a class decorator `patch.multiple` honours `patch.TEST_PREFIX`
for choosing which methods to wrap.
If you want `patch.multiple` to create mocks for you, then you can use
:data:`DEFAULT` as the value. If you use `patch.multiple` as a decorator
then the created mocks are passed into the decorated function by keyword.
.. doctest::
>>> thing = object()
>>> other = object()
>>> @patch.multiple('__main__', thing=DEFAULT, other=DEFAULT)
... def test_function(thing, other):
... assert isinstance(thing, MagicMock)
... assert isinstance(other, MagicMock)
...
>>> test_function()
`patch.multiple` can be nested with other `patch` decorators, but put arguments
passed by keyword *after* any of the standard arguments created by `patch`:
.. doctest::
>>> @patch('sys.exit')
... @patch.multiple('__main__', thing=DEFAULT, other=DEFAULT)
... def test_function(mock_exit, other, thing):
... assert 'other' in repr(other)
... assert 'thing' in repr(thing)
... assert 'exit' in repr(mock_exit)
...
>>> test_function()
If `patch.multiple` is used as a context manager, the value returned by the
context manger is a dictionary where created mocks are keyed by name:
.. doctest::
>>> with patch.multiple('__main__', thing=DEFAULT, other=DEFAULT) as values:
... assert 'other' in repr(values['other'])
... assert 'thing' in repr(values['thing'])
... assert values['thing'] is thing
... assert values['other'] is other
...
.. _start-and-stop:
patch methods: start and stop
=============================
All the patchers have `start` and `stop` methods. These make it simpler to do
patching in `setUp` methods or where you want to do multiple patches without
nesting decorators or with statements.
To use them call `patch`, `patch.object` or `patch.dict` as normal and keep a
reference to the returned `patcher` object. You can then call `start` to put
the patch in place and `stop` to undo it.
If you are using `patch` to create a mock for you then it will be returned by
the call to `patcher.start`.
.. doctest::
>>> patcher = patch('package.module.ClassName')
>>> from package import module
>>> original = module.ClassName
>>> new_mock = patcher.start()
>>> assert module.ClassName is not original
>>> assert module.ClassName is new_mock
>>> patcher.stop()
>>> assert module.ClassName is original
>>> assert module.ClassName is not new_mock
A typical use case for this might be for doing multiple patches in the `setUp`
method of a `TestCase`:
.. doctest::
>>> class MyTest(TestCase):
... def setUp(self):
... self.patcher1 = patch('package.module.Class1')
... self.patcher2 = patch('package.module.Class2')
... self.MockClass1 = self.patcher1.start()
... self.MockClass2 = self.patcher2.start()
...
... def tearDown(self):
... self.patcher1.stop()
... self.patcher2.stop()
...
... def test_something(self):
... assert package.module.Class1 is self.MockClass1
... assert package.module.Class2 is self.MockClass2
...
>>> MyTest('test_something').run()
.. caution::
If you use this technique you must ensure that the patching is "undone" by
calling `stop`. This can be fiddlier than you might think, because if an
exception is raised in the setUp then tearDown is not called. `unittest2
<http://pypi.python.org/pypi/unittest2>`_ cleanup functions make this
easier.
.. doctest::
>>> class MyTest(TestCase):
... def setUp(self):
... patcher = patch('package.module.Class')
... self.MockClass = patcher.start()
... self.addCleanup(patcher.stop)
...
... def test_something(self):
... assert package.module.Class is self.MockClass
...
>>> MyTest('test_something').run()
As an added bonus you no longer need to keep a reference to the `patcher`
object.
It is also possible to stop all patches which have been started by using
`patch.stopall`.
.. function:: patch.stopall
Stop all active patches. Only stops patches started with `start`.
TEST_PREFIX
===========
All of the patchers can be used as class decorators. When used in this way
they wrap every test method on the class. The patchers recognise methods that
start with `test` as being test methods. This is the same way that the
`unittest.TestLoader` finds test methods by default.
It is possible that you want to use a different prefix for your tests. You can
inform the patchers of the different prefix by setting `patch.TEST_PREFIX`:
.. doctest::
>>> patch.TEST_PREFIX = 'foo'
>>> value = 3
>>>
>>> @patch('__main__.value', 'not three')
... class Thing(object):
... def foo_one(self):
... print value
... def foo_two(self):
... print value
...
>>>
>>> Thing().foo_one()
not three
>>> Thing().foo_two()
not three
>>> value
3
Nesting Patch Decorators
========================
If you want to perform multiple patches then you can simply stack up the
decorators.
You can stack up multiple patch decorators using this pattern:
.. doctest::
>>> @patch.object(SomeClass, 'class_method')
... @patch.object(SomeClass, 'static_method')
... def test(mock1, mock2):
... assert SomeClass.static_method is mock1
... assert SomeClass.class_method is mock2
... SomeClass.static_method('foo')
... SomeClass.class_method('bar')
... return mock1, mock2
...
>>> mock1, mock2 = test()
>>> mock1.assert_called_once_with('foo')
>>> mock2.assert_called_once_with('bar')
Note that the decorators are applied from the bottom upwards. This is the
standard way that Python applies decorators. The order of the created mocks
passed into your test function matches this order.
Like all context-managers patches can be nested using contextlib's nested
function; *every* patching will appear in the tuple after "as":
.. doctest::
>>> from contextlib import nested
>>> with nested(
... patch('package.module.ClassName1'),
... patch('package.module.ClassName2')
... ) as (MockClass1, MockClass2):
... assert package.module.ClassName1 is MockClass1
... assert package.module.ClassName2 is MockClass2
...
.. _where-to-patch:
Where to patch
==============
`patch` works by (temporarily) changing the object that a *name* points to with
another one. There can be many names pointing to any individual object, so
for patching to work you must ensure that you patch the name used by the system
under test.
The basic principle is that you patch where an object is *looked up*, which
is not necessarily the same place as where it is defined. A couple of
examples will help to clarify this.
Imagine we have a project that we want to test with the following structure::
a.py
-> Defines SomeClass
b.py
-> from a import SomeClass
-> some_function instantiates SomeClass
Now we want to test `some_function` but we want to mock out `SomeClass` using
`patch`. The problem is that when we import module b, which we will have to
do then it imports `SomeClass` from module a. If we use `patch` to mock out
`a.SomeClass` then it will have no effect on our test; module b already has a
reference to the *real* `SomeClass` and it looks like our patching had no
effect.
The key is to patch out `SomeClass` where it is used (or where it is looked up
). In this case `some_function` will actually look up `SomeClass` in module b,
where we have imported it. The patching should look like:
`@patch('b.SomeClass')`
However, consider the alternative scenario where instead of `from a import
SomeClass` module b does `import a` and `some_function` uses `a.SomeClass`. Both
of these import forms are common. In this case the class we want to patch is
being looked up on the a module and so we have to patch `a.SomeClass` instead:
`@patch('a.SomeClass')`
Patching Descriptors and Proxy Objects
======================================
Since version 0.6.0 both patch_ and patch.object_ have been able to correctly
patch and restore descriptors: class methods, static methods and properties.
You should patch these on the *class* rather than an instance.
Since version 0.7.0 patch_ and patch.object_ work correctly with some objects
that proxy attribute access, like the `django setttings object
<http://www.voidspace.org.uk/python/weblog/arch_d7_2010_12_04.shtml#e1198>`_.
.. note::
In django `import settings` and `from django.conf import settings`
return different objects. If you are using libraries / apps that do both you
may have to patch both. Grrr...

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==========
Sentinel
==========
.. currentmodule:: mock
.. testsetup::
class ProductionClass(object):
def something(self):
return self.method()
class Test(unittest2.TestCase):
def testSomething(self):
pass
self = Test('testSomething')
.. data:: sentinel
The ``sentinel`` object provides a convenient way of providing unique
objects for your tests.
Attributes are created on demand when you access them by name. Accessing
the same attribute will always return the same object. The objects
returned have a sensible repr so that test failure messages are readable.
.. data:: DEFAULT
The `DEFAULT` object is a pre-created sentinel (actually
`sentinel.DEFAULT`). It can be used by :attr:`~Mock.side_effect`
functions to indicate that the normal return value should be used.
Sentinel Example
================
Sometimes when testing you need to test that a specific object is passed as an
argument to another method, or returned. It can be common to create named
sentinel objects to test this. `sentinel` provides a convenient way of
creating and testing the identity of objects like this.
In this example we monkey patch `method` to return
`sentinel.some_object`:
.. doctest::
>>> real = ProductionClass()
>>> real.method = Mock(name="method")
>>> real.method.return_value = sentinel.some_object
>>> result = real.method()
>>> assert result is sentinel.some_object
>>> sentinel.some_object
sentinel.some_object

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}
/* -- admonitions ----------------------------------------------------------- */
.admonition {
border: 1px solid #a1a5a9;
background-color: #f7f7f7;
margin: 20px;
padding: 0px 8px 7px 9px;
text-align: left;
}
.warning {
background-color:#E8E8E8;
border:1px solid #111111;
margin:30px;
}
.admonition p {
font: 12px 'Lucida Grande', Geneva, Helvetica, Arial, sans-serif;
margin-top: 7px;
margin-bottom: 0px;
}
div.admonition dt {
font-weight: bold;
}
div.admonition dl {
margin-bottom: 0;
}
p.admonition-title {
margin: 0px 10px 5px 0px;
font-weight: bold;
padding-top: 3px;
}
div.body p.centered {
text-align: center;
margin-top: 25px;
}
/* -- tables ---------------------------------------------------------------- */
table.docutils {
border-collapse: collapse;
border-top: 1px solid #919699;
border-left: 1px solid #919699;
border-right: 1px solid #919699;
font-size:12px;
padding:8px;
text-align:left;
vertical-align:top;
}
table.docutils td, table.docutils th {
padding: 8px;
font-size: 12px;
text-align: left;
vertical-align: top;
border-bottom: 1px solid #919699;
}
table.docutils th {
font-weight: bold;
}
/* This alternates colors in up to six table rows (light blue for odd, white for even)*/
.docutils tr {
background: #F0F5F9;
}
.docutils tr + tr {
background: #FFFFFF;
}
.docutils tr + tr + tr {
background: #F0F5F9;
}
.docutils tr + tr + tr + tr {
background: #FFFFFF;
}
.docutils tr + tr + tr +tr + tr {
background: #F0F5F9;
}
.docutils tr + tr + tr + tr + tr + tr {
background: #FFFFFF;
}
.docutils tr + tr + tr + tr + tr + tr + tr {
background: #F0F5F9;
}
table.footnote td, table.footnote th {
border: 0 !important;
}
th {
text-align: left;
padding-right: 5px;
}
/* -- other body styles ----------------------------------------------------- */
dl {
margin-bottom: 15px;
}
dd p {
margin-top: 0px;
font-size: 12px;
}
dd ul, dd table {
margin-bottom: 10px;
}
dd {
margin-top: 3px;
margin-bottom: 10px;
margin-left: 30px;
font-size: 12px;
}
dt:target, .highlight {
background-color: #fbe54e;
}
dl.glossary dt {
font-weight: bold;
font-size: 0.8em;
}
dl.glossary dd {
font-size:12px;
}
.field-list ul {
vertical-align: top;
margin: 0;
padding-bottom: 0;
list-style: none inside;
}
.field-list ul li {
margin-top: 0;
}
.field-list p {
margin: 0;
}
.refcount {
color: #060;
}
.optional {
font-size: 1.3em;
}
.versionmodified {
font-style: italic;
}
.system-message {
background-color: #fda;
padding: 5px;
border: 3px solid red;
}
.footnote:target {
background-color: #ffa
}
/* -- code displays --------------------------------------------------------- */
pre {
overflow: auto;
background-color:#F1F5F9;
border:1px solid #C9D1D7;
border-spacing:0;
font-family:"Bitstream Vera Sans Mono",Monaco,"Lucida Console",Courier,Consolas,monospace;
font-size:11px;
padding: 10px;
}
td.linenos pre {
padding: 5px 0px;
border: 0;
background-color: transparent;
color: #aaa;
}
table.highlighttable {
margin-left: 0.5em;
}
table.highlighttable td {
padding: 0 0.5em 0 0.5em;
}
tt {
font-family:"Bitstream Vera Sans Mono",Monaco,"Lucida Console",Courier,Consolas,monospace;
}
tt.descname {
background-color: transparent;
font-weight: bold;
font-size: 1em;
}
tt.descclassname {
background-color: transparent;
}
tt.xref, a tt {
background-color: transparent;
font-weight: bold;
}
h1 tt, h2 tt, h3 tt, h4 tt, h5 tt, h6 tt {
background-color: transparent;
}
/* -- math display ---------------------------------------------------------- */
img.math {
vertical-align: middle;
}
div.body div.math p {
text-align: center;
}
span.eqno {
float: right;
}
/* -- printout stylesheet --------------------------------------------------- */
@media print {
div.document,
div.documentwrapper,
div.bodywrapper {
margin: 0;
width: 100%;
}
div.sphinxsidebar,
div.related,
div.footer,
#top-link {
display: none;
}
}
body {
font-family:'Lucida Grande',Geneva,Helvetica,Arial,sans-serif;
}
dl.class dt {
padding: 3px;
/* border-top: 2px solid #999;*/
}
em.property {
font-style: normal;
}
dl.class dd p {
margin-top: 6px;
}
dl.class dd dl.exception dt {
padding: 3px;
background-color: #FFD6D6;
border-top: none;
}
dl.class dd dl.method dt {
padding: 3px;
background-color: #e9e9e9;
border-top: none;
}
dl.function dt {
padding: 3px;
border-top: 2px solid #999;
}
ul {
list-style-image:none;
list-style-position:outside;
list-style-type:square;
margin:0 0 0 30px;
padding:0 0 12px 6px;
}
#docstitle {
height: 36px;
background-image: url(header_sm_mid.png);
left: 0;
top: 0;
position: absolute;
width: 100%;
}
#docstitle p {
padding:7px 0 0 45px;
margin: 0;
color: white;
text-shadow:0 1px 0 #787878;
background: transparent url(documentation.png) no-repeat scroll 10px 3px;
height: 36px;
font-size: 15px;
}
#header {
height:45px;
left:0;
position:absolute;
right:0;
top:36px;
z-index:900;
}
#header h1 {
font-size:10pt;
margin:0;
padding:5px 0 0 10px;
text-shadow:0 1px 0 #D5D5D5;
white-space:nowrap;
}
h1 {
-x-system-font:none;
color:#000000;
font-family:'Lucida Grande',Geneva,Helvetica,Arial,sans-serif;
font-size:30px;
font-size-adjust:none;
font-stretch:normal;
font-style:normal;
font-variant:normal;
font-weight:bold;
line-height:normal;
margin-bottom:25px;
margin-top:1em;
}
.footer {
border-top:1px solid #DDDDDD;
clear:both;
padding-top:9px;
width:100%;
font-size:10px;
}
p {
-x-system-font:none;
font-family:'Lucida Grande',Geneva,Helvetica,Arial,sans-serif;
font-size:12px;
font-size-adjust:none;
font-stretch:normal;
font-style:normal;
font-variant:normal;
font-weight:normal;
line-height:normal;
margin-bottom:10px;
margin-top:0;
}
h2 {
border-bottom:1px solid #919699;
color:#000000;
font-size:24px;
margin-top:2.5em;
padding-bottom:2px;
}
a:link:hover {
color:#093D92;
text-decoration:underline;
}
a:link {
color:#093D92;
text-decoration:none;
}
ol {
list-style-position:outside;
list-style-type:decimal;
margin:0 0 0 30px;
padding:0 0 12px 6px;
}
li {
margin-top:7px;
font-family:'Lucida Grande',Geneva,Helvetica,Arial,sans-serif;
font-size:12px;
font-size-adjust:none;
font-stretch:normal;
font-style:normal;
font-variant:normal;
font-weight:normal;
line-height:normal;
}
li p {
margin-top:8px;
}

540
third_party/python/mock-1.0.0/html/_static/basic.css поставляемый
Просмотреть файл

@ -1,540 +0,0 @@
/*
* basic.css
* ~~~~~~~~~
*
* Sphinx stylesheet -- basic theme.
*
* :copyright: Copyright 2007-2011 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
/* -- main layout ----------------------------------------------------------- */
div.clearer {
clear: both;
}
/* -- relbar ---------------------------------------------------------------- */
div.related {
width: 100%;
font-size: 90%;
}
div.related h3 {
display: none;
}
div.related ul {
margin: 0;
padding: 0 0 0 10px;
list-style: none;
}
div.related li {
display: inline;
}
div.related li.right {
float: right;
margin-right: 5px;
}
/* -- sidebar --------------------------------------------------------------- */
div.sphinxsidebarwrapper {
padding: 10px 5px 0 10px;
}
div.sphinxsidebar {
float: left;
width: 230px;
margin-left: -100%;
font-size: 90%;
}
div.sphinxsidebar ul {
list-style: none;
}
div.sphinxsidebar ul ul,
div.sphinxsidebar ul.want-points {
margin-left: 20px;
list-style: square;
}
div.sphinxsidebar ul ul {
margin-top: 0;
margin-bottom: 0;
}
div.sphinxsidebar form {
margin-top: 10px;
}
div.sphinxsidebar input {
border: 1px solid #98dbcc;
font-family: sans-serif;
font-size: 1em;
}
div.sphinxsidebar #searchbox input[type="text"] {
width: 170px;
}
div.sphinxsidebar #searchbox input[type="submit"] {
width: 30px;
}
img {
border: 0;
}
/* -- search page ----------------------------------------------------------- */
ul.search {
margin: 10px 0 0 20px;
padding: 0;
}
ul.search li {
padding: 5px 0 5px 20px;
background-image: url(file.png);
background-repeat: no-repeat;
background-position: 0 7px;
}
ul.search li a {
font-weight: bold;
}
ul.search li div.context {
color: #888;
margin: 2px 0 0 30px;
text-align: left;
}
ul.keywordmatches li.goodmatch a {
font-weight: bold;
}
/* -- index page ------------------------------------------------------------ */
table.contentstable {
width: 90%;
}
table.contentstable p.biglink {
line-height: 150%;
}
a.biglink {
font-size: 1.3em;
}
span.linkdescr {
font-style: italic;
padding-top: 5px;
font-size: 90%;
}
/* -- general index --------------------------------------------------------- */
table.indextable {
width: 100%;
}
table.indextable td {
text-align: left;
vertical-align: top;
}
table.indextable dl, table.indextable dd {
margin-top: 0;
margin-bottom: 0;
}
table.indextable tr.pcap {
height: 10px;
}
table.indextable tr.cap {
margin-top: 10px;
background-color: #f2f2f2;
}
img.toggler {
margin-right: 3px;
margin-top: 3px;
cursor: pointer;
}
div.modindex-jumpbox {
border-top: 1px solid #ddd;
border-bottom: 1px solid #ddd;
margin: 1em 0 1em 0;
padding: 0.4em;
}
div.genindex-jumpbox {
border-top: 1px solid #ddd;
border-bottom: 1px solid #ddd;
margin: 1em 0 1em 0;
padding: 0.4em;
}
/* -- general body styles --------------------------------------------------- */
a.headerlink {
visibility: hidden;
}
h1:hover > a.headerlink,
h2:hover > a.headerlink,
h3:hover > a.headerlink,
h4:hover > a.headerlink,
h5:hover > a.headerlink,
h6:hover > a.headerlink,
dt:hover > a.headerlink {
visibility: visible;
}
div.body p.caption {
text-align: inherit;
}
div.body td {
text-align: left;
}
.field-list ul {
padding-left: 1em;
}
.first {
margin-top: 0 !important;
}
p.rubric {
margin-top: 30px;
font-weight: bold;
}
img.align-left, .figure.align-left, object.align-left {
clear: left;
float: left;
margin-right: 1em;
}
img.align-right, .figure.align-right, object.align-right {
clear: right;
float: right;
margin-left: 1em;
}
img.align-center, .figure.align-center, object.align-center {
display: block;
margin-left: auto;
margin-right: auto;
}
.align-left {
text-align: left;
}
.align-center {
text-align: center;
}
.align-right {
text-align: right;
}
/* -- sidebars -------------------------------------------------------------- */
div.sidebar {
margin: 0 0 0.5em 1em;
border: 1px solid #ddb;
padding: 7px 7px 0 7px;
background-color: #ffe;
width: 40%;
float: right;
}
p.sidebar-title {
font-weight: bold;
}
/* -- topics ---------------------------------------------------------------- */
div.topic {
border: 1px solid #ccc;
padding: 7px 7px 0 7px;
margin: 10px 0 10px 0;
}
p.topic-title {
font-size: 1.1em;
font-weight: bold;
margin-top: 10px;
}
/* -- admonitions ----------------------------------------------------------- */
div.admonition {
margin-top: 10px;
margin-bottom: 10px;
padding: 7px;
}
div.admonition dt {
font-weight: bold;
}
div.admonition dl {
margin-bottom: 0;
}
p.admonition-title {
margin: 0px 10px 5px 0px;
font-weight: bold;
}
div.body p.centered {
text-align: center;
margin-top: 25px;
}
/* -- tables ---------------------------------------------------------------- */
table.docutils {
border: 0;
border-collapse: collapse;
}
table.docutils td, table.docutils th {
padding: 1px 8px 1px 5px;
border-top: 0;
border-left: 0;
border-right: 0;
border-bottom: 1px solid #aaa;
}
table.field-list td, table.field-list th {
border: 0 !important;
}
table.footnote td, table.footnote th {
border: 0 !important;
}
th {
text-align: left;
padding-right: 5px;
}
table.citation {
border-left: solid 1px gray;
margin-left: 1px;
}
table.citation td {
border-bottom: none;
}
/* -- other body styles ----------------------------------------------------- */
ol.arabic {
list-style: decimal;
}
ol.loweralpha {
list-style: lower-alpha;
}
ol.upperalpha {
list-style: upper-alpha;
}
ol.lowerroman {
list-style: lower-roman;
}
ol.upperroman {
list-style: upper-roman;
}
dl {
margin-bottom: 15px;
}
dd p {
margin-top: 0px;
}
dd ul, dd table {
margin-bottom: 10px;
}
dd {
margin-top: 3px;
margin-bottom: 10px;
margin-left: 30px;
}
dt:target, .highlighted {
background-color: #fbe54e;
}
dl.glossary dt {
font-weight: bold;
font-size: 1.1em;
}
.field-list ul {
margin: 0;
padding-left: 1em;
}
.field-list p {
margin: 0;
}
.refcount {
color: #060;
}
.optional {
font-size: 1.3em;
}
.versionmodified {
font-style: italic;
}
.system-message {
background-color: #fda;
padding: 5px;
border: 3px solid red;
}
.footnote:target {
background-color: #ffa;
}
.line-block {
display: block;
margin-top: 1em;
margin-bottom: 1em;
}
.line-block .line-block {
margin-top: 0;
margin-bottom: 0;
margin-left: 1.5em;
}
.guilabel, .menuselection {
font-family: sans-serif;
}
.accelerator {
text-decoration: underline;
}
.classifier {
font-style: oblique;
}
abbr, acronym {
border-bottom: dotted 1px;
cursor: help;
}
/* -- code displays --------------------------------------------------------- */
pre {
overflow: auto;
overflow-y: hidden; /* fixes display issues on Chrome browsers */
}
td.linenos pre {
padding: 5px 0px;
border: 0;
background-color: transparent;
color: #aaa;
}
table.highlighttable {
margin-left: 0.5em;
}
table.highlighttable td {
padding: 0 0.5em 0 0.5em;
}
tt.descname {
background-color: transparent;
font-weight: bold;
font-size: 1.2em;
}
tt.descclassname {
background-color: transparent;
}
tt.xref, a tt {
background-color: transparent;
font-weight: bold;
}
h1 tt, h2 tt, h3 tt, h4 tt, h5 tt, h6 tt {
background-color: transparent;
}
.viewcode-link {
float: right;
}
.viewcode-back {
float: right;
font-family: sans-serif;
}
div.viewcode-block:target {
margin: -1px -10px;
padding: 0 10px;
}
/* -- math display ---------------------------------------------------------- */
img.math {
vertical-align: middle;
}
div.body div.math p {
text-align: center;
}
span.eqno {
float: right;
}
/* -- printout stylesheet --------------------------------------------------- */
@media print {
div.document,
div.documentwrapper,
div.bodywrapper {
margin: 0 !important;
width: 100%;
}
div.sphinxsidebar,
div.related,
div.footer,
#top-link {
display: none;
}
}

Двоичные данные
third_party/python/mock-1.0.0/html/_static/breadcrumb_background.png поставляемый
Просмотреть файл

Двоичный файл не отображается.
Режим "рядом"

До

Ширина:  |  Высота:  |  Размер: 136 B

256
third_party/python/mock-1.0.0/html/_static/default.css поставляемый
Просмотреть файл

@ -1,256 +0,0 @@
/*
* default.css_t
* ~~~~~~~~~~~~~
*
* Sphinx stylesheet -- default theme.
*
* :copyright: Copyright 2007-2010 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
@import url("basic.css");
/* -- page layout ----------------------------------------------------------- */
body {
font-family: sans-serif;
font-size: 100%;
background-color: #11303d;
color: #000;
margin: 0;
padding: 0;
}
div.document {
background-color: #1c4e63;
}
div.documentwrapper {
float: left;
width: 100%;
}
div.bodywrapper {
margin: 0 0 0 230px;
}
div.body {
background-color: #ffffff;
color: #000000;
padding: 0 20px 30px 20px;
}
div.footer {
color: #ffffff;
width: 100%;
padding: 9px 0 9px 0;
text-align: center;
font-size: 75%;
}
div.footer a {
color: #ffffff;
text-decoration: underline;
}
div.related {
background-color: #133f52;
line-height: 30px;
color: #ffffff;
}
div.related a {
color: #ffffff;
}
div.sphinxsidebar {
}
div.sphinxsidebar h3 {
font-family: 'Trebuchet MS', sans-serif;
color: #ffffff;
font-size: 1.4em;
font-weight: normal;
margin: 0;
padding: 0;
}
div.sphinxsidebar h3 a {
color: #ffffff;
}
div.sphinxsidebar h4 {
font-family: 'Trebuchet MS', sans-serif;
color: #ffffff;
font-size: 1.3em;
font-weight: normal;
margin: 5px 0 0 0;
padding: 0;
}
div.sphinxsidebar p {
color: #ffffff;
}
div.sphinxsidebar p.topless {
margin: 5px 10px 10px 10px;
}
div.sphinxsidebar ul {
margin: 10px;
padding: 0;
color: #ffffff;
}
div.sphinxsidebar a {
color: #98dbcc;
}
div.sphinxsidebar input {
border: 1px solid #98dbcc;
font-family: sans-serif;
font-size: 1em;
}
/* -- hyperlink styles ------------------------------------------------------ */
a {
color: #355f7c;
text-decoration: none;
}
a:visited {
color: #355f7c;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
/* -- body styles ----------------------------------------------------------- */
div.body h1,
div.body h2,
div.body h3,
div.body h4,
div.body h5,
div.body h6 {
font-family: 'Trebuchet MS', sans-serif;
background-color: #f2f2f2;
font-weight: normal;
color: #20435c;
border-bottom: 1px solid #ccc;
margin: 20px -20px 10px -20px;
padding: 3px 0 3px 10px;
}
div.body h1 { margin-top: 0; font-size: 200%; }
div.body h2 { font-size: 160%; }
div.body h3 { font-size: 140%; }
div.body h4 { font-size: 120%; }
div.body h5 { font-size: 110%; }
div.body h6 { font-size: 100%; }
a.headerlink {
color: #c60f0f;
font-size: 0.8em;
padding: 0 4px 0 4px;
text-decoration: none;
}
a.headerlink:hover {
background-color: #c60f0f;
color: white;
}
div.body p, div.body dd, div.body li {
text-align: justify;
line-height: 130%;
}
div.admonition p.admonition-title + p {
display: inline;
}
div.admonition p {
margin-bottom: 5px;
}
div.admonition pre {
margin-bottom: 5px;
}
div.admonition ul, div.admonition ol {
margin-bottom: 5px;
}
div.note {
background-color: #eee;
border: 1px solid #ccc;
}
div.seealso {
background-color: #ffc;
border: 1px solid #ff6;
}
div.topic {
background-color: #eee;
}
div.warning {
background-color: #ffe4e4;
border: 1px solid #f66;
}
p.admonition-title {
display: inline;
}
p.admonition-title:after {
content: ":";
}
pre {
padding: 5px;
background-color: #eeffcc;
color: #333333;
line-height: 120%;
border: 1px solid #ac9;
border-left: none;
border-right: none;
}
tt {
background-color: #ecf0f3;
padding: 0 1px 0 1px;
font-size: 0.95em;
}
th {
background-color: #ede;
}
.warning tt {
background: #efc2c2;
}
.note tt {
background: #d6d6d6;
}
.viewcode-back {
font-family: sans-serif;
}
div.viewcode-block:target {
background-color: #f4debf;
border-top: 1px solid #ac9;
border-bottom: 1px solid #ac9;
}

247
third_party/python/mock-1.0.0/html/_static/doctools.js поставляемый
Просмотреть файл

@ -1,247 +0,0 @@
/*
* doctools.js
* ~~~~~~~~~~~
*
* Sphinx JavaScript utilities for all documentation.
*
* :copyright: Copyright 2007-2011 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
/**
* select a different prefix for underscore
*/
$u = _.noConflict();
/**
* make the code below compatible with browsers without
* an installed firebug like debugger
if (!window.console || !console.firebug) {
var names = ["log", "debug", "info", "warn", "error", "assert", "dir",
"dirxml", "group", "groupEnd", "time", "timeEnd", "count", "trace",
"profile", "profileEnd"];
window.console = {};
for (var i = 0; i < names.length; ++i)
window.console[names[i]] = function() {};
}
*/
/**
* small helper function to urldecode strings
*/
jQuery.urldecode = function(x) {
return decodeURIComponent(x).replace(/\+/g, ' ');
}
/**
* small helper function to urlencode strings
*/
jQuery.urlencode = encodeURIComponent;
/**
* This function returns the parsed url parameters of the
* current request. Multiple values per key are supported,
* it will always return arrays of strings for the value parts.
*/
jQuery.getQueryParameters = function(s) {
if (typeof s == 'undefined')
s = document.location.search;
var parts = s.substr(s.indexOf('?') + 1).split('&');
var result = {};
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@ -1,154 +0,0 @@
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function(a){var b=this[0];if(a)return this.each(function(e){c.offset.setOffset(this,a,e)});if(!b||!b.ownerDocument)return null;if(b===b.ownerDocument.body)return c.offset.bodyOffset(b);var d=b.getBoundingClientRect(),f=b.ownerDocument;b=f.body;f=f.documentElement;return{top:d.top+(self.pageYOffset||c.support.boxModel&&f.scrollTop||b.scrollTop)-(f.clientTop||b.clientTop||0),left:d.left+(self.pageXOffset||c.support.boxModel&&f.scrollLeft||b.scrollLeft)-(f.clientLeft||b.clientLeft||0)}}:function(a){var b=
this[0];if(a)return this.each(function(r){c.offset.setOffset(this,a,r)});if(!b||!b.ownerDocument)return null;if(b===b.ownerDocument.body)return c.offset.bodyOffset(b);c.offset.initialize();var d=b.offsetParent,f=b,e=b.ownerDocument,j,i=e.documentElement,o=e.body;f=(e=e.defaultView)?e.getComputedStyle(b,null):b.currentStyle;for(var k=b.offsetTop,n=b.offsetLeft;(b=b.parentNode)&&b!==o&&b!==i;){if(c.offset.supportsFixedPosition&&f.position==="fixed")break;j=e?e.getComputedStyle(b,null):b.currentStyle;
k-=b.scrollTop;n-=b.scrollLeft;if(b===d){k+=b.offsetTop;n+=b.offsetLeft;if(c.offset.doesNotAddBorder&&!(c.offset.doesAddBorderForTableAndCells&&/^t(able|d|h)$/i.test(b.nodeName))){k+=parseFloat(j.borderTopWidth)||0;n+=parseFloat(j.borderLeftWidth)||0}f=d;d=b.offsetParent}if(c.offset.subtractsBorderForOverflowNotVisible&&j.overflow!=="visible"){k+=parseFloat(j.borderTopWidth)||0;n+=parseFloat(j.borderLeftWidth)||0}f=j}if(f.position==="relative"||f.position==="static"){k+=o.offsetTop;n+=o.offsetLeft}if(c.offset.supportsFixedPosition&&
f.position==="fixed"){k+=Math.max(i.scrollTop,o.scrollTop);n+=Math.max(i.scrollLeft,o.scrollLeft)}return{top:k,left:n}};c.offset={initialize:function(){var a=s.body,b=s.createElement("div"),d,f,e,j=parseFloat(c.curCSS(a,"marginTop",true))||0;c.extend(b.style,{position:"absolute",top:0,left:0,margin:0,border:0,width:"1px",height:"1px",visibility:"hidden"});b.innerHTML="<div style='position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;'><div></div></div><table style='position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;' cellpadding='0' cellspacing='0'><tr><td></td></tr></table>";
a.insertBefore(b,a.firstChild);d=b.firstChild;f=d.firstChild;e=d.nextSibling.firstChild.firstChild;this.doesNotAddBorder=f.offsetTop!==5;this.doesAddBorderForTableAndCells=e.offsetTop===5;f.style.position="fixed";f.style.top="20px";this.supportsFixedPosition=f.offsetTop===20||f.offsetTop===15;f.style.position=f.style.top="";d.style.overflow="hidden";d.style.position="relative";this.subtractsBorderForOverflowNotVisible=f.offsetTop===-5;this.doesNotIncludeMarginInBodyOffset=a.offsetTop!==j;a.removeChild(b);
c.offset.initialize=c.noop},bodyOffset:function(a){var b=a.offsetTop,d=a.offsetLeft;c.offset.initialize();if(c.offset.doesNotIncludeMarginInBodyOffset){b+=parseFloat(c.curCSS(a,"marginTop",true))||0;d+=parseFloat(c.curCSS(a,"marginLeft",true))||0}return{top:b,left:d}},setOffset:function(a,b,d){if(/static/.test(c.curCSS(a,"position")))a.style.position="relative";var f=c(a),e=f.offset(),j=parseInt(c.curCSS(a,"top",true),10)||0,i=parseInt(c.curCSS(a,"left",true),10)||0;if(c.isFunction(b))b=b.call(a,
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f.top,left:d.left-f.left}},offsetParent:function(){return this.map(function(){for(var a=this.offsetParent||s.body;a&&!/^body|html$/i.test(a.nodeName)&&c.css(a,"position")==="static";)a=a.offsetParent;return a})}});c.each(["Left","Top"],function(a,b){var d="scroll"+b;c.fn[d]=function(f){var e=this[0],j;if(!e)return null;if(f!==w)return this.each(function(){if(j=wa(this))j.scrollTo(!a?f:c(j).scrollLeft(),a?f:c(j).scrollTop());else this[d]=f});else return(j=wa(e))?"pageXOffset"in j?j[a?"pageYOffset":
"pageXOffset"]:c.support.boxModel&&j.document.documentElement[d]||j.document.body[d]:e[d]}});c.each(["Height","Width"],function(a,b){var d=b.toLowerCase();c.fn["inner"+b]=function(){return this[0]?c.css(this[0],d,false,"padding"):null};c.fn["outer"+b]=function(f){return this[0]?c.css(this[0],d,false,f?"margin":"border"):null};c.fn[d]=function(f){var e=this[0];if(!e)return f==null?null:this;if(c.isFunction(f))return this.each(function(j){var i=c(this);i[d](f.call(this,j,i[d]()))});return"scrollTo"in
e&&e.document?e.document.compatMode==="CSS1Compat"&&e.document.documentElement["client"+b]||e.document.body["client"+b]:e.nodeType===9?Math.max(e.documentElement["client"+b],e.body["scroll"+b],e.documentElement["scroll"+b],e.body["offset"+b],e.documentElement["offset"+b]):f===w?c.css(e,d):this.css(d,typeof f==="string"?f:f+"px")}});A.jQuery=A.$=c})(window);

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third_party/python/mock-1.0.0/html/_static/minus.png поставляемый
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17
third_party/python/mock-1.0.0/html/_static/mobile.css поставляемый
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@ -1,17 +0,0 @@
/*
* CSS adjustments (overrides) for mobile browsers that cannot handle
* fix-positioned div's very well.
* This makes long pages scrollable on mobile browsers.
*/
#breadcrumbs {
display: none !important;
}
.document {
bottom: inherit !important;
}
#sphinxsidebar {
bottom: inherit !important;
}

Двоичные данные
third_party/python/mock-1.0.0/html/_static/plus.png поставляемый
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62
third_party/python/mock-1.0.0/html/_static/pygments.css поставляемый
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@ -1,62 +0,0 @@
.highlight .hll { background-color: #ffffcc }
.highlight { background: #f0f0f0; }
.highlight .c { color: #60a0b0; font-style: italic } /* Comment */
.highlight .err { border: 1px solid #FF0000 } /* Error */
.highlight .k { color: #007020; font-weight: bold } /* Keyword */
.highlight .o { color: #666666 } /* Operator */
.highlight .cm { color: #60a0b0; font-style: italic } /* Comment.Multiline */
.highlight .cp { color: #007020 } /* Comment.Preproc */
.highlight .c1 { color: #60a0b0; font-style: italic } /* Comment.Single */
.highlight .cs { color: #60a0b0; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #A00000 } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #FF0000 } /* Generic.Error */
.highlight .gh { color: #000080; font-weight: bold } /* Generic.Heading */
.highlight .gi { color: #00A000 } /* Generic.Inserted */
.highlight .go { color: #808080 } /* Generic.Output */
.highlight .gp { color: #c65d09; font-weight: bold } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
.highlight .gt { color: #0040D0 } /* Generic.Traceback */
.highlight .kc { color: #007020; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #007020; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #007020; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #007020 } /* Keyword.Pseudo */
.highlight .kr { color: #007020; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #902000 } /* Keyword.Type */
.highlight .m { color: #40a070 } /* Literal.Number */
.highlight .s { color: #4070a0 } /* Literal.String */
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.highlight .nd { color: #555555; font-weight: bold } /* Name.Decorator */
.highlight .ni { color: #d55537; font-weight: bold } /* Name.Entity */
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.highlight .nv { color: #bb60d5 } /* Name.Variable */
.highlight .ow { color: #007020; font-weight: bold } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
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.highlight .mh { color: #40a070 } /* Literal.Number.Hex */
.highlight .mi { color: #40a070 } /* Literal.Number.Integer */
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.highlight .vc { color: #bb60d5 } /* Name.Variable.Class */
.highlight .vg { color: #bb60d5 } /* Name.Variable.Global */
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.highlight .il { color: #40a070 } /* Literal.Number.Integer.Long */

Двоичные данные
third_party/python/mock-1.0.0/html/_static/scrn1.png поставляемый
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Двоичный файл не отображается.
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Двоичные данные
third_party/python/mock-1.0.0/html/_static/scrn2.png поставляемый
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Двоичные данные
third_party/python/mock-1.0.0/html/_static/searchfield_leftcap.png поставляемый
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Двоичные данные
third_party/python/mock-1.0.0/html/_static/searchfield_repeat.png поставляемый
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Двоичные данные
third_party/python/mock-1.0.0/html/_static/searchfield_rightcap.png поставляемый
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560
third_party/python/mock-1.0.0/html/_static/searchtools.js поставляемый
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@ -1,560 +0,0 @@
/*
* searchtools.js_t
* ~~~~~~~~~~~~~~~~
*
* Sphinx JavaScript utilties for the full-text search.
*
* :copyright: Copyright 2007-2011 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
/**
* helper function to return a node containing the
* search summary for a given text. keywords is a list
* of stemmed words, hlwords is the list of normal, unstemmed
* words. the first one is used to find the occurance, the
* latter for highlighting it.
*/
jQuery.makeSearchSummary = function(text, keywords, hlwords) {
var textLower = text.toLowerCase();
var start = 0;
$.each(keywords, function() {
var i = textLower.indexOf(this.toLowerCase());
if (i > -1)
start = i;
});
start = Math.max(start - 120, 0);
var excerpt = ((start > 0) ? '...' : '') +
$.trim(text.substr(start, 240)) +
((start + 240 - text.length) ? '...' : '');
var rv = $('<div class="context"></div>').text(excerpt);
$.each(hlwords, function() {
rv = rv.highlightText(this, 'highlighted');
});
return rv;
}
/**
* Porter Stemmer
*/
var Stemmer = function() {
var step2list = {
ational: 'ate',
tional: 'tion',
enci: 'ence',
anci: 'ance',
izer: 'ize',
bli: 'ble',
alli: 'al',
entli: 'ent',
eli: 'e',
ousli: 'ous',
ization: 'ize',
ation: 'ate',
ator: 'ate',
alism: 'al',
iveness: 'ive',
fulness: 'ful',
ousness: 'ous',
aliti: 'al',
iviti: 'ive',
biliti: 'ble',
logi: 'log'
};
var step3list = {
icate: 'ic',
ative: '',
alize: 'al',
iciti: 'ic',
ical: 'ic',
ful: '',
ness: ''
};
var c = "[^aeiou]"; // consonant
var v = "[aeiouy]"; // vowel
var C = c + "[^aeiouy]*"; // consonant sequence
var V = v + "[aeiou]*"; // vowel sequence
var mgr0 = "^(" + C + ")?" + V + C; // [C]VC... is m>0
var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$"; // [C]VC[V] is m=1
var mgr1 = "^(" + C + ")?" + V + C + V + C; // [C]VCVC... is m>1
var s_v = "^(" + C + ")?" + v; // vowel in stem
this.stemWord = function (w) {
var stem;
var suffix;
var firstch;
var origword = w;
if (w.length < 3)
return w;
var re;
var re2;
var re3;
var re4;
firstch = w.substr(0,1);
if (firstch == "y")
w = firstch.toUpperCase() + w.substr(1);
// Step 1a
re = /^(.+?)(ss|i)es$/;
re2 = /^(.+?)([^s])s$/;
if (re.test(w))
w = w.replace(re,"$1$2");
else if (re2.test(w))
w = w.replace(re2,"$1$2");
// Step 1b
re = /^(.+?)eed$/;
re2 = /^(.+?)(ed|ing)$/;
if (re.test(w)) {
var fp = re.exec(w);
re = new RegExp(mgr0);
if (re.test(fp[1])) {
re = /.$/;
w = w.replace(re,"");
}
}
else if (re2.test(w)) {
var fp = re2.exec(w);
stem = fp[1];
re2 = new RegExp(s_v);
if (re2.test(stem)) {
w = stem;
re2 = /(at|bl|iz)$/;
re3 = new RegExp("([^aeiouylsz])\\1$");
re4 = new RegExp("^" + C + v + "[^aeiouwxy]$");
if (re2.test(w))
w = w + "e";
else if (re3.test(w)) {
re = /.$/;
w = w.replace(re,"");
}
else if (re4.test(w))
w = w + "e";
}
}
// Step 1c
re = /^(.+?)y$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
re = new RegExp(s_v);
if (re.test(stem))
w = stem + "i";
}
// Step 2
re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
suffix = fp[2];
re = new RegExp(mgr0);
if (re.test(stem))
w = stem + step2list[suffix];
}
// Step 3
re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
suffix = fp[2];
re = new RegExp(mgr0);
if (re.test(stem))
w = stem + step3list[suffix];
}
// Step 4
re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;
re2 = /^(.+?)(s|t)(ion)$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
re = new RegExp(mgr1);
if (re.test(stem))
w = stem;
}
else if (re2.test(w)) {
var fp = re2.exec(w);
stem = fp[1] + fp[2];
re2 = new RegExp(mgr1);
if (re2.test(stem))
w = stem;
}
// Step 5
re = /^(.+?)e$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
re = new RegExp(mgr1);
re2 = new RegExp(meq1);
re3 = new RegExp("^" + C + v + "[^aeiouwxy]$");
if (re.test(stem) || (re2.test(stem) && !(re3.test(stem))))
w = stem;
}
re = /ll$/;
re2 = new RegExp(mgr1);
if (re.test(w) && re2.test(w)) {
re = /.$/;
w = w.replace(re,"");
}
// and turn initial Y back to y
if (firstch == "y")
w = firstch.toLowerCase() + w.substr(1);
return w;
}
}
/**
* Search Module
*/
var Search = {
_index : null,
_queued_query : null,
_pulse_status : -1,
init : function() {
var params = $.getQueryParameters();
if (params.q) {
var query = params.q[0];
$('input[name="q"]')[0].value = query;
this.performSearch(query);
}
},
loadIndex : function(url) {
$.ajax({type: "GET", url: url, data: null, success: null,
dataType: "script", cache: true});
},
setIndex : function(index) {
var q;
this._index = index;
if ((q = this._queued_query) !== null) {
this._queued_query = null;
Search.query(q);
}
},
hasIndex : function() {
return this._index !== null;
},
deferQuery : function(query) {
this._queued_query = query;
},
stopPulse : function() {
this._pulse_status = 0;
},
startPulse : function() {
if (this._pulse_status >= 0)
return;
function pulse() {
Search._pulse_status = (Search._pulse_status + 1) % 4;
var dotString = '';
for (var i = 0; i < Search._pulse_status; i++)
dotString += '.';
Search.dots.text(dotString);
if (Search._pulse_status > -1)
window.setTimeout(pulse, 500);
};
pulse();
},
/**
* perform a search for something
*/
performSearch : function(query) {
// create the required interface elements
this.out = $('#search-results');
this.title = $('<h2>' + _('Searching') + '</h2>').appendTo(this.out);
this.dots = $('<span></span>').appendTo(this.title);
this.status = $('<p style="display: none"></p>').appendTo(this.out);
this.output = $('<ul class="search"/>').appendTo(this.out);
$('#search-progress').text(_('Preparing search...'));
this.startPulse();
// index already loaded, the browser was quick!
if (this.hasIndex())
this.query(query);
else
this.deferQuery(query);
},
query : function(query) {
var stopwords = ["and","then","into","it","as","are","in","if","for","no","there","their","was","is","be","to","that","but","they","not","such","with","by","a","on","these","of","will","this","near","the","or","at"];
// Stem the searchterms and add them to the correct list
var stemmer = new Stemmer();
var searchterms = [];
var excluded = [];
var hlterms = [];
var tmp = query.split(/\s+/);
var objectterms = [];
for (var i = 0; i < tmp.length; i++) {
if (tmp[i] != "") {
objectterms.push(tmp[i].toLowerCase());
}
if ($u.indexOf(stopwords, tmp[i]) != -1 || tmp[i].match(/^\d+$/) ||
tmp[i] == "") {
// skip this "word"
continue;
}
// stem the word
var word = stemmer.stemWord(tmp[i]).toLowerCase();
// select the correct list
if (word[0] == '-') {
var toAppend = excluded;
word = word.substr(1);
}
else {
var toAppend = searchterms;
hlterms.push(tmp[i].toLowerCase());
}
// only add if not already in the list
if (!$.contains(toAppend, word))
toAppend.push(word);
};
var highlightstring = '?highlight=' + $.urlencode(hlterms.join(" "));
// console.debug('SEARCH: searching for:');
// console.info('required: ', searchterms);
// console.info('excluded: ', excluded);
// prepare search
var filenames = this._index.filenames;
var titles = this._index.titles;
var terms = this._index.terms;
var fileMap = {};
var files = null;
// different result priorities
var importantResults = [];
var objectResults = [];
var regularResults = [];
var unimportantResults = [];
$('#search-progress').empty();
// lookup as object
for (var i = 0; i < objectterms.length; i++) {
var others = [].concat(objectterms.slice(0,i),
objectterms.slice(i+1, objectterms.length))
var results = this.performObjectSearch(objectterms[i], others);
// Assume first word is most likely to be the object,
// other words more likely to be in description.
// Therefore put matches for earlier words first.
// (Results are eventually used in reverse order).
objectResults = results[0].concat(objectResults);
importantResults = results[1].concat(importantResults);
unimportantResults = results[2].concat(unimportantResults);
}
// perform the search on the required terms
for (var i = 0; i < searchterms.length; i++) {
var word = searchterms[i];
// no match but word was a required one
if ((files = terms[word]) == null)
break;
if (files.length == undefined) {
files = [files];
}
// create the mapping
for (var j = 0; j < files.length; j++) {
var file = files[j];
if (file in fileMap)
fileMap[file].push(word);
else
fileMap[file] = [word];
}
}
// now check if the files don't contain excluded terms
for (var file in fileMap) {
var valid = true;
// check if all requirements are matched
if (fileMap[file].length != searchterms.length)
continue;
// ensure that none of the excluded terms is in the
// search result.
for (var i = 0; i < excluded.length; i++) {
if (terms[excluded[i]] == file ||
$.contains(terms[excluded[i]] || [], file)) {
valid = false;
break;
}
}
// if we have still a valid result we can add it
// to the result list
if (valid)
regularResults.push([filenames[file], titles[file], '', null]);
}
// delete unused variables in order to not waste
// memory until list is retrieved completely
delete filenames, titles, terms;
// now sort the regular results descending by title
regularResults.sort(function(a, b) {
var left = a[1].toLowerCase();
var right = b[1].toLowerCase();
return (left > right) ? -1 : ((left < right) ? 1 : 0);
});
// combine all results
var results = unimportantResults.concat(regularResults)
.concat(objectResults).concat(importantResults);
// print the results
var resultCount = results.length;
function displayNextItem() {
// results left, load the summary and display it
if (results.length) {
var item = results.pop();
var listItem = $('<li style="display:none"></li>');
if (DOCUMENTATION_OPTIONS.FILE_SUFFIX == '') {
// dirhtml builder
var dirname = item[0] + '/';
if (dirname.match(/\/index\/$/)) {
dirname = dirname.substring(0, dirname.length-6);
} else if (dirname == 'index/') {
dirname = '';
}
listItem.append($('<a/>').attr('href',
DOCUMENTATION_OPTIONS.URL_ROOT + dirname +
highlightstring + item[2]).html(item[1]));
} else {
// normal html builders
listItem.append($('<a/>').attr('href',
item[0] + DOCUMENTATION_OPTIONS.FILE_SUFFIX +
highlightstring + item[2]).html(item[1]));
}
if (item[3]) {
listItem.append($('<span> (' + item[3] + ')</span>'));
Search.output.append(listItem);
listItem.slideDown(5, function() {
displayNextItem();
});
} else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) {
$.get(DOCUMENTATION_OPTIONS.URL_ROOT + '_sources/' +
item[0] + '.txt', function(data) {
if (data != '') {
listItem.append($.makeSearchSummary(data, searchterms, hlterms));
Search.output.append(listItem);
}
listItem.slideDown(5, function() {
displayNextItem();
});
}, "text");
} else {
// no source available, just display title
Search.output.append(listItem);
listItem.slideDown(5, function() {
displayNextItem();
});
}
}
// search finished, update title and status message
else {
Search.stopPulse();
Search.title.text(_('Search Results'));
if (!resultCount)
Search.status.text(_('Your search did not match any documents. Please make sure that all words are spelled correctly and that you\'ve selected enough categories.'));
else
Search.status.text(_('Search finished, found %s page(s) matching the search query.').replace('%s', resultCount));
Search.status.fadeIn(500);
}
}
displayNextItem();
},
performObjectSearch : function(object, otherterms) {
var filenames = this._index.filenames;
var objects = this._index.objects;
var objnames = this._index.objnames;
var titles = this._index.titles;
var importantResults = [];
var objectResults = [];
var unimportantResults = [];
for (var prefix in objects) {
for (var name in objects[prefix]) {
var fullname = (prefix ? prefix + '.' : '') + name;
if (fullname.toLowerCase().indexOf(object) > -1) {
var match = objects[prefix][name];
var objname = objnames[match[1]][2];
var title = titles[match[0]];
// If more than one term searched for, we require other words to be
// found in the name/title/description
if (otherterms.length > 0) {
var haystack = (prefix + ' ' + name + ' ' +
objname + ' ' + title).toLowerCase();
var allfound = true;
for (var i = 0; i < otherterms.length; i++) {
if (haystack.indexOf(otherterms[i]) == -1) {
allfound = false;
break;
}
}
if (!allfound) {
continue;
}
}
var descr = objname + _(', in ') + title;
anchor = match[3];
if (anchor == '')
anchor = fullname;
else if (anchor == '-')
anchor = objnames[match[1]][1] + '-' + fullname;
result = [filenames[match[0]], fullname, '#'+anchor, descr];
switch (match[2]) {
case 1: objectResults.push(result); break;
case 0: importantResults.push(result); break;
case 2: unimportantResults.push(result); break;
}
}
}
}
// sort results descending
objectResults.sort(function(a, b) {
return (a[1] > b[1]) ? -1 : ((a[1] < b[1]) ? 1 : 0);
});
importantResults.sort(function(a, b) {
return (a[1] > b[1]) ? -1 : ((a[1] < b[1]) ? 1 : 0);
});
unimportantResults.sort(function(a, b) {
return (a[1] > b[1]) ? -1 : ((a[1] < b[1]) ? 1 : 0);
});
return [importantResults, objectResults, unimportantResults]
}
}
$(document).ready(function() {
Search.init();
});

148
third_party/python/mock-1.0.0/html/_static/sidebar.js поставляемый
Просмотреть файл

@ -1,148 +0,0 @@
/*
* sidebar.js
* ~~~~~~~~~~
*
* This script makes the Sphinx sidebar collapsible.
*
* .sphinxsidebar contains .sphinxsidebarwrapper. This script adds
* in .sphixsidebar, after .sphinxsidebarwrapper, the #sidebarbutton
* used to collapse and expand the sidebar.
*
* When the sidebar is collapsed the .sphinxsidebarwrapper is hidden
* and the width of the sidebar and the margin-left of the document
* are decreased. When the sidebar is expanded the opposite happens.
* This script saves a per-browser/per-session cookie used to
* remember the position of the sidebar among the pages.
* Once the browser is closed the cookie is deleted and the position
* reset to the default (expanded).
*
* :copyright: Copyright 2007-2010 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
$(function() {
// global elements used by the functions.
// the 'sidebarbutton' element is defined as global after its
// creation, in the add_sidebar_button function
var bodywrapper = $('.bodywrapper');
var sidebar = $('.sphinxsidebar');
var sidebarwrapper = $('.sphinxsidebarwrapper');
// original margin-left of the bodywrapper and width of the sidebar
// with the sidebar expanded
var bw_margin_expanded = bodywrapper.css('margin-left');
var ssb_width_expanded = sidebar.width();
// margin-left of the bodywrapper and width of the sidebar
// with the sidebar collapsed
var bw_margin_collapsed = '.8em';
var ssb_width_collapsed = '.8em';
// colors used by the current theme
var dark_color = $('.related').css('background-color');
var light_color = $('.document').css('background-color');
function sidebar_is_collapsed() {
return sidebarwrapper.is(':not(:visible)');
}
function toggle_sidebar() {
if (sidebar_is_collapsed())
expand_sidebar();
else
collapse_sidebar();
}
function collapse_sidebar() {
sidebarwrapper.hide();
sidebar.css('width', ssb_width_collapsed);
bodywrapper.css('margin-left', bw_margin_collapsed);
sidebarbutton.css({
'margin-left': '0',
'height': bodywrapper.height()
});
sidebarbutton.find('span').text('»');
sidebarbutton.attr('title', _('Expand sidebar'));
document.cookie = 'sidebar=collapsed';
}
function expand_sidebar() {
bodywrapper.css('margin-left', bw_margin_expanded);
sidebar.css('width', ssb_width_expanded);
sidebarwrapper.show();
sidebarbutton.css({
'margin-left': ssb_width_expanded-12,
'height': bodywrapper.height()
});
sidebarbutton.find('span').text('«');
sidebarbutton.attr('title', _('Collapse sidebar'));
document.cookie = 'sidebar=expanded';
}
function add_sidebar_button() {
sidebarwrapper.css({
'float': 'left',
'margin-right': '0',
'width': ssb_width_expanded - 28
});
// create the button
sidebar.append(
'<div id="sidebarbutton"><span>&laquo;</span></div>'
);
var sidebarbutton = $('#sidebarbutton');
light_color = sidebarbutton.css('background-color');
// find the height of the viewport to center the '<<' in the page
var viewport_height;
if (window.innerHeight)
viewport_height = window.innerHeight;
else
viewport_height = $(window).height();
sidebarbutton.find('span').css({
'display': 'block',
'margin-top': (viewport_height - sidebar.position().top - 20) / 2
});
sidebarbutton.click(toggle_sidebar);
sidebarbutton.attr('title', _('Collapse sidebar'));
sidebarbutton.css({
'color': '#FFFFFF',
'border-left': '1px solid ' + dark_color,
'font-size': '1.2em',
'cursor': 'pointer',
'height': bodywrapper.height(),
'padding-top': '1px',
'margin-left': ssb_width_expanded - 12
});
sidebarbutton.hover(
function () {
$(this).css('background-color', dark_color);
},
function () {
$(this).css('background-color', light_color);
}
);
}
function set_position_from_cookie() {
if (!document.cookie)
return;
var items = document.cookie.split(';');
for(var k=0; k<items.length; k++) {
var key_val = items[k].split('=');
var key = key_val[0];
if (key == 'sidebar') {
var value = key_val[1];
if ((value == 'collapsed') && (!sidebar_is_collapsed()))
collapse_sidebar();
else if ((value == 'expanded') && (sidebar_is_collapsed()))
expand_sidebar();
}
}
}
add_sidebar_button();
var sidebarbutton = $('#sidebarbutton');
set_position_from_cookie();
});

Двоичные данные
third_party/python/mock-1.0.0/html/_static/title_background.png поставляемый
Просмотреть файл

Двоичный файл не отображается.
Режим "рядом"

До

Ширина:  |  Высота:  |  Размер: 132 B

20
third_party/python/mock-1.0.0/html/_static/toc.js поставляемый
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@ -1,20 +0,0 @@
var TOC = {
load: function () {
$('#toc_button').click(TOC.toggle);
},
toggle: function () {
if ($('#sphinxsidebar').toggle().is(':hidden')) {
$('div.document').css('left', "0px");
$('toc_button').removeClass("open");
} else {
$('div.document').css('left', "230px");
$('#toc_button').addClass("open");
}
return $('#sphinxsidebar');
}
};
$(document).ready(function () {
TOC.load();
});

Двоичные данные
third_party/python/mock-1.0.0/html/_static/triangle_closed.png поставляемый
Просмотреть файл

Двоичный файл не отображается.
Режим "рядом"

До

Ширина:  |  Высота:  |  Размер: 181 B

Двоичные данные
third_party/python/mock-1.0.0/html/_static/triangle_left.png поставляемый
Просмотреть файл

Двоичный файл не отображается.
Режим "рядом"

До

Ширина:  |  Высота:  |  Размер: 195 B

Двоичные данные
third_party/python/mock-1.0.0/html/_static/triangle_open.png поставляемый
Просмотреть файл

Двоичный файл не отображается.
Режим "рядом"

До

Ширина:  |  Высота:  |  Размер: 191 B

23
third_party/python/mock-1.0.0/html/_static/underscore.js поставляемый
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@ -1,23 +0,0 @@
// Underscore.js 0.5.5
// (c) 2009 Jeremy Ashkenas, DocumentCloud Inc.
// Underscore is freely distributable under the terms of the MIT license.
// Portions of Underscore are inspired by or borrowed from Prototype.js,
// Oliver Steele's Functional, and John Resig's Micro-Templating.
// For all details and documentation:
// http://documentcloud.github.com/underscore/
(function(){var j=this,n=j._,i=function(a){this._wrapped=a},m=typeof StopIteration!=="undefined"?StopIteration:"__break__",b=j._=function(a){return new i(a)};if(typeof exports!=="undefined")exports._=b;var k=Array.prototype.slice,o=Array.prototype.unshift,p=Object.prototype.toString,q=Object.prototype.hasOwnProperty,r=Object.prototype.propertyIsEnumerable;b.VERSION="0.5.5";b.each=function(a,c,d){try{if(a.forEach)a.forEach(c,d);else if(b.isArray(a)||b.isArguments(a))for(var e=0,f=a.length;e<f;e++)c.call(d,
a[e],e,a);else{var g=b.keys(a);f=g.length;for(e=0;e<f;e++)c.call(d,a[g[e]],g[e],a)}}catch(h){if(h!=m)throw h;}return a};b.map=function(a,c,d){if(a&&b.isFunction(a.map))return a.map(c,d);var e=[];b.each(a,function(f,g,h){e.push(c.call(d,f,g,h))});return e};b.reduce=function(a,c,d,e){if(a&&b.isFunction(a.reduce))return a.reduce(b.bind(d,e),c);b.each(a,function(f,g,h){c=d.call(e,c,f,g,h)});return c};b.reduceRight=function(a,c,d,e){if(a&&b.isFunction(a.reduceRight))return a.reduceRight(b.bind(d,e),c);
var f=b.clone(b.toArray(a)).reverse();b.each(f,function(g,h){c=d.call(e,c,g,h,a)});return c};b.detect=function(a,c,d){var e;b.each(a,function(f,g,h){if(c.call(d,f,g,h)){e=f;b.breakLoop()}});return e};b.select=function(a,c,d){if(a&&b.isFunction(a.filter))return a.filter(c,d);var e=[];b.each(a,function(f,g,h){c.call(d,f,g,h)&&e.push(f)});return e};b.reject=function(a,c,d){var e=[];b.each(a,function(f,g,h){!c.call(d,f,g,h)&&e.push(f)});return e};b.all=function(a,c,d){c=c||b.identity;if(a&&b.isFunction(a.every))return a.every(c,
d);var e=true;b.each(a,function(f,g,h){(e=e&&c.call(d,f,g,h))||b.breakLoop()});return e};b.any=function(a,c,d){c=c||b.identity;if(a&&b.isFunction(a.some))return a.some(c,d);var e=false;b.each(a,function(f,g,h){if(e=c.call(d,f,g,h))b.breakLoop()});return e};b.include=function(a,c){if(b.isArray(a))return b.indexOf(a,c)!=-1;var d=false;b.each(a,function(e){if(d=e===c)b.breakLoop()});return d};b.invoke=function(a,c){var d=b.rest(arguments,2);return b.map(a,function(e){return(c?e[c]:e).apply(e,d)})};b.pluck=
function(a,c){return b.map(a,function(d){return d[c]})};b.max=function(a,c,d){if(!c&&b.isArray(a))return Math.max.apply(Math,a);var e={computed:-Infinity};b.each(a,function(f,g,h){g=c?c.call(d,f,g,h):f;g>=e.computed&&(e={value:f,computed:g})});return e.value};b.min=function(a,c,d){if(!c&&b.isArray(a))return Math.min.apply(Math,a);var e={computed:Infinity};b.each(a,function(f,g,h){g=c?c.call(d,f,g,h):f;g<e.computed&&(e={value:f,computed:g})});return e.value};b.sortBy=function(a,c,d){return b.pluck(b.map(a,
function(e,f,g){return{value:e,criteria:c.call(d,e,f,g)}}).sort(function(e,f){e=e.criteria;f=f.criteria;return e<f?-1:e>f?1:0}),"value")};b.sortedIndex=function(a,c,d){d=d||b.identity;for(var e=0,f=a.length;e<f;){var g=e+f>>1;d(a[g])<d(c)?(e=g+1):(f=g)}return e};b.toArray=function(a){if(!a)return[];if(a.toArray)return a.toArray();if(b.isArray(a))return a;if(b.isArguments(a))return k.call(a);return b.values(a)};b.size=function(a){return b.toArray(a).length};b.first=function(a,c,d){return c&&!d?k.call(a,
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a.length;d--;)if(a[d]===c)return d;return-1};b.range=function(a,c,d){var e=b.toArray(arguments),f=e.length<=1;a=f?0:e[0];c=f?e[0]:e[1];d=e[2]||1;e=Math.ceil((c-a)/d);if(e<=0)return[];e=new Array(e);f=a;for(var g=0;1;f+=d){if((d>0?f-c:c-f)>=0)return e;e[g++]=f}};b.bind=function(a,c){var d=b.rest(arguments,2);return function(){return a.apply(c||j,d.concat(b.toArray(arguments)))}};b.bindAll=function(a){var c=b.rest(arguments);if(c.length==0)c=b.functions(a);b.each(c,function(d){a[d]=b.bind(a[d],a)});
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<div class="section" id="changelog">
<h1>CHANGELOG<a class="headerlink" href="#changelog" title="Permalink to this headline"></a></h1>
<div class="section" id="version-1-0-0">
<h2>2012/10/07 Version 1.0.0<a class="headerlink" href="#version-1-0-0" title="Permalink to this headline"></a></h2>
<p>No changes since 1.0.0 beta 1. This version has feature parity with
<a class="reference external" href="http://docs.python.org/py3k/library/unittest.mock.html#module-unittest.mock">unittest.mock</a>
in Python 3.3.</p>
<p>Full list of changes since 0.8:</p>
<ul class="simple">
<li><cite>mocksignature</cite>, along with the <cite>mocksignature</cite> argument to <cite>patch</cite>, removed</li>
<li>Support for deleting attributes (accessing deleted attributes will raise an
<cite>AttributeError</cite>)</li>
<li>Added the <cite>mock_open</cite> helper function for mocking the builtin <cite>open</cite></li>
<li><cite>__class__</cite> is assignable, so a mock can pass an <cite>isinstance</cite> check without
requiring a spec</li>
<li>Addition of <cite>PropertyMock</cite>, for mocking properties</li>
<li><cite>MagicMocks</cite> made unorderable by default (in Python 3). The comparison
methods (other than equality and inequality) now return <cite>NotImplemented</cite></li>
<li>Propagate traceback info to support subclassing of <cite>_patch</cite> by other
libraries</li>
<li><cite>create_autospec</cite> works with attributes present in results of <cite>dir</cite> that
can&#8217;t be fetched from the object&#8217;s class. Contributed by Konstantine Rybnikov</li>
<li>Any exceptions in an iterable <cite>side_effect</cite> will be raised instead of
returned</li>
<li>In Python 3, <cite>create_autospec</cite> now supports keyword only arguments</li>
<li>Added <cite>patch.stopall</cite> method to stop all active patches created by <cite>start</cite></li>
<li>BUGFIX: calling <cite>MagicMock.reset_mock</cite> wouldn&#8217;t reset magic method mocks</li>
<li>BUGFIX: calling <cite>reset_mock</cite> on a <cite>MagicMock</cite> created with autospec could
raise an exception</li>
<li>BUGFIX: passing multiple spec arguments to patchers (<cite>spec</cite> , <cite>spec_set</cite> and
<cite>autospec</cite>) had unpredictable results, now it is an error</li>
<li>BUGFIX: using <cite>spec=True</cite> <em>and</em> <cite>create=True</cite> as arguments to patchers could
result in using <cite>DEFAULT</cite> as the spec. Now it is an error instead</li>
<li>BUGFIX: using <cite>spec</cite> or <cite>autospec</cite> arguments to patchers, along with
<cite>spec_set=True</cite> did not work correctly</li>
<li>BUGFIX: using an object that evaluates to False as a spec could be ignored</li>
<li>BUGFIX: a list as the <cite>spec</cite> argument to a patcher would always result in a
non-callable mock. Now if <cite>__call__</cite> is in the spec the mock is callable</li>
</ul>
</div>
<div class="section" id="version-1-0-0-beta-1">
<h2>2012/07/13 Version 1.0.0 beta 1<a class="headerlink" href="#version-1-0-0-beta-1" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>Added <cite>patch.stopall</cite> method to stop all active patches created by <cite>start</cite></li>
<li>BUGFIX: calling <cite>MagicMock.reset_mock</cite> wouldn&#8217;t reset magic method mocks</li>
<li>BUGFIX: calling <cite>reset_mock</cite> on a <cite>MagicMock</cite> created with autospec could
raise an exception</li>
</ul>
</div>
<div class="section" id="version-1-0-0-alpha-2">
<h2>2012/05/04 Version 1.0.0 alpha 2<a class="headerlink" href="#version-1-0-0-alpha-2" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li><cite>PropertyMock</cite> attributes are now standard <cite>MagicMocks</cite></li>
<li><cite>create_autospec</cite> works with attributes present in results of <cite>dir</cite> that
can&#8217;t be fetched from the object&#8217;s class. Contributed by Konstantine Rybnikov</li>
<li>Any exceptions in an iterable <cite>side_effect</cite> will be raised instead of
returned</li>
<li>In Python 3, <cite>create_autospec</cite> now supports keyword only arguments</li>
</ul>
</div>
<div class="section" id="version-1-0-0-alpha-1">
<h2>2012/03/25 Version 1.0.0 alpha 1<a class="headerlink" href="#version-1-0-0-alpha-1" title="Permalink to this headline"></a></h2>
<p>The standard library version!</p>
<ul class="simple">
<li><cite>mocksignature</cite>, along with the <cite>mocksignature</cite> argument to <cite>patch</cite>, removed</li>
<li>Support for deleting attributes (accessing deleted attributes will raise an
<cite>AttributeError</cite>)</li>
<li>Added the <cite>mock_open</cite> helper function for mocking the builtin <cite>open</cite></li>
<li><cite>__class__</cite> is assignable, so a mock can pass an <cite>isinstance</cite> check without
requiring a spec</li>
<li>Addition of <cite>PropertyMock</cite>, for mocking properties</li>
<li><cite>MagicMocks</cite> made unorderable by default (in Python 3). The comparison
methods (other than equality and inequality) now return <cite>NotImplemented</cite></li>
<li>Propagate traceback info to support subclassing of <cite>_patch</cite> by other
libraries</li>
<li>BUGFIX: passing multiple spec arguments to patchers (<cite>spec</cite> , <cite>spec_set</cite> and
<cite>autospec</cite>) had unpredictable results, now it is an error</li>
<li>BUGFIX: using <cite>spec=True</cite> <em>and</em> <cite>create=True</cite> as arguments to patchers could
result in using <cite>DEFAULT</cite> as the spec. Now it is an error instead</li>
<li>BUGFIX: using <cite>spec</cite> or <cite>autospec</cite> arguments to patchers, along with
<cite>spec_set=True</cite> did not work correctly</li>
<li>BUGFIX: using an object that evaluates to False as a spec could be ignored</li>
<li>BUGFIX: a list as the <cite>spec</cite> argument to a patcher would always result in a
non-callable mock. Now if <cite>__call__</cite> is in the spec the mock is callable</li>
</ul>
</div>
<div class="section" id="version-0-8-0">
<h2>2012/02/13 Version 0.8.0<a class="headerlink" href="#version-0-8-0" title="Permalink to this headline"></a></h2>
<p>The only changes since 0.8rc2 are:</p>
<ul class="simple">
<li>Improved repr of <a class="reference internal" href="sentinel.html#mock.sentinel" title="mock.sentinel"><tt class="xref py py-data docutils literal"><span class="pre">sentinel</span></tt></a> objects</li>
<li><a class="reference internal" href="helpers.html#mock.ANY" title="mock.ANY"><tt class="xref py py-data docutils literal"><span class="pre">ANY</span></tt></a> can be used for comparisons against <a class="reference internal" href="helpers.html#mock.call" title="mock.call"><tt class="xref py py-data docutils literal"><span class="pre">call</span></tt></a> objects</li>
<li>The return value of <cite>MagicMock.__iter__</cite> method can be set to
any iterable and isn&#8217;t required to be an iterator</li>
</ul>
<p>Full List of changes since 0.7:</p>
<p>mock 0.8.0 is the last version that will support Python 2.4.</p>
<ul class="simple">
<li>Addition of <a class="reference internal" href="mock.html#mock.Mock.mock_calls" title="mock.Mock.mock_calls"><tt class="xref py py-attr docutils literal"><span class="pre">mock_calls</span></tt></a> list for <em>all</em> calls (including magic
methods and chained calls)</li>
<li><a class="reference internal" href="patch.html#mock.patch" title="mock.patch"><tt class="xref py py-func docutils literal"><span class="pre">patch()</span></tt></a> and <a class="reference internal" href="patch.html#mock.patch.object" title="mock.patch.object"><tt class="xref py py-func docutils literal"><span class="pre">patch.object()</span></tt></a> now create a <a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a>
instead of a <a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt></a> by default</li>
<li>The patchers (<cite>patch</cite>, <cite>patch.object</cite> and <cite>patch.dict</cite>), plus <cite>Mock</cite> and
<cite>MagicMock</cite>, take arbitrary keyword arguments for configuration</li>
<li>New mock method <a class="reference internal" href="mock.html#mock.Mock.configure_mock" title="mock.Mock.configure_mock"><tt class="xref py py-meth docutils literal"><span class="pre">configure_mock()</span></tt></a> for setting attributes and
return values / side effects on the mock and its attributes</li>
<li>New mock assert methods <a class="reference internal" href="mock.html#mock.Mock.assert_any_call" title="mock.Mock.assert_any_call"><tt class="xref py py-meth docutils literal"><span class="pre">assert_any_call()</span></tt></a> and
<a class="reference internal" href="mock.html#mock.Mock.assert_has_calls" title="mock.Mock.assert_has_calls"><tt class="xref py py-meth docutils literal"><span class="pre">assert_has_calls()</span></tt></a></li>
<li>Implemented <a class="reference internal" href="helpers.html#auto-speccing"><em>Autospeccing</em></a> (recursive, lazy speccing of mocks with
mocked signatures for functions/methods), as the <cite>autospec</cite> argument to
<cite>patch</cite></li>
<li>Added the <a class="reference internal" href="helpers.html#mock.create_autospec" title="mock.create_autospec"><tt class="xref py py-func docutils literal"><span class="pre">create_autospec()</span></tt></a> function for manually creating
&#8216;auto-specced&#8217; mocks</li>
<li><a class="reference internal" href="patch.html#mock.patch.multiple" title="mock.patch.multiple"><tt class="xref py py-func docutils literal"><span class="pre">patch.multiple()</span></tt></a> for doing multiple patches in a single call, using
keyword arguments</li>
<li>Setting <a class="reference internal" href="mock.html#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a> to an iterable will cause calls to the mock
to return the next value from the iterable</li>
<li>New <cite>new_callable</cite> argument to <cite>patch</cite> and <cite>patch.object</cite> allowing you to
pass in a class or callable object (instead of <cite>MagicMock</cite>) that will be
called to replace the object being patched</li>
<li>Addition of <a class="reference internal" href="mock.html#mock.NonCallableMock" title="mock.NonCallableMock"><tt class="xref py py-class docutils literal"><span class="pre">NonCallableMock</span></tt></a> and <a class="reference internal" href="magicmock.html#mock.NonCallableMagicMock" title="mock.NonCallableMagicMock"><tt class="xref py py-class docutils literal"><span class="pre">NonCallableMagicMock</span></tt></a>, mocks
without a <cite>__call__</cite> method</li>
<li>Addition of <a class="reference internal" href="mock.html#mock.Mock.mock_add_spec" title="mock.Mock.mock_add_spec"><tt class="xref py py-meth docutils literal"><span class="pre">mock_add_spec()</span></tt></a> method for adding (or changing) a
spec on an existing mock</li>
<li>Protocol methods on <a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a> are magic mocks, and are created
lazily on first lookup. This means the result of calling a protocol method is
a <cite>MagicMock</cite> instead of a <cite>Mock</cite> as it was previously</li>
<li>Addition of <a class="reference internal" href="mock.html#mock.Mock.attach_mock" title="mock.Mock.attach_mock"><tt class="xref py py-meth docutils literal"><span class="pre">attach_mock()</span></tt></a> method</li>
<li>Added <a class="reference internal" href="helpers.html#mock.ANY" title="mock.ANY"><tt class="xref py py-data docutils literal"><span class="pre">ANY</span></tt></a> for ignoring arguments in <a class="reference internal" href="mock.html#mock.Mock.assert_called_with" title="mock.Mock.assert_called_with"><tt class="xref py py-meth docutils literal"><span class="pre">assert_called_with()</span></tt></a>
calls</li>
<li>Addition of <a class="reference internal" href="helpers.html#mock.call" title="mock.call"><tt class="xref py py-data docutils literal"><span class="pre">call</span></tt></a> helper object</li>
<li>Improved repr for mocks</li>
<li>Improved repr for <a class="reference internal" href="mock.html#mock.Mock.call_args" title="mock.Mock.call_args"><tt class="xref py py-attr docutils literal"><span class="pre">Mock.call_args</span></tt></a> and entries in
<a class="reference internal" href="mock.html#mock.Mock.call_args_list" title="mock.Mock.call_args_list"><tt class="xref py py-attr docutils literal"><span class="pre">Mock.call_args_list</span></tt></a>, <a class="reference internal" href="mock.html#mock.Mock.method_calls" title="mock.Mock.method_calls"><tt class="xref py py-attr docutils literal"><span class="pre">Mock.method_calls</span></tt></a> and
<a class="reference internal" href="mock.html#mock.Mock.mock_calls" title="mock.Mock.mock_calls"><tt class="xref py py-attr docutils literal"><span class="pre">Mock.mock_calls</span></tt></a></li>
<li>Improved repr for <a class="reference internal" href="sentinel.html#mock.sentinel" title="mock.sentinel"><tt class="xref py py-data docutils literal"><span class="pre">sentinel</span></tt></a> objects</li>
<li><cite>patch</cite> lookup is done at use time not at decoration time</li>
<li>In Python 2.6 or more recent, <cite>dir</cite> on a mock will report all the dynamically
created attributes (or the full list of attributes if there is a spec) as
well as all the mock methods and attributes.</li>
<li>Module level <a class="reference internal" href="helpers.html#mock.FILTER_DIR" title="mock.FILTER_DIR"><tt class="xref py py-data docutils literal"><span class="pre">FILTER_DIR</span></tt></a> added to control whether <cite>dir(mock)</cite> filters
private attributes. <cite>True</cite> by default.</li>
<li><cite>patch.TEST_PREFIX</cite> for controlling how patchers recognise test methods when
used to decorate a class</li>
<li>Support for using Java exceptions as a <a class="reference internal" href="mock.html#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a> on Jython</li>
<li><cite>Mock</cite> call lists (<cite>call_args_list</cite>, <cite>method_calls</cite> &amp; <cite>mock_calls</cite>) are now
custom list objects that allow membership tests for &#8220;sub lists&#8221; and have
a nicer representation if you <cite>str</cite> or <cite>print</cite> them</li>
<li>Mocks attached as attributes or return values to other mocks have calls
recorded in <cite>method_calls</cite> and <cite>mock_calls</cite> of the parent (unless a name is
already set on the child)</li>
<li>Improved failure messages for <cite>assert_called_with</cite> and
<cite>assert_called_once_with</cite></li>
<li>The return value of the <a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a> <cite>__iter__</cite> method can be set to
any iterable and isn&#8217;t required to be an iterator</li>
<li>Added the Mock API (<cite>assert_called_with</cite> etc) to functions created by
<tt class="xref py py-func docutils literal"><span class="pre">mocksignature()</span></tt></li>
<li>Tuples as well as lists can be used to specify allowed methods for <cite>spec</cite> &amp;
<cite>spec_set</cite> arguments</li>
<li>Calling <cite>stop</cite> on an unstarted patcher fails with a more meaningful error
message</li>
<li>Renamed the internal classes <cite>Sentinel</cite> and <cite>SentinelObject</cite> to prevent abuse</li>
<li>BUGFIX: an error creating a patch, with nested patch decorators, won&#8217;t leave
patches in place</li>
<li>BUGFIX: <cite>__truediv__</cite> and <cite>__rtruediv__</cite> not available as magic methods on
mocks in Python 3</li>
<li>BUGFIX: <cite>assert_called_with</cite> / <cite>assert_called_once_with</cite> can be used with
<cite>self</cite> as a keyword argument</li>
<li>BUGFIX: when patching a class with an explicit spec / spec_set (not a
boolean) it applies &#8220;spec inheritance&#8221; to the return value of the created
mock (the &#8220;instance&#8221;)</li>
<li>BUGFIX: remove the <cite>__unittest</cite> marker causing traceback truncation</li>
<li>Removal of deprecated <cite>patch_object</cite></li>
<li>Private attributes <cite>_name</cite>, <cite>_methods</cite>, &#8216;_children&#8217;, <cite>_wraps</cite> and <cite>_parent</cite>
(etc) renamed to reduce likelihood of clash with user attributes.</li>
<li>Added license file to the distribution</li>
</ul>
</div>
<div class="section" id="version-0-8-0-release-candidate-2">
<h2>2012/01/10 Version 0.8.0 release candidate 2<a class="headerlink" href="#version-0-8-0-release-candidate-2" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>Removed the <cite>configure</cite> keyword argument to <cite>create_autospec</cite> and allow
arbitrary keyword arguments (for the <cite>Mock</cite> constructor) instead</li>
<li>Fixed <cite>ANY</cite> equality with some types in <cite>assert_called_with</cite> calls</li>
<li>Switched to a standard Sphinx theme (compatible with
<a class="reference external" href="http://mock.readthedocs.org">readthedocs.org</a>)</li>
</ul>
</div>
<div class="section" id="version-0-8-0-release-candidate-1">
<h2>2011/12/29 Version 0.8.0 release candidate 1<a class="headerlink" href="#version-0-8-0-release-candidate-1" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li><cite>create_autospec</cite> on the return value of a mocked class will use <cite>__call__</cite>
for the signature rather than <cite>__init__</cite></li>
<li>Performance improvement instantiating <cite>Mock</cite> and <cite>MagicMock</cite></li>
<li>Mocks used as magic methods have the same type as their parent instead of
being hardcoded to <cite>MagicMock</cite></li>
</ul>
<p>Special thanks to Julian Berman for his help with diagnosing and improving
performance in this release.</p>
</div>
<div class="section" id="version-0-8-0-beta-4">
<h2>2011/10/09 Version 0.8.0 beta 4<a class="headerlink" href="#version-0-8-0-beta-4" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li><cite>patch</cite> lookup is done at use time not at decoration time</li>
<li>When attaching a Mock to another Mock as a magic method, calls are recorded
in mock_calls</li>
<li>Addition of <cite>attach_mock</cite> method</li>
<li>Renamed the internal classes <cite>Sentinel</cite> and <cite>SentinelObject</cite> to prevent abuse</li>
<li>BUGFIX: various issues around circular references with mocks (setting a mock
return value to be itself etc)</li>
</ul>
</div>
<div class="section" id="version-0-8-0-beta-3">
<h2>2011/08/15 Version 0.8.0 beta 3<a class="headerlink" href="#version-0-8-0-beta-3" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>Mocks attached as attributes or return values to other mocks have calls
recorded in <cite>method_calls</cite> and <cite>mock_calls</cite> of the parent (unless a name is
already set on the child)</li>
<li>Addition of <cite>mock_add_spec</cite> method for adding (or changing) a spec on an
existing mock</li>
<li>Improved repr for <cite>Mock.call_args</cite> and entries in <cite>Mock.call_args_list</cite>,
<cite>Mock.method_calls</cite> and <cite>Mock.mock_calls</cite></li>
<li>Improved repr for mocks</li>
<li>BUGFIX: minor fixes in the way <cite>mock_calls</cite> is worked out,
especially for &#8220;intermediate&#8221; mocks in a call chain</li>
</ul>
</div>
<div class="section" id="version-0-8-0-beta-2">
<h2>2011/08/05 Version 0.8.0 beta 2<a class="headerlink" href="#version-0-8-0-beta-2" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>Setting <cite>side_effect</cite> to an iterable will cause calls to the mock to return
the next value from the iterable</li>
<li>Added <cite>assert_any_call</cite> method</li>
<li>Moved <cite>assert_has_calls</cite> from call lists onto mocks</li>
<li>BUGFIX: <cite>call_args</cite> and all members of <cite>call_args_list</cite> are two tuples of
<cite>(args, kwargs)</cite> again instead of three tuples of <cite>(name, args, kwargs)</cite></li>
</ul>
</div>
<div class="section" id="version-0-8-0-beta-1">
<h2>2011/07/25 Version 0.8.0 beta 1<a class="headerlink" href="#version-0-8-0-beta-1" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li><cite>patch.TEST_PREFIX</cite> for controlling how patchers recognise test methods when
used to decorate a class</li>
<li><cite>Mock</cite> call lists (<cite>call_args_list</cite>, <cite>method_calls</cite> &amp; <cite>mock_calls</cite>) are now
custom list objects that allow membership tests for &#8220;sub lists&#8221; and have
an <cite>assert_has_calls</cite> method for unordered call checks</li>
<li><cite>callargs</cite> changed to <em>always</em> be a three-tuple of <cite>(name, args, kwargs)</cite></li>
<li>Addition of <cite>mock_calls</cite> list for <em>all</em> calls (including magic methods and
chained calls)</li>
<li>Extension of <cite>call</cite> object to support chained calls and <cite>callargs</cite> for better
comparisons with or without names. <cite>call</cite> object has a <cite>call_list</cite> method for
chained calls</li>
<li>Added the public <cite>instance</cite> argument to <cite>create_autospec</cite></li>
<li>Support for using Java exceptions as a <cite>side_effect</cite> on Jython</li>
<li>Improved failure messages for <cite>assert_called_with</cite> and
<cite>assert_called_once_with</cite></li>
<li>Tuples as well as lists can be used to specify allowed methods for <cite>spec</cite> &amp;
<cite>spec_set</cite> arguments</li>
<li>BUGFIX: Fixed bug in <cite>patch.multiple</cite> for argument passing when creating
mocks</li>
<li>Added license file to the distribution</li>
</ul>
</div>
<div class="section" id="version-0-8-0-alpha-2">
<h2>2011/07/16 Version 0.8.0 alpha 2<a class="headerlink" href="#version-0-8-0-alpha-2" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li><cite>patch.multiple</cite> for doing multiple patches in a single call, using keyword
arguments</li>
<li>New <cite>new_callable</cite> argument to <cite>patch</cite> and <cite>patch.object</cite> allowing you to
pass in a class or callable object (instead of <cite>MagicMock</cite>) that will be
called to replace the object being patched</li>
<li>Addition of <cite>NonCallableMock</cite> and <cite>NonCallableMagicMock</cite>, mocks without a
<cite>__call__</cite> method</li>
<li>Mocks created by <cite>patch</cite> have a <cite>MagicMock</cite> as the <cite>return_value</cite> where a
class is being patched</li>
<li><cite>create_autospec</cite> can create non-callable mocks for non-callable objects.
<cite>return_value</cite> mocks of classes will be non-callable unless the class has
a <cite>__call__</cite> method</li>
<li><cite>autospec</cite> creates a <cite>MagicMock</cite> without a spec for properties and slot
descriptors, because we don&#8217;t know the type of object they return</li>
<li>Removed the &#8220;inherit&#8221; argument from <cite>create_autospec</cite></li>
<li>Calling <cite>stop</cite> on an unstarted patcher fails with a more meaningful error
message</li>
<li>BUGFIX: an error creating a patch, with nested patch decorators, won&#8217;t leave
patches in place</li>
<li>BUGFIX: <cite>__truediv__</cite> and <cite>__rtruediv__</cite> not available as magic methods on
mocks in Python 3</li>
<li>BUGFIX: <cite>assert_called_with</cite> / <cite>assert_called_once_with</cite> can be used with
<cite>self</cite> as a keyword argument</li>
<li>BUGFIX: autospec for functions / methods with an argument named self that
isn&#8217;t the first argument no longer broken</li>
<li>BUGFIX: when patching a class with an explicit spec / spec_set (not a
boolean) it applies &#8220;spec inheritance&#8221; to the return value of the created
mock (the &#8220;instance&#8221;)</li>
<li>BUGFIX: remove the <cite>__unittest</cite> marker causing traceback truncation</li>
</ul>
</div>
<div class="section" id="version-0-8-0-alpha-1">
<h2>2011/06/14 Version 0.8.0 alpha 1<a class="headerlink" href="#version-0-8-0-alpha-1" title="Permalink to this headline"></a></h2>
<p>mock 0.8.0 is the last version that will support Python 2.4.</p>
<ul>
<li><p class="first">The patchers (<cite>patch</cite>, <cite>patch.object</cite> and <cite>patch.dict</cite>), plus <cite>Mock</cite> and
<cite>MagicMock</cite>, take arbitrary keyword arguments for configuration</p>
</li>
<li><p class="first">New mock method <cite>configure_mock</cite> for setting attributes and return values /
side effects on the mock and its attributes</p>
</li>
<li><p class="first">In Python 2.6 or more recent, <cite>dir</cite> on a mock will report all the dynamically
created attributes (or the full list of attributes if there is a spec) as
well as all the mock methods and attributes.</p>
</li>
<li><p class="first">Module level <cite>FILTER_DIR</cite> added to control whether <cite>dir(mock)</cite> filters
private attributes. <cite>True</cite> by default. Note that <cite>vars(Mock())</cite> can still be
used to get all instance attributes and <cite>dir(type(Mock())</cite> will still return
all the other attributes (irrespective of <cite>FILTER_DIR</cite>)</p>
</li>
<li><p class="first"><cite>patch</cite> and <cite>patch.object</cite> now create a <cite>MagicMock</cite> instead of a <cite>Mock</cite> by
default</p>
</li>
<li><p class="first">Added <cite>ANY</cite> for ignoring arguments in <cite>assert_called_with</cite> calls</p>
</li>
<li><p class="first">Addition of <cite>call</cite> helper object</p>
</li>
<li><p class="first">Protocol methods on <cite>MagicMock</cite> are magic mocks, and are created lazily on
first lookup. This means the result of calling a protocol method is a
MagicMock instead of a Mock as it was previously</p>
</li>
<li><p class="first">Added the Mock API (<cite>assert_called_with</cite> etc) to functions created by
<cite>mocksignature</cite></p>
</li>
<li><p class="first">Private attributes <cite>_name</cite>, <cite>_methods</cite>, &#8216;_children&#8217;, <cite>_wraps</cite> and <cite>_parent</cite>
(etc) renamed to reduce likelihood of clash with user attributes.</p>
</li>
<li><p class="first">Implemented auto-speccing (recursive, lazy speccing of mocks with mocked
signatures for functions/methods)</p>
<p>Limitations:</p>
<ul class="simple">
<li>Doesn&#8217;t mock magic methods or attributes (it creates MagicMocks, so the
magic methods are <em>there</em>, they just don&#8217;t have the signature mocked nor
are attributes followed)</li>
<li>Doesn&#8217;t mock function / method attributes</li>
<li>Uses object traversal on the objects being mocked to determine types - so
properties etc may be triggered</li>
<li>The return value of mocked classes (the &#8216;instance&#8217;) has the same call
signature as the class __init__ (as they share the same spec)</li>
</ul>
<p>You create auto-specced mocks by passing <cite>autospec=True</cite> to <cite>patch</cite>.</p>
<p>Note that attributes that are None are special cased and mocked without a
spec (so any attribute / method can be used). This is because None is
typically used as a default value for attributes that may be of some other
type, and as we don&#8217;t know what type that may be we allow all access.</p>
<p>Note that the <cite>autospec</cite> option to <cite>patch</cite> obsoletes the <cite>mocksignature</cite>
option.</p>
</li>
<li><p class="first">Added the <cite>create_autospec</cite> function for manually creating &#8216;auto-specced&#8217;
mocks</p>
</li>
<li><p class="first">Removal of deprecated <cite>patch_object</cite></p>
</li>
</ul>
</div>
<div class="section" id="version-0-7-2">
<h2>2011/05/30 Version 0.7.2<a class="headerlink" href="#version-0-7-2" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>BUGFIX: instances of list subclasses can now be used as mock specs</li>
<li>BUGFIX: MagicMock equality / inequality protocol methods changed to use the
default equality / inequality. This is done through a <cite>side_effect</cite> on
the mocks used for <cite>__eq__</cite> / <cite>__ne__</cite></li>
</ul>
</div>
<div class="section" id="version-0-7-1">
<h2>2011/05/06 Version 0.7.1<a class="headerlink" href="#version-0-7-1" title="Permalink to this headline"></a></h2>
<p>Package fixes contributed by Michael Fladischer. No code changes.</p>
<ul class="simple">
<li>Include template in package</li>
<li>Use isolated binaries for the tox tests</li>
<li>Unset executable bit on docs</li>
<li>Fix DOS line endings in getting-started.txt</li>
</ul>
</div>
<div class="section" id="version-0-7-0">
<h2>2011/03/05 Version 0.7.0<a class="headerlink" href="#version-0-7-0" title="Permalink to this headline"></a></h2>
<p>No API changes since 0.7.0 rc1. Many documentation changes including a stylish
new <a class="reference external" href="https://github.com/coordt/ADCtheme/">Sphinx theme</a>.</p>
<p>The full set of changes since 0.6.0 are:</p>
<ul class="simple">
<li>Python 3 compatibility</li>
<li>Ability to mock magic methods with <cite>Mock</cite> and addition of <cite>MagicMock</cite>
with pre-created magic methods</li>
<li>Addition of <cite>mocksignature</cite> and <cite>mocksignature</cite> argument to <cite>patch</cite> and
<cite>patch.object</cite></li>
<li>Addition of <cite>patch.dict</cite> for changing dictionaries during a test</li>
<li>Ability to use <cite>patch</cite>, <cite>patch.object</cite> and <cite>patch.dict</cite> as class decorators</li>
<li>Renamed <tt class="docutils literal"><span class="pre">patch_object</span></tt> to <cite>patch.object</cite> (<tt class="docutils literal"><span class="pre">patch_object</span></tt> is
deprecated)</li>
<li>Addition of soft comparisons: <cite>call_args</cite>, <cite>call_args_list</cite> and <cite>method_calls</cite>
now return tuple-like objects which compare equal even when empty args
or kwargs are skipped</li>
<li>patchers (<cite>patch</cite>, <cite>patch.object</cite> and <cite>patch.dict</cite>) have start and stop
methods</li>
<li>Addition of <cite>assert_called_once_with</cite> method</li>
<li>Mocks can now be named (<cite>name</cite> argument to constructor) and the name is used
in the repr</li>
<li>repr of a mock with a spec includes the class name of the spec</li>
<li><cite>assert_called_with</cite> works with <cite>python -OO</cite></li>
<li>New <cite>spec_set</cite> keyword argument to <cite>Mock</cite> and <cite>patch</cite>. If used,
attempting to <em>set</em> an attribute on a mock not on the spec will raise an
<cite>AttributeError</cite></li>
<li>Mocks created with a spec can now pass <cite>isinstance</cite> tests (<cite>__class__</cite>
returns the type of the spec)</li>
<li>Added docstrings to all objects</li>
<li>Improved failure message for <cite>Mock.assert_called_with</cite> when the mock
has not been called at all</li>
<li>Decorated functions / methods have their docstring and <cite>__module__</cite>
preserved on Python 2.4.</li>
<li>BUGFIX: <cite>mock.patch</cite> now works correctly with certain types of objects that
proxy attribute access, like the django settings object</li>
<li>BUGFIX: mocks are now copyable (thanks to Ned Batchelder for reporting and
diagnosing this)</li>
<li>BUGFIX: <cite>spec=True</cite> works with old style classes</li>
<li>BUGFIX: <tt class="docutils literal"><span class="pre">help(mock)</span></tt> works now (on the module). Can no longer use <tt class="docutils literal"><span class="pre">__bases__</span></tt>
as a valid sentinel name (thanks to Stephen Emslie for reporting and
diagnosing this)</li>
<li>BUGFIX: <tt class="docutils literal"><span class="pre">side_effect</span></tt> now works with <tt class="docutils literal"><span class="pre">BaseException</span></tt> exceptions like
<tt class="docutils literal"><span class="pre">KeyboardInterrupt</span></tt></li>
<li>BUGFIX: <cite>reset_mock</cite> caused infinite recursion when a mock is set as its own
return value</li>
<li>BUGFIX: patching the same object twice now restores the patches correctly</li>
<li>with statement tests now skipped on Python 2.4</li>
<li>Tests require unittest2 (or unittest2-py3k) to run</li>
<li>Tested with <a class="reference external" href="http://pypi.python.org/pypi/tox">tox</a> on Python 2.4 - 3.2,
jython and pypy (excluding 3.0)</li>
<li>Added &#8216;build_sphinx&#8217; command to setup.py (requires setuptools or distribute)
Thanks to Florian Bauer</li>
<li>Switched from subversion to mercurial for source code control</li>
<li><a class="reference external" href="http://konryd.blogspot.com/">Konrad Delong</a> added as co-maintainer</li>
</ul>
</div>
<div class="section" id="version-0-7-0-rc-1">
<h2>2011/02/16 Version 0.7.0 RC 1<a class="headerlink" href="#version-0-7-0-rc-1" title="Permalink to this headline"></a></h2>
<p>Changes since beta 4:</p>
<ul class="simple">
<li>Tested with jython, pypy and Python 3.2 and 3.1</li>
<li>Decorated functions / methods have their docstring and <cite>__module__</cite>
preserved on Python 2.4</li>
<li>BUGFIX: <cite>mock.patch</cite> now works correctly with certain types of objects that
proxy attribute access, like the django settings object</li>
<li>BUGFIX: <cite>reset_mock</cite> caused infinite recursion when a mock is set as its own
return value</li>
</ul>
</div>
<div class="section" id="version-0-7-0-beta-4">
<h2>2010/11/12 Version 0.7.0 beta 4<a class="headerlink" href="#version-0-7-0-beta-4" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>patchers (<cite>patch</cite>, <cite>patch.object</cite> and <cite>patch.dict</cite>) have start and stop
methods</li>
<li>Addition of <cite>assert_called_once_with</cite> method</li>
<li>repr of a mock with a spec includes the class name of the spec</li>
<li><cite>assert_called_with</cite> works with <cite>python -OO</cite></li>
<li>New <cite>spec_set</cite> keyword argument to <cite>Mock</cite> and <cite>patch</cite>. If used,
attempting to <em>set</em> an attribute on a mock not on the spec will raise an
<cite>AttributeError</cite></li>
<li>Attributes and return value of a <cite>MagicMock</cite> are <cite>MagicMock</cite> objects</li>
<li>Attempting to set an unsupported magic method now raises an <cite>AttributeError</cite></li>
<li><cite>patch.dict</cite> works as a class decorator</li>
<li>Switched from subversion to mercurial for source code control</li>
<li>BUGFIX: mocks are now copyable (thanks to Ned Batchelder for reporting and
diagnosing this)</li>
<li>BUGFIX: <cite>spec=True</cite> works with old style classes</li>
<li>BUGFIX: <cite>mocksignature=True</cite> can now patch instance methods via
<cite>patch.object</cite></li>
</ul>
</div>
<div class="section" id="version-0-7-0-beta-3">
<h2>2010/09/18 Version 0.7.0 beta 3<a class="headerlink" href="#version-0-7-0-beta-3" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>Using spec with <a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a> only pre-creates magic methods in the spec</li>
<li>Setting a magic method on a mock with a <tt class="docutils literal"><span class="pre">spec</span></tt> can only be done if the
spec has that method</li>
<li>Mocks can now be named (<cite>name</cite> argument to constructor) and the name is used
in the repr</li>
<li><cite>mocksignature</cite> can now be used with classes (signature based on <cite>__init__</cite>)
and callable objects (signature based on <cite>__call__</cite>)</li>
<li>Mocks created with a spec can now pass <cite>isinstance</cite> tests (<cite>__class__</cite>
returns the type of the spec)</li>
<li>Default numeric value for MagicMock is 1 rather than zero (because the
MagicMock bool defaults to True and 0 is False)</li>
<li>Improved failure message for <a class="reference internal" href="mock.html#mock.Mock.assert_called_with" title="mock.Mock.assert_called_with"><tt class="xref py py-meth docutils literal"><span class="pre">assert_called_with()</span></tt></a> when the mock
has not been called at all</li>
<li>Adding the following to the set of supported magic methods:<ul>
<li><tt class="docutils literal"><span class="pre">__getformat__</span></tt> and <tt class="docutils literal"><span class="pre">__setformat__</span></tt></li>
<li>pickle methods</li>
<li><tt class="docutils literal"><span class="pre">__trunc__</span></tt>, <tt class="docutils literal"><span class="pre">__ceil__</span></tt> and <tt class="docutils literal"><span class="pre">__floor__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__sizeof__</span></tt></li>
</ul>
</li>
<li>Added &#8216;build_sphinx&#8217; command to setup.py (requires setuptools or distribute)
Thanks to Florian Bauer</li>
<li>with statement tests now skipped on Python 2.4</li>
<li>Tests require unittest2 to run on Python 2.7</li>
<li>Improved several docstrings and documentation</li>
</ul>
</div>
<div class="section" id="version-0-7-0-beta-2">
<h2>2010/06/23 Version 0.7.0 beta 2<a class="headerlink" href="#version-0-7-0-beta-2" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li><a class="reference internal" href="patch.html#mock.patch.dict" title="mock.patch.dict"><tt class="xref py py-func docutils literal"><span class="pre">patch.dict()</span></tt></a> works as a context manager as well as a decorator</li>
<li><tt class="docutils literal"><span class="pre">patch.dict</span></tt> takes a string to specify dictionary as well as a dictionary
object. If a string is supplied the name specified is imported</li>
<li>BUGFIX: <tt class="docutils literal"><span class="pre">patch.dict</span></tt> restores dictionary even when an exception is raised</li>
</ul>
</div>
<div class="section" id="version-0-7-0-beta-1">
<h2>2010/06/22 Version 0.7.0 beta 1<a class="headerlink" href="#version-0-7-0-beta-1" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>Addition of <tt class="xref py py-func docutils literal"><span class="pre">mocksignature()</span></tt></li>
<li>Ability to mock magic methods</li>
<li>Ability to use <tt class="docutils literal"><span class="pre">patch</span></tt> and <tt class="docutils literal"><span class="pre">patch.object</span></tt> as class decorators</li>
<li>Renamed <tt class="docutils literal"><span class="pre">patch_object</span></tt> to <a class="reference internal" href="patch.html#mock.patch.object" title="mock.patch.object"><tt class="xref py py-func docutils literal"><span class="pre">patch.object()</span></tt></a> (<tt class="docutils literal"><span class="pre">patch_object</span></tt> is
deprecated)</li>
<li>Addition of <a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a> class with all magic methods pre-created for you</li>
<li>Python 3 compatibility (tested with 3.2 but should work with 3.0 &amp; 3.1 as
well)</li>
<li>Addition of <a class="reference internal" href="patch.html#mock.patch.dict" title="mock.patch.dict"><tt class="xref py py-func docutils literal"><span class="pre">patch.dict()</span></tt></a> for changing dictionaries during a test</li>
<li>Addition of <tt class="docutils literal"><span class="pre">mocksignature</span></tt> argument to <tt class="docutils literal"><span class="pre">patch</span></tt> and <tt class="docutils literal"><span class="pre">patch.object</span></tt></li>
<li><tt class="docutils literal"><span class="pre">help(mock)</span></tt> works now (on the module). Can no longer use <tt class="docutils literal"><span class="pre">__bases__</span></tt>
as a valid sentinel name (thanks to Stephen Emslie for reporting and
diagnosing this)</li>
<li>Addition of soft comparisons: <cite>call_args</cite>, <cite>call_args_list</cite> and <cite>method_calls</cite>
now return tuple-like objects which compare equal even when empty args
or kwargs are skipped</li>
<li>Added docstrings.</li>
<li>BUGFIX: <tt class="docutils literal"><span class="pre">side_effect</span></tt> now works with <tt class="docutils literal"><span class="pre">BaseException</span></tt> exceptions like
<tt class="docutils literal"><span class="pre">KeyboardInterrupt</span></tt></li>
<li>BUGFIX: patching the same object twice now restores the patches correctly</li>
<li>The tests now require <a class="reference external" href="http://pypi.python.org/pypi/unittest2">unittest2</a>
to run</li>
<li><a class="reference external" href="http://konryd.blogspot.com/">Konrad Delong</a> added as co-maintainer</li>
</ul>
</div>
<div class="section" id="version-0-6-0">
<h2>2009/08/22 Version 0.6.0<a class="headerlink" href="#version-0-6-0" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>New test layout compatible with test discovery</li>
<li>Descriptors (static methods / class methods etc) can now be patched and
restored correctly</li>
<li>Mocks can raise exceptions when called by setting <tt class="docutils literal"><span class="pre">side_effect</span></tt> to an
exception class or instance</li>
<li>Mocks that wrap objects will not pass on calls to the underlying object if
an explicit return_value is set</li>
</ul>
</div>
<div class="section" id="version-0-5-0">
<h2>2009/04/17 Version 0.5.0<a class="headerlink" href="#version-0-5-0" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>Made DEFAULT part of the public api.</li>
<li>Documentation built with Sphinx.</li>
<li><tt class="docutils literal"><span class="pre">side_effect</span></tt> is now called with the same arguments as the mock is called with and
if returns a non-DEFAULT value that is automatically set as the <tt class="docutils literal"><span class="pre">mock.return_value</span></tt>.</li>
<li><tt class="docutils literal"><span class="pre">wraps</span></tt> keyword argument used for wrapping objects (and passing calls through to the wrapped object).</li>
<li><tt class="docutils literal"><span class="pre">Mock.reset</span></tt> renamed to <tt class="docutils literal"><span class="pre">Mock.reset_mock</span></tt>, as reset is a common API name.</li>
<li><tt class="docutils literal"><span class="pre">patch</span></tt> / <tt class="docutils literal"><span class="pre">patch_object</span></tt> are now context managers and can be used with <tt class="docutils literal"><span class="pre">with</span></tt>.</li>
<li>A new &#8216;create&#8217; keyword argument to patch and patch_object that allows them to patch
(and unpatch) attributes that don&#8217;t exist. (Potentially unsafe to use - it can allow
you to have tests that pass when they are testing an API that doesn&#8217;t exist - use at
your own risk!)</li>
<li>The methods keyword argument to Mock has been removed and merged with spec. The spec
argument can now be a list of methods or an object to take the spec from.</li>
<li>Nested patches may now be applied in a different order (created mocks passed
in the opposite order). This is actually a bugfix.</li>
<li>patch and patch_object now take a spec keyword argument. If spec is
passed in as &#8216;True&#8217; then the Mock created will take the object it is replacing
as its spec object. If the object being replaced is a class, then the return
value for the mock will also use the class as a spec.</li>
<li>A Mock created without a spec will not attempt to mock any magic methods / attributes
(they will raise an <tt class="docutils literal"><span class="pre">AttributeError</span></tt> instead).</li>
</ul>
</div>
<div class="section" id="version-0-4-0">
<h2>2008/10/12 Version 0.4.0<a class="headerlink" href="#version-0-4-0" title="Permalink to this headline"></a></h2>
<ul>
<li><p class="first">Default return value is now a new mock rather than None</p>
</li>
<li><p class="first">return_value added as a keyword argument to the constructor</p>
</li>
<li><p class="first">New method &#8216;assert_called_with&#8217;</p>
</li>
<li><p class="first">Added &#8216;side_effect&#8217; attribute / keyword argument called when mock is called</p>
</li>
<li><p class="first">patch decorator split into two decorators:</p>
<blockquote>
<div><ul class="simple">
<li><tt class="docutils literal"><span class="pre">patch_object</span></tt> which takes an object and an attribute name to patch
(plus optionally a value to patch with which defaults to a mock object)</li>
<li><tt class="docutils literal"><span class="pre">patch</span></tt> which takes a string specifying a target to patch; in the form
&#8216;package.module.Class.attribute&#8217;. (plus optionally a value to
patch with which defaults to a mock object)</li>
</ul>
</div></blockquote>
</li>
<li><p class="first">Can now patch objects with <tt class="docutils literal"><span class="pre">None</span></tt></p>
</li>
<li><p class="first">Change to patch for nose compatibility with error reporting in wrapped functions</p>
</li>
<li><p class="first">Reset no longer clears children / return value etc - it just resets
call count and call args. It also calls reset on all children (and
the return value if it is a mock).</p>
</li>
</ul>
<p>Thanks to Konrad Delong, Kevin Dangoor and others for patches and suggestions.</p>
</div>
<div class="section" id="version-0-3-1">
<h2>2007/12/03 Version 0.3.1<a class="headerlink" href="#version-0-3-1" title="Permalink to this headline"></a></h2>
<p><tt class="docutils literal"><span class="pre">patch</span></tt> maintains the name of decorated functions for compatibility with nose
test autodiscovery.</p>
<p>Tests decorated with <tt class="docutils literal"><span class="pre">patch</span></tt> that use the two argument form (implicit mock
creation) will receive the mock(s) passed in as extra arguments.</p>
<p>Thanks to Kevin Dangoor for these changes.</p>
</div>
<div class="section" id="version-0-3-0">
<h2>2007/11/30 Version 0.3.0<a class="headerlink" href="#version-0-3-0" title="Permalink to this headline"></a></h2>
<p>Removed <tt class="docutils literal"><span class="pre">patch_module</span></tt>. <tt class="docutils literal"><span class="pre">patch</span></tt> can now take a string as the first
argument for patching modules.</p>
<p>The third argument to <tt class="docutils literal"><span class="pre">patch</span></tt> is optional - a mock will be created by
default if it is not passed in.</p>
</div>
<div class="section" id="version-0-2-1">
<h2>2007/11/21 Version 0.2.1<a class="headerlink" href="#version-0-2-1" title="Permalink to this headline"></a></h2>
<p>Bug fix, allows reuse of functions decorated with <tt class="docutils literal"><span class="pre">patch</span></tt> and <tt class="docutils literal"><span class="pre">patch_module</span></tt>.</p>
</div>
<div class="section" id="version-0-2-0">
<h2>2007/11/20 Version 0.2.0<a class="headerlink" href="#version-0-2-0" title="Permalink to this headline"></a></h2>
<p>Added <tt class="docutils literal"><span class="pre">spec</span></tt> keyword argument for creating <tt class="docutils literal"><span class="pre">Mock</span></tt> objects from a
specification object.</p>
<p>Added <tt class="docutils literal"><span class="pre">patch</span></tt> and <tt class="docutils literal"><span class="pre">patch_module</span></tt> monkey patching decorators.</p>
<p>Added <tt class="docutils literal"><span class="pre">sentinel</span></tt> for convenient access to unique objects.</p>
<p>Distribution includes unit tests.</p>
</div>
<div class="section" id="version-0-1-0">
<h2>2007/11/19 Version 0.1.0<a class="headerlink" href="#version-0-1-0" title="Permalink to this headline"></a></h2>
<p>Initial release.</p>
</div>
</div>
<div class="section" id="todo-and-limitations">
<h1>TODO and Limitations<a class="headerlink" href="#todo-and-limitations" title="Permalink to this headline"></a></h1>
<p>Contributions, bug reports and comments welcomed!</p>
<p>Feature requests and bug reports are handled on the issue tracker:</p>
<blockquote>
<div><ul class="simple">
<li><a class="reference external" href="http://code.google.com/p/mock/issues/list">mock issue tracker</a></li>
</ul>
</div></blockquote>
<p><cite>wraps</cite> is not integrated with magic methods.</p>
<p><cite>patch</cite> could auto-do the patching in the constructor and unpatch in the
destructor. This would be useful in itself, but violates TOOWTDI and would be
unsafe for IronPython &amp; PyPy (non-deterministic calling of destructors).
Destructors aren&#8217;t called in CPython where there are cycles, but a weak
reference with a callback can be used to get round this.</p>
<p><cite>Mock</cite> has several attributes. This makes it unsuitable for mocking objects
that use these attribute names. A way round this would be to provide methods
that <em>hide</em> these attributes when needed. In 0.8 many, but not all, of these
attributes are renamed to gain a <cite>_mock</cite> prefix, making it less likely that
they will clash. Any outstanding attributes that haven&#8217;t been modified with
the prefix should be changed.</p>
<p>If a patch is started using <cite>patch.start</cite> and then not stopped correctly then
the unpatching is not done. Using weak references it would be possible to
detect and fix this when the patch object itself is garbage collected. This
would be tricky to get right though.</p>
<p>When a <cite>Mock</cite> is created by <cite>patch</cite>, arbitrary keywords can be used to set
attributes. If <cite>patch</cite> is created with a <cite>spec</cite>, and is replacing a class, then
a <cite>return_value</cite> mock is created. The keyword arguments are not applied to the
child mock, but could be.</p>
<p>When mocking a class with <cite>patch</cite>, passing in <cite>spec=True</cite> or <cite>autospec=True</cite>,
the mock class has an instance created from the same spec. Should this be the
default behaviour for mocks anyway (mock return values inheriting the spec
from their parent), or should it be controlled by an additional keyword
argument (<cite>inherit</cite>) to the Mock constructor? <cite>create_autospec</cite> does this, so
an additional keyword argument to Mock is probably unnecessary.</p>
<p>The <cite>mocksignature</cite> argument to <cite>patch</cite> with a non <cite>Mock</cite> passed into
<cite>new_callable</cite> will <em>probably</em> cause an error. Should it just be invalid?</p>
<p>Note that <cite>NonCallableMock</cite> and <cite>NonCallableMagicMock</cite> still have the unused
(and unusable) attributes: <cite>return_value</cite>, <cite>side_effect</cite>, <cite>call_count</cite>,
<cite>call_args</cite> and <cite>call_args_list</cite>. These could be removed or raise errors on
getting / setting. They also have the <cite>assert_called_with</cite> and
<cite>assert_called_once_with</cite> methods. Removing these would be pointless as
fetching them would create a mock (attribute) that could be called without
error.</p>
<p>Some outstanding technical debt. The way autospeccing mocks function
signatures was copied and modified from <cite>mocksignature</cite>. This could all be
refactored into one set of functions instead of two. The way we tell if
patchers are started and if a patcher is being used for a <cite>patch.multiple</cite>
call are both horrible. There are now a host of helper functions that should
be rationalised. (Probably time to split mock into a package instead of a
module.)</p>
<p>Passing arbitrary keyword arguments to <cite>create_autospec</cite>, or <cite>patch</cite> with
<cite>autospec</cite>, when mocking a <em>function</em> works fine. However, the arbitrary
attributes are set on the created mock - but <cite>create_autospec</cite> returns a
real function (which doesn&#8217;t have those attributes). However, what is the use
case for using autospec to create functions with attributes that don&#8217;t exist
on the original?</p>
<p><cite>mocksignature</cite>, plus the <cite>call_args_list</cite> and <cite>method_calls</cite> attributes of
<cite>Mock</cite> could all be deprecated.</p>
</div>
</div>
</div>
</div>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">CHANGELOG</a><ul>
<li><a class="reference internal" href="#version-1-0-0">2012/10/07 Version 1.0.0</a></li>
<li><a class="reference internal" href="#version-1-0-0-beta-1">2012/07/13 Version 1.0.0 beta 1</a></li>
<li><a class="reference internal" href="#version-1-0-0-alpha-2">2012/05/04 Version 1.0.0 alpha 2</a></li>
<li><a class="reference internal" href="#version-1-0-0-alpha-1">2012/03/25 Version 1.0.0 alpha 1</a></li>
<li><a class="reference internal" href="#version-0-8-0">2012/02/13 Version 0.8.0</a></li>
<li><a class="reference internal" href="#version-0-8-0-release-candidate-2">2012/01/10 Version 0.8.0 release candidate 2</a></li>
<li><a class="reference internal" href="#version-0-8-0-release-candidate-1">2011/12/29 Version 0.8.0 release candidate 1</a></li>
<li><a class="reference internal" href="#version-0-8-0-beta-4">2011/10/09 Version 0.8.0 beta 4</a></li>
<li><a class="reference internal" href="#version-0-8-0-beta-3">2011/08/15 Version 0.8.0 beta 3</a></li>
<li><a class="reference internal" href="#version-0-8-0-beta-2">2011/08/05 Version 0.8.0 beta 2</a></li>
<li><a class="reference internal" href="#version-0-8-0-beta-1">2011/07/25 Version 0.8.0 beta 1</a></li>
<li><a class="reference internal" href="#version-0-8-0-alpha-2">2011/07/16 Version 0.8.0 alpha 2</a></li>
<li><a class="reference internal" href="#version-0-8-0-alpha-1">2011/06/14 Version 0.8.0 alpha 1</a></li>
<li><a class="reference internal" href="#version-0-7-2">2011/05/30 Version 0.7.2</a></li>
<li><a class="reference internal" href="#version-0-7-1">2011/05/06 Version 0.7.1</a></li>
<li><a class="reference internal" href="#version-0-7-0">2011/03/05 Version 0.7.0</a></li>
<li><a class="reference internal" href="#version-0-7-0-rc-1">2011/02/16 Version 0.7.0 RC 1</a></li>
<li><a class="reference internal" href="#version-0-7-0-beta-4">2010/11/12 Version 0.7.0 beta 4</a></li>
<li><a class="reference internal" href="#version-0-7-0-beta-3">2010/09/18 Version 0.7.0 beta 3</a></li>
<li><a class="reference internal" href="#version-0-7-0-beta-2">2010/06/23 Version 0.7.0 beta 2</a></li>
<li><a class="reference internal" href="#version-0-7-0-beta-1">2010/06/22 Version 0.7.0 beta 1</a></li>
<li><a class="reference internal" href="#version-0-6-0">2009/08/22 Version 0.6.0</a></li>
<li><a class="reference internal" href="#version-0-5-0">2009/04/17 Version 0.5.0</a></li>
<li><a class="reference internal" href="#version-0-4-0">2008/10/12 Version 0.4.0</a></li>
<li><a class="reference internal" href="#version-0-3-1">2007/12/03 Version 0.3.1</a></li>
<li><a class="reference internal" href="#version-0-3-0">2007/11/30 Version 0.3.0</a></li>
<li><a class="reference internal" href="#version-0-2-1">2007/11/21 Version 0.2.1</a></li>
<li><a class="reference internal" href="#version-0-2-0">2007/11/20 Version 0.2.0</a></li>
<li><a class="reference internal" href="#version-0-1-0">2007/11/19 Version 0.1.0</a></li>
</ul>
</li>
<li><a class="reference internal" href="#todo-and-limitations">TODO and Limitations</a></li>
</ul>
<h4>Previous topic</h4>
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<div class="section" id="mock-library-comparison">
<h1>Mock Library Comparison<a class="headerlink" href="#mock-library-comparison" title="Permalink to this headline"></a></h1>
<p>A side-by-side comparison of how to accomplish some basic tasks with mock and
some other popular Python mocking libraries and frameworks.</p>
<p>These are:</p>
<ul class="simple">
<li><a class="reference external" href="http://pypi.python.org/pypi/flexmock">flexmock</a></li>
<li><a class="reference external" href="http://pypi.python.org/pypi/mox">mox</a></li>
<li><a class="reference external" href="http://niemeyer.net/mocker">Mocker</a></li>
<li><a class="reference external" href="http://pypi.python.org/pypi/dingus">dingus</a></li>
<li><a class="reference external" href="http://pypi.python.org/pypi/fudge">fudge</a></li>
</ul>
<p>Popular python mocking frameworks not yet represented here include
<a class="reference external" href="http://pypi.python.org/pypi/MiniMock">MiniMock</a>.</p>
<p><a class="reference external" href="http://pmock.sourceforge.net/">pMock</a> (last release 2004 and doesn&#8217;t import
in recent versions of Python) and
<a class="reference external" href="http://python-mock.sourceforge.net/">python-mock</a> (last release 2005) are
intentionally omitted.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>A more up to date, and tested for all mock libraries (only the mock
examples on this page can be executed as doctests) version of this
comparison is maintained by Gary Bernhardt:</p>
<ul class="last simple">
<li><a class="reference external" href="http://garybernhardt.github.com/python-mock-comparison/">Python Mock Library Comparison</a></li>
</ul>
</div>
<p>This comparison is by no means complete, and also may not be fully idiomatic
for all the libraries represented. <em>Please</em> contribute corrections, missing
comparisons, or comparisons for additional libraries to the <a class="reference external" href="https://code.google.com/p/mock/issues/list">mock issue
tracker</a>.</p>
<p>This comparison page was originally created by the <a class="reference external" href="https://code.google.com/p/pymox/wiki/MoxComparison">Mox project</a> and then extended for
<a class="reference external" href="http://has207.github.com/flexmock/compare.html">flexmock and mock</a> by
Herman Sheremetyev. Dingus examples written by <a class="reference external" href="http://garybernhardt.github.com/python-mock-comparison/">Gary Bernhadt</a>. fudge examples
provided by <a class="reference external" href="http://farmdev.com/">Kumar McMillan</a>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>The examples tasks here were originally created by Mox which is a mocking
<em>framework</em> rather than a library like mock. The tasks shown naturally
exemplify tasks that frameworks are good at and not the ones they make
harder. In particular you can take a <cite>Mock</cite> or <cite>MagicMock</cite> object and use
it in any way you want with no up-front configuration. The same is also
true for Dingus.</p>
<p class="last">The examples for mock here assume version 0.7.0.</p>
</div>
<div class="section" id="simple-fake-object">
<h2>Simple fake object<a class="headerlink" href="#simple-fake-object" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&quot;calculated value&quot;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_attribute</span> <span class="o">=</span> <span class="s">&quot;value&quot;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;calculated value&quot;</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">flexmock</span><span class="p">(</span><span class="n">some_method</span><span class="o">=</span><span class="k">lambda</span><span class="p">:</span> <span class="s">&quot;calculated value&quot;</span><span class="p">,</span> <span class="n">some_attribute</span><span class="o">=</span><span class="s">&quot;value&quot;</span><span class="p">)</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;calculated value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span>
<span class="c"># Mox</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">&quot;calculated value&quot;</span><span class="p">)</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span> <span class="o">=</span> <span class="s">&quot;value&quot;</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;calculated value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span>
<span class="c"># Mocker</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">&quot;calculated value&quot;</span><span class="p">)</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span> <span class="o">=</span> <span class="s">&quot;value&quot;</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;calculated value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">(</span><span class="n">some_attribute</span><span class="o">=</span><span class="s">&quot;value&quot;</span><span class="p">,</span>
<span class="gp">... </span> <span class="n">some_method__returns</span><span class="o">=</span><span class="s">&quot;calculated value&quot;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;calculated value&quot;</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_fake</span> <span class="o">=</span> <span class="p">(</span><span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">provides</span><span class="p">(</span><span class="s">&#39;some_method&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="s">&quot;calculated value&quot;</span><span class="p">)</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">has_attr</span><span class="p">(</span><span class="n">some_attribute</span><span class="o">=</span><span class="s">&quot;value&quot;</span><span class="p">))</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;calculated value&quot;</span><span class="p">,</span> <span class="n">my_fake</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">my_fake</span><span class="o">.</span><span class="n">some_attribute</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="simple-mock">
<h2>Simple mock<a class="headerlink" href="#simple-mock" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&quot;value&quot;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">flexmock</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">&quot;some_method&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">once</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="c"># Mox</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">)</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="c"># Mocker</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">)</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">verify</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">(</span><span class="n">some_method__returns</span><span class="o">=</span><span class="s">&quot;value&quot;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">calls</span><span class="p">()</span><span class="o">.</span><span class="n">once</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@fudge.test</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
<span class="gp">... </span> <span class="n">my_fake</span> <span class="o">=</span> <span class="p">(</span><span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">&#39;some_method&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">)</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">times_called</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">AssertionError</span>: <span class="n">fake:my_fake.some_method() was not called</span>
</pre></div>
</div>
</div>
<div class="section" id="creating-partial-mocks">
<h2>Creating partial mocks<a class="headerlink" href="#creating-partial-mocks" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">SomeObject</span><span class="o">.</span><span class="n">some_method</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="s">&#39;value&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">SomeObject</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span>
<span class="n">flexmock</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">&quot;some_method&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">&#39;value&#39;</span><span class="p">)</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="c"># Mox</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockObject</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">)</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="c"># Mocker</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span>
<span class="n">mock</span><span class="o">.</span><span class="n">Get</span><span class="p">()</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">)</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">verify</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">object</span> <span class="o">=</span> <span class="n">SomeObject</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">object</span><span class="o">.</span><span class="n">some_method</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="s">&quot;value&quot;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;value&quot;</span><span class="p">,</span> <span class="nb">object</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">fake</span> <span class="o">=</span> <span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span><span class="o">.</span><span class="n">is_callable</span><span class="p">()</span><span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="s">&quot;&lt;fudge-value&gt;&quot;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">fudge</span><span class="o">.</span><span class="n">patched_context</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">,</span> <span class="s">&#39;some_method&#39;</span><span class="p">,</span> <span class="n">fake</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">s</span> <span class="o">=</span> <span class="n">SomeObject</span><span class="p">()</span>
<span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;&lt;fudge-value&gt;&quot;</span><span class="p">,</span> <span class="n">s</span><span class="o">.</span><span class="n">some_method</span><span class="p">())</span>
<span class="gp">...</span>
</pre></div>
</div>
</div>
<div class="section" id="ensure-calls-are-made-in-specific-order">
<h2>Ensure calls are made in specific order<a class="headerlink" href="#ensure-calls-are-made-in-specific-order" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">(</span><span class="n">spec</span><span class="o">=</span><span class="n">SomeObject</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span>
<span class="go">&lt;Mock name=&#39;mock.method1()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span>
<span class="go">&lt;Mock name=&#39;mock.method2()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="n">my_mock</span><span class="o">.</span><span class="n">mock_calls</span><span class="p">,</span> <span class="p">[</span><span class="n">call</span><span class="o">.</span><span class="n">method1</span><span class="p">(),</span> <span class="n">call</span><span class="o">.</span><span class="n">method2</span><span class="p">()])</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">flexmock</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span>
<span class="n">mock</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">&#39;method1&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">once</span><span class="o">.</span><span class="n">ordered</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">&#39;first thing&#39;</span><span class="p">)</span>
<span class="n">mock</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">&#39;method2&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">once</span><span class="o">.</span><span class="n">ordered</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">&#39;second thing&#39;</span><span class="p">)</span>
<span class="c"># Mox</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockObject</span><span class="p">(</span><span class="n">SomeObject</span><span class="p">)</span>
<span class="n">mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">&#39;first thing&#39;</span><span class="p">)</span>
<span class="n">mock</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">&#39;second thing&#39;</span><span class="p">)</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="c"># Mocker</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span>
<span class="k">with</span> <span class="n">mocker</span><span class="o">.</span><span class="n">order</span><span class="p">():</span>
<span class="n">mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">&#39;first thing&#39;</span><span class="p">)</span>
<span class="n">mock</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="s">&#39;second thing&#39;</span><span class="p">)</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">verify</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span>
<span class="go">&lt;Dingus ...&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span>
<span class="go">&lt;Dingus ...&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">([</span><span class="s">&#39;method1&#39;</span><span class="p">,</span> <span class="s">&#39;method2&#39;</span><span class="p">],</span> <span class="p">[</span><span class="n">call</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">call</span> <span class="ow">in</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">calls</span><span class="p">])</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@fudge.test</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
<span class="gp">... </span> <span class="n">my_fake</span> <span class="o">=</span> <span class="p">(</span><span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">remember_order</span><span class="p">()</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">&#39;method1&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">&#39;method2&#39;</span><span class="p">))</span>
<span class="gp">... </span> <span class="n">my_fake</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span>
<span class="gp">... </span> <span class="n">my_fake</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">AssertionError: Call #1 was fake:my_fake.method2(); Expected</span>: <span class="n">#1 fake:my_fake.method1(), #2 fake:my_fake.method2(), end</span>
</pre></div>
</div>
</div>
<div class="section" id="raising-exceptions">
<h2>Raising exceptions<a class="headerlink" href="#raising-exceptions" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="n">SomeException</span><span class="p">(</span><span class="s">&quot;message&quot;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">flexmock</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">&quot;some_method&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">and_raise</span><span class="p">(</span><span class="n">SomeException</span><span class="p">(</span><span class="s">&quot;message&quot;</span><span class="p">))</span>
<span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span>
<span class="c"># Mox</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span><span class="o">.</span><span class="n">AndRaise</span><span class="p">(</span><span class="n">SomeException</span><span class="p">(</span><span class="s">&quot;message&quot;</span><span class="p">))</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="c"># Mocker</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">throw</span><span class="p">(</span><span class="n">SomeException</span><span class="p">(</span><span class="s">&quot;message&quot;</span><span class="p">))</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">replay</span><span class="p">()</span>
<span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">verify</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">exception_raiser</span><span class="p">(</span><span class="n">SomeException</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertRaises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_fake</span> <span class="o">=</span> <span class="p">(</span><span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">is_callable</span><span class="p">()</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">raises</span><span class="p">(</span><span class="n">SomeException</span><span class="p">(</span><span class="s">&quot;message&quot;</span><span class="p">)))</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_fake</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">SomeException</span>: <span class="n">message</span>
</pre></div>
</div>
</div>
<div class="section" id="override-new-instances-of-a-class">
<h2>Override new instances of a class<a class="headerlink" href="#override-new-instances-of-a-class" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">mock</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">&#39;somemodule.Someclass&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">MockClass</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">MockClass</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="n">some_other_object</span>
<span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">somemodule</span><span class="o">.</span><span class="n">Someclass</span><span class="p">())</span>
<span class="gp">...</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span>
<span class="n">flexmock</span><span class="p">(</span><span class="n">some_module</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">,</span> <span class="n">new_instances</span><span class="o">=</span><span class="n">some_other_object</span><span class="p">)</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">some_module</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">())</span>
<span class="c"># Mox</span>
<span class="c"># (you will probably have mox.Mox() available as self.mox in a real test)</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Mox</span><span class="p">()</span><span class="o">.</span><span class="n">StubOutWithMock</span><span class="p">(</span><span class="n">some_module</span><span class="p">,</span> <span class="s">&#39;SomeClass&#39;</span><span class="p">,</span> <span class="n">use_mock_anything</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">some_module</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">)</span>
<span class="n">mox</span><span class="o">.</span><span class="n">ReplayAll</span><span class="p">()</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">some_module</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">())</span>
<span class="c"># Mocker</span>
<span class="n">instance</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">mock</span><span class="p">()</span>
<span class="n">klass</span> <span class="o">=</span> <span class="n">mocker</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">SomeClass</span><span class="p">,</span> <span class="n">spec</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="n">klass</span><span class="p">(</span><span class="s">&#39;expected&#39;</span><span class="p">,</span> <span class="s">&#39;args&#39;</span><span class="p">)</span>
<span class="n">mocker</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="n">instance</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MockClass</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="n">some_other_object</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">dingus</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">&#39;somemodule.SomeClass&#39;</span><span class="p">,</span> <span class="n">MockClass</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">somemodule</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">())</span>
<span class="gp">...</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@fudge.patch</span><span class="p">(</span><span class="s">&#39;somemodule.SomeClass&#39;</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="n">FakeClass</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">FakeClass</span><span class="o">.</span><span class="n">is_callable</span><span class="p">()</span><span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="n">some_other_object</span><span class="p">,</span> <span class="n">somemodule</span><span class="o">.</span><span class="n">SomeClass</span><span class="p">())</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="call-the-same-method-multiple-times">
<h2>Call the same method multiple times<a class="headerlink" href="#call-the-same-method-multiple-times" title="Permalink to this headline"></a></h2>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">You don&#8217;t need to do <em>any</em> configuration to call <cite>mock.Mock()</cite> methods
multiple times. Attributes like <cite>call_count</cite>, <cite>call_args_list</cite> and
<cite>method_calls</cite> provide various different ways of making assertions about
how the mock was used.</p>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span>
<span class="go">&lt;Mock name=&#39;mock.some_method()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span>
<span class="go">&lt;Mock name=&#39;mock.some_method()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">some_method</span><span class="o">.</span><span class="n">call_count</span> <span class="o">&gt;=</span> <span class="mi">2</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock # (verifies that the method gets called at least twice)</span>
<span class="n">flexmock</span><span class="p">(</span><span class="n">some_object</span><span class="p">)</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span><span class="s">&#39;some_method&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">at_least</span><span class="o">.</span><span class="n">twice</span>
<span class="c"># Mox</span>
<span class="c"># (does not support variable number of calls, so you need to create a new entry for each explicit call)</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockObject</span><span class="p">(</span><span class="n">some_object</span><span class="p">)</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">(</span><span class="n">mox</span><span class="o">.</span><span class="n">IgnoreArg</span><span class="p">(),</span> <span class="n">mox</span><span class="o">.</span><span class="n">IgnoreArg</span><span class="p">())</span>
<span class="n">mock</span><span class="o">.</span><span class="n">some_method</span><span class="p">(</span><span class="n">mox</span><span class="o">.</span><span class="n">IgnoreArg</span><span class="p">(),</span> <span class="n">mox</span><span class="o">.</span><span class="n">IgnoreArg</span><span class="p">())</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Replay</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="n">mox</span><span class="o">.</span><span class="n">Verify</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="c"># Mocker</span>
<span class="c"># (TODO)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span>
<span class="go">&lt;Dingus ...&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span>
<span class="go">&lt;Dingus ...&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">my_dingus</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="s">&#39;some_method&#39;</span><span class="p">))</span> <span class="o">==</span> <span class="mi">2</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@fudge.test</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
<span class="gp">... </span> <span class="n">my_fake</span> <span class="o">=</span> <span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span><span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">&#39;some_method&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">times_called</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">my_fake</span><span class="o">.</span><span class="n">some_method</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">AssertionError</span>: <span class="n">fake:my_fake.some_method() was called 1 time(s). Expected 2.</span>
</pre></div>
</div>
</div>
<div class="section" id="mock-chained-methods">
<h2>Mock chained methods<a class="headerlink" href="#mock-chained-methods" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">method3</span> <span class="o">=</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">method1</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">method2</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">method3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">method3</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;some value&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&#39;some value&#39;</span><span class="p">,</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">method3</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Flexmock</span>
<span class="c"># (intermediate method calls are automatically assigned to temporary fake objects</span>
<span class="c"># and can be called with any arguments)</span>
<span class="n">flexmock</span><span class="p">(</span><span class="n">some_object</span><span class="p">)</span><span class="o">.</span><span class="n">should_receive</span><span class="p">(</span>
<span class="s">&#39;method1.method2.method3&#39;</span>
<span class="p">)</span><span class="o">.</span><span class="n">with_args</span><span class="p">(</span><span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">)</span><span class="o">.</span><span class="n">and_return</span><span class="p">(</span><span class="s">&#39;some value&#39;</span><span class="p">)</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&#39;some_value&#39;</span><span class="p">,</span> <span class="n">some_object</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">))</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Mox</span>
<span class="n">mock</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockObject</span><span class="p">(</span><span class="n">some_object</span><span class="p">)</span>
<span class="n">mock2</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span>
<span class="n">mock3</span> <span class="o">=</span> <span class="n">mox</span><span class="o">.</span><span class="n">MockAnything</span><span class="p">()</span>
<span class="n">mock</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="n">mock1</span><span class="p">)</span>
<span class="n">mock2</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="n">mock2</span><span class="p">)</span>
<span class="n">mock3</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">)</span><span class="o">.</span><span class="n">AndReturn</span><span class="p">(</span><span class="s">&#39;some_value&#39;</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">mox</span><span class="o">.</span><span class="n">ReplayAll</span><span class="p">()</span>
<span class="n">assertEqual</span><span class="p">(</span><span class="s">&quot;some_value&quot;</span><span class="p">,</span> <span class="n">some_object</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">mox</span><span class="o">.</span><span class="n">VerifyAll</span><span class="p">()</span>
<span class="c"># Mocker</span>
<span class="c"># (TODO)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">method3</span> <span class="o">=</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">method1</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">method2</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">method3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">method3</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;some value&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">assertEqual</span><span class="p">(</span><span class="s">&#39;some value&#39;</span><span class="p">,</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">method3</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="s">&#39;()&#39;</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">once</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@fudge.test</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
<span class="gp">... </span> <span class="n">my_fake</span> <span class="o">=</span> <span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span>
<span class="gp">... </span> <span class="p">(</span><span class="n">my_fake</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">&#39;method1&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">returns_fake</span><span class="p">()</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">&#39;method2&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">returns_fake</span><span class="p">()</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">expects</span><span class="p">(</span><span class="s">&#39;method3&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">with_args</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="gp">... </span> <span class="o">.</span><span class="n">returns</span><span class="p">(</span><span class="s">&#39;some value&#39;</span><span class="p">))</span>
<span class="gp">... </span> <span class="n">assertEqual</span><span class="p">(</span><span class="s">&#39;some value&#39;</span><span class="p">,</span> <span class="n">my_fake</span><span class="o">.</span><span class="n">method1</span><span class="p">()</span><span class="o">.</span><span class="n">method2</span><span class="p">()</span><span class="o">.</span><span class="n">method3</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="mocking-a-context-manager">
<h2>Mocking a context manager<a class="headerlink" href="#mocking-a-context-manager" title="Permalink to this headline"></a></h2>
<p>Examples for mock, Dingus and fudge only (so far):</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">my_mock</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">__enter__</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">__exit__</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus (nothing special here; all dinguses are &quot;magic mocks&quot;)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">my_dingus</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">__enter__</span><span class="o">.</span><span class="n">calls</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">__exit__</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="s">&#39;()&#39;</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_fake</span> <span class="o">=</span> <span class="n">fudge</span><span class="o">.</span><span class="n">Fake</span><span class="p">()</span><span class="o">.</span><span class="n">provides</span><span class="p">(</span><span class="s">&#39;__enter__&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">provides</span><span class="p">(</span><span class="s">&#39;__exit__&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">my_fake</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
</pre></div>
</div>
</div>
<div class="section" id="mocking-the-builtin-open-used-as-a-context-manager">
<h2>Mocking the builtin open used as a context manager<a class="headerlink" href="#mocking-the-builtin-open-used-as-a-context-manager" title="Permalink to this headline"></a></h2>
<p>Example for mock only (so far):</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">mock</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">&#39;__builtin__.open&#39;</span><span class="p">,</span> <span class="n">my_mock</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">manager</span> <span class="o">=</span> <span class="n">my_mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">__enter__</span><span class="o">.</span><span class="n">return_value</span>
<span class="gp">... </span> <span class="n">manager</span><span class="o">.</span><span class="n">read</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;some data&#39;</span>
<span class="gp">... </span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">h</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">data</span> <span class="o">=</span> <span class="n">h</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">data</span>
<span class="go">&#39;some data&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p><em>or</em>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">mock</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">&#39;__builtin__.open&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">my_mock</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">my_mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">__enter__</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">s</span><span class="p">:</span> <span class="n">s</span>
<span class="gp">... </span> <span class="n">my_mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">__exit__</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">Mock</span><span class="p">()</span>
<span class="gp">... </span> <span class="n">my_mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">read</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;some data&#39;</span>
<span class="gp">... </span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">h</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">data</span> <span class="o">=</span> <span class="n">h</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">data</span>
<span class="go">&#39;some data&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_mock</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># Dingus</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">my_dingus</span> <span class="o">=</span> <span class="n">dingus</span><span class="o">.</span><span class="n">Dingus</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">dingus</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">&#39;__builtin__.open&#39;</span><span class="p">,</span> <span class="n">my_dingus</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">file_</span> <span class="o">=</span> <span class="nb">open</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">__enter__</span><span class="o">.</span><span class="n">return_value</span>
<span class="gp">... </span> <span class="n">file_</span><span class="o">.</span><span class="n">read</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;some data&#39;</span>
<span class="gp">... </span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">h</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">data</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">data</span>
<span class="go">&#39;some data&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">my_dingus</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="s">&#39;()&#39;</span><span class="p">,</span> <span class="s">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">once</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="c"># fudge</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">contextlib</span> <span class="kn">import</span> <span class="n">contextmanager</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">StringIO</span> <span class="kn">import</span> <span class="n">StringIO</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@contextmanager</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">fake_file</span><span class="p">(</span><span class="n">filename</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">yield</span> <span class="n">StringIO</span><span class="p">(</span><span class="s">&#39;sekrets&#39;</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">fudge</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s">&#39;__builtin__.open&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">fake_open</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">fake_open</span><span class="o">.</span><span class="n">is_callable</span><span class="p">()</span><span class="o">.</span><span class="n">calls</span><span class="p">(</span><span class="n">fake_file</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s">&#39;/etc/password&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">data</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="gp">...</span>
<span class="go">fake:__builtin__.open</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">data</span>
<span class="go">&#39;sekrets&#39;</span>
</pre></div>
</div>
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<ul>
<li><a class="reference internal" href="#">Mock Library Comparison</a><ul>
<li><a class="reference internal" href="#simple-fake-object">Simple fake object</a></li>
<li><a class="reference internal" href="#simple-mock">Simple mock</a></li>
<li><a class="reference internal" href="#creating-partial-mocks">Creating partial mocks</a></li>
<li><a class="reference internal" href="#ensure-calls-are-made-in-specific-order">Ensure calls are made in specific order</a></li>
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<li><a class="reference internal" href="#mock-chained-methods">Mock chained methods</a></li>
<li><a class="reference internal" href="#mocking-a-context-manager">Mocking a context manager</a></li>
<li><a class="reference internal" href="#mocking-the-builtin-open-used-as-a-context-manager">Mocking the builtin open used as a context manager</a></li>
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<div class="section" id="getting-started-with-mock">
<h1>Getting Started with Mock<a class="headerlink" href="#getting-started-with-mock" title="Permalink to this headline"></a></h1>
<span class="target" id="getting-started"></span><span class="target" id="index-0"></span><div class="section" id="using-mock">
<h2>Using Mock<a class="headerlink" href="#using-mock" title="Permalink to this headline"></a></h2>
<div class="section" id="mock-patching-methods">
<h3>Mock Patching Methods<a class="headerlink" href="#mock-patching-methods" title="Permalink to this headline"></a></h3>
<p>Common uses for <tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt> objects include:</p>
<ul class="simple">
<li>Patching methods</li>
<li>Recording method calls on objects</li>
</ul>
<p>You might want to replace a method on an object to check that
it is called with the correct arguments by another part of the system:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">real</span> <span class="o">=</span> <span class="n">SomeClass</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">method</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;method&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="n">key</span><span class="o">=</span><span class="s">&#39;value&#39;</span><span class="p">)</span>
<span class="go">&lt;MagicMock name=&#39;method()&#39; id=&#39;...&#39;&gt;</span>
</pre></div>
</div>
<p>Once our mock has been used (<cite>real.method</cite> in this example) it has methods
and attributes that allow you to make assertions about how it has been used.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">In most of these examples the <tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt> and <tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt> classes
are interchangeable. As the <cite>MagicMock</cite> is the more capable class it makes
a sensible one to use by default.</p>
</div>
<p>Once the mock has been called its <tt class="xref py py-attr docutils literal"><span class="pre">called</span></tt> attribute is set to
<cite>True</cite>. More importantly we can use the <tt class="xref py py-meth docutils literal"><span class="pre">assert_called_with()</span></tt> or
<tt class="xref py py-meth docutils literal"><span class="pre">assert_called_once_with()</span></tt> method to check that it was called with
the correct arguments.</p>
<p>This example tests that calling <cite>ProductionClass().method</cite> results in a call to
the <cite>something</cite> method:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">mock</span> <span class="kn">import</span> <span class="n">MagicMock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">ProductionClass</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">method</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">something</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">something</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span> <span class="o">=</span> <span class="n">ProductionClass</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">something</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">something</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="mock-for-method-calls-on-an-object">
<h3>Mock for Method Calls on an Object<a class="headerlink" href="#mock-for-method-calls-on-an-object" title="Permalink to this headline"></a></h3>
<p>In the last example we patched a method directly on an object to check that it
was called correctly. Another common use case is to pass an object into a
method (or some part of the system under test) and then check that it is used
in the correct way.</p>
<p>The simple <cite>ProductionClass</cite> below has a <cite>closer</cite> method. If it is called with
an object then it calls <cite>close</cite> on it.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">ProductionClass</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">closer</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">something</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">something</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="gp">...</span>
</pre></div>
</div>
<p>So to test it we need to pass in an object with a <cite>close</cite> method and check
that it was called correctly.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">real</span> <span class="o">=</span> <span class="n">ProductionClass</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">closer</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">close</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">()</span>
</pre></div>
</div>
<p>We don&#8217;t have to do any work to provide the &#8216;close&#8217; method on our mock.
Accessing close creates it. So, if &#8216;close&#8217; hasn&#8217;t already been called then
accessing it in the test will create it, but <tt class="xref py py-meth docutils literal"><span class="pre">assert_called_with()</span></tt>
will raise a failure exception.</p>
</div>
<div class="section" id="mocking-classes">
<h3>Mocking Classes<a class="headerlink" href="#mocking-classes" title="Permalink to this headline"></a></h3>
<p>A common use case is to mock out classes instantiated by your code under test.
When you patch a class, then that class is replaced with a mock. Instances
are created by <em>calling the class</em>. This means you access the &#8220;mock instance&#8221;
by looking at the return value of the mocked class.</p>
<p>In the example below we have a function <cite>some_function</cite> that instantiates <cite>Foo</cite>
and calls a method on it. The call to <cite>patch</cite> replaces the class <cite>Foo</cite> with a
mock. The <cite>Foo</cite> instance is the result of calling the mock, so it is configured
by modifying the mock <tt class="xref py py-attr docutils literal"><span class="pre">return_value</span></tt>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">some_function</span><span class="p">():</span>
<span class="gp">... </span> <span class="n">instance</span> <span class="o">=</span> <span class="n">module</span><span class="o">.</span><span class="n">Foo</span><span class="p">()</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;module.Foo&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">mock</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">instance</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">return_value</span>
<span class="gp">... </span> <span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;the result&#39;</span>
<span class="gp">... </span> <span class="n">result</span> <span class="o">=</span> <span class="n">some_function</span><span class="p">()</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">result</span> <span class="o">==</span> <span class="s">&#39;the result&#39;</span>
</pre></div>
</div>
</div>
<div class="section" id="naming-your-mocks">
<h3>Naming your mocks<a class="headerlink" href="#naming-your-mocks" title="Permalink to this headline"></a></h3>
<p>It can be useful to give your mocks a name. The name is shown in the repr of
the mock and can be helpful when the mock appears in test failure messages. The
name is also propagated to attributes or methods of the mock:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foo&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span>
<span class="go">&lt;MagicMock name=&#39;foo&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span>
<span class="go">&lt;MagicMock name=&#39;foo.method&#39; id=&#39;...&#39;&gt;</span>
</pre></div>
</div>
</div>
<div class="section" id="tracking-all-calls">
<h3>Tracking all Calls<a class="headerlink" href="#tracking-all-calls" title="Permalink to this headline"></a></h3>
<p>Often you want to track more than a single call to a method. The
<tt class="xref py py-attr docutils literal"><span class="pre">mock_calls</span></tt> attribute records all calls
to child attributes of the mock - and also to their children.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="go">&lt;MagicMock name=&#39;mock.method()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">attribute</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="n">x</span><span class="o">=</span><span class="mi">53</span><span class="p">)</span>
<span class="go">&lt;MagicMock name=&#39;mock.attribute.method()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[call.method(), call.attribute.method(10, x=53)]</span>
</pre></div>
</div>
<p>If you make an assertion about <cite>mock_calls</cite> and any unexpected methods
have been called, then the assertion will fail. This is useful because as well
as asserting that the calls you expected have been made, you are also checking
that they were made in the right order and with no additional calls:</p>
<p>You use the <tt class="xref py py-data docutils literal"><span class="pre">call</span></tt> object to construct lists for comparing with
<cite>mock_calls</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">expected</span> <span class="o">=</span> <span class="p">[</span><span class="n">call</span><span class="o">.</span><span class="n">method</span><span class="p">(),</span> <span class="n">call</span><span class="o">.</span><span class="n">attribute</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="n">x</span><span class="o">=</span><span class="mi">53</span><span class="p">)]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">mock_calls</span> <span class="o">==</span> <span class="n">expected</span>
<span class="go">True</span>
</pre></div>
</div>
</div>
<div class="section" id="setting-return-values-and-attributes">
<h3>Setting Return Values and Attributes<a class="headerlink" href="#setting-return-values-and-attributes" title="Permalink to this headline"></a></h3>
<p>Setting the return values on a mock object is trivially easy:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="mi">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="go">3</span>
</pre></div>
</div>
<p>Of course you can do the same for methods on the mock:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="mi">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="go">3</span>
</pre></div>
</div>
<p>The return value can also be set in the constructor:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="go">3</span>
</pre></div>
</div>
<p>If you need an attribute setting on your mock, just do it:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">x</span> <span class="o">=</span> <span class="mi">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">x</span>
<span class="go">3</span>
</pre></div>
</div>
<p>Sometimes you want to mock up a more complex situation, like for example
<cite>mock.connection.cursor().execute(&#8220;SELECT 1&#8221;)</cite>. If we wanted this call to
return a list, then we have to configure the result of the nested call.</p>
<p>We can use <tt class="xref py py-data docutils literal"><span class="pre">call</span></tt> to construct the set of calls in a &#8220;chained call&#8221; like
this for easy assertion afterwards:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">cursor</span> <span class="o">=</span> <span class="n">mock</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">cursor</span><span class="o">.</span><span class="n">return_value</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="p">[</span><span class="s">&#39;foo&#39;</span><span class="p">]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">cursor</span><span class="p">()</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s">&quot;SELECT 1&quot;</span><span class="p">)</span>
<span class="go">[&#39;foo&#39;]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">expected</span> <span class="o">=</span> <span class="n">call</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">cursor</span><span class="p">()</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s">&quot;SELECT 1&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">call_list</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[call.connection.cursor(), call.connection.cursor().execute(&#39;SELECT 1&#39;)]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">mock_calls</span> <span class="o">==</span> <span class="n">expected</span>
<span class="go">True</span>
</pre></div>
</div>
<p>It is the call to <cite>.call_list()</cite> that turns our call object into a list of
calls representing the chained calls.</p>
</div>
<div class="section" id="raising-exceptions-with-mocks">
<h3>Raising exceptions with mocks<a class="headerlink" href="#raising-exceptions-with-mocks" title="Permalink to this headline"></a></h3>
<p>A useful attribute is <tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt>. If you set this to an
exception class or instance then the exception will be raised when the mock
is called.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="ne">Exception</span><span class="p">(</span><span class="s">&#39;Boom!&#39;</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">Exception</span>: <span class="n">Boom!</span>
</pre></div>
</div>
</div>
<div class="section" id="side-effect-functions-and-iterables">
<h3>Side effect functions and iterables<a class="headerlink" href="#side-effect-functions-and-iterables" title="Permalink to this headline"></a></h3>
<p><cite>side_effect</cite> can also be set to a function or an iterable. The use case for
<cite>side_effect</cite> as an iterable is where your mock is going to be called several
times, and you want each call to return a different value. When you set
<cite>side_effect</cite> to an iterable every call to the mock returns the next value
from the iterable:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="p">[</span><span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">6</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="go">4</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="go">5</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="go">6</span>
</pre></div>
</div>
<p>For more advanced use cases, like dynamically varying the return values
depending on what the mock is called with, <cite>side_effect</cite> can be a function.
The function will be called with the same arguments as the mock. Whatever the
function returns is what the call returns:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">vals</span> <span class="o">=</span> <span class="p">{(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">):</span> <span class="mi">1</span><span class="p">,</span> <span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">):</span> <span class="mi">2</span><span class="p">}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">side_effect</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">vals</span><span class="p">[</span><span class="n">args</span><span class="p">]</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="n">side_effect</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="go">1</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="go">2</span>
</pre></div>
</div>
</div>
<div class="section" id="creating-a-mock-from-an-existing-object">
<h3>Creating a Mock from an Existing Object<a class="headerlink" href="#creating-a-mock-from-an-existing-object" title="Permalink to this headline"></a></h3>
<p>One problem with over use of mocking is that it couples your tests to the
implementation of your mocks rather than your real code. Suppose you have a
class that implements <cite>some_method</cite>. In a test for another class, you
provide a mock of this object that <em>also</em> provides <cite>some_method</cite>. If later
you refactor the first class, so that it no longer has <cite>some_method</cite> - then
your tests will continue to pass even though your code is now broken!</p>
<p><cite>Mock</cite> allows you to provide an object as a specification for the mock,
using the <cite>spec</cite> keyword argument. Accessing methods / attributes on the
mock that don&#8217;t exist on your specification object will immediately raise an
attribute error. If you change the implementation of your specification, then
tests that use that class will start failing immediately without you having to
instantiate the class in those tests.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">spec</span><span class="o">=</span><span class="n">SomeClass</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">old_method</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">AttributeError</span>: <span class="n">object has no attribute &#39;old_method&#39;</span>
</pre></div>
</div>
<p>If you want a stronger form of specification that prevents the setting
of arbitrary attributes as well as the getting of them then you can use
<cite>spec_set</cite> instead of <cite>spec</cite>.</p>
</div>
</div>
<div class="section" id="patch-decorators">
<h2>Patch Decorators<a class="headerlink" href="#patch-decorators" title="Permalink to this headline"></a></h2>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">With <cite>patch</cite> it matters that you patch objects in the namespace where they
are looked up. This is normally straightforward, but for a quick guide
read <a class="reference internal" href="patch.html#where-to-patch"><em>where to patch</em></a>.</p>
</div>
<p>A common need in tests is to patch a class attribute or a module attribute,
for example patching a builtin or patching a class in a module to test that it
is instantiated. Modules and classes are effectively global, so patching on
them has to be undone after the test or the patch will persist into other
tests and cause hard to diagnose problems.</p>
<p>mock provides three convenient decorators for this: <cite>patch</cite>, <cite>patch.object</cite> and
<cite>patch.dict</cite>. <cite>patch</cite> takes a single string, of the form
<cite>package.module.Class.attribute</cite> to specify the attribute you are patching. It
also optionally takes a value that you want the attribute (or class or
whatever) to be replaced with. &#8216;patch.object&#8217; takes an object and the name of
the attribute you would like patched, plus optionally the value to patch it
with.</p>
<p><cite>patch.object</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">original</span> <span class="o">=</span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">attribute</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch.object</span><span class="p">(</span><span class="n">SomeClass</span><span class="p">,</span> <span class="s">&#39;attribute&#39;</span><span class="p">,</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">attribute</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">attribute</span> <span class="o">==</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">attribute</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">attribute</span> <span class="o">==</span> <span class="n">original</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;package.module.attribute&#39;</span><span class="p">,</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">attribute</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
<span class="gp">... </span> <span class="kn">from</span> <span class="nn">package.module</span> <span class="kn">import</span> <span class="n">attribute</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">attribute</span> <span class="ow">is</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">attribute</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
</pre></div>
</div>
<p>If you are patching a module (including <cite>__builtin__</cite>) then use <cite>patch</cite>
instead of <cite>patch.object</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">return_value</span> <span class="o">=</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">file_handle</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;__builtin__.open&#39;</span><span class="p">,</span> <span class="n">mock</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">handle</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">&#39;filename&#39;</span><span class="p">,</span> <span class="s">&#39;r&#39;</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="s">&#39;filename&#39;</span><span class="p">,</span> <span class="s">&#39;r&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">handle</span> <span class="o">==</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">file_handle</span><span class="p">,</span> <span class="s">&quot;incorrect file handle returned&quot;</span>
</pre></div>
</div>
<p>The module name can be &#8216;dotted&#8217;, in the form <cite>package.module</cite> if needed:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;package.module.ClassName.attribute&#39;</span><span class="p">,</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">attribute</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
<span class="gp">... </span> <span class="kn">from</span> <span class="nn">package.module</span> <span class="kn">import</span> <span class="n">ClassName</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">ClassName</span><span class="o">.</span><span class="n">attribute</span> <span class="o">==</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">attribute</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
</pre></div>
</div>
<p>A nice pattern is to actually decorate test methods themselves:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">MyTest</span><span class="p">(</span><span class="n">unittest2</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
<span class="gp">... </span> <span class="nd">@patch.object</span><span class="p">(</span><span class="n">SomeClass</span><span class="p">,</span> <span class="s">&#39;attribute&#39;</span><span class="p">,</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">attribute</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">test_something</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="n">SomeClass</span><span class="o">.</span><span class="n">attribute</span><span class="p">,</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">attribute</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">original</span> <span class="o">=</span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">attribute</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MyTest</span><span class="p">(</span><span class="s">&#39;test_something&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">test_something</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">attribute</span> <span class="o">==</span> <span class="n">original</span>
</pre></div>
</div>
<p>If you want to patch with a Mock, you can use <cite>patch</cite> with only one argument
(or <cite>patch.object</cite> with two arguments). The mock will be created for you and
passed into the test function / method:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">MyTest</span><span class="p">(</span><span class="n">unittest2</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
<span class="gp">... </span> <span class="nd">@patch.object</span><span class="p">(</span><span class="n">SomeClass</span><span class="p">,</span> <span class="s">&#39;static_method&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">test_something</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">mock_method</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">static_method</span><span class="p">()</span>
<span class="gp">... </span> <span class="n">mock_method</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MyTest</span><span class="p">(</span><span class="s">&#39;test_something&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">test_something</span><span class="p">()</span>
</pre></div>
</div>
<p>You can stack up multiple patch decorators using this pattern:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">MyTest</span><span class="p">(</span><span class="n">unittest2</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
<span class="gp">... </span> <span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;package.module.ClassName1&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;package.module.ClassName2&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">test_something</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">MockClass2</span><span class="p">,</span> <span class="n">MockClass1</span><span class="p">):</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">assertTrue</span><span class="p">(</span><span class="n">package</span><span class="o">.</span><span class="n">module</span><span class="o">.</span><span class="n">ClassName1</span> <span class="ow">is</span> <span class="n">MockClass1</span><span class="p">)</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">assertTrue</span><span class="p">(</span><span class="n">package</span><span class="o">.</span><span class="n">module</span><span class="o">.</span><span class="n">ClassName2</span> <span class="ow">is</span> <span class="n">MockClass2</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MyTest</span><span class="p">(</span><span class="s">&#39;test_something&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">test_something</span><span class="p">()</span>
</pre></div>
</div>
<p>When you nest patch decorators the mocks are passed in to the decorated
function in the same order they applied (the normal <em>python</em> order that
decorators are applied). This means from the bottom up, so in the example
above the mock for <cite>test_module.ClassName2</cite> is passed in first.</p>
<p>There is also <tt class="xref py py-func docutils literal"><span class="pre">patch.dict()</span></tt> for setting values in a dictionary just
during a scope and restoring the dictionary to its original state when the test
ends:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">foo</span> <span class="o">=</span> <span class="p">{</span><span class="s">&#39;key&#39;</span><span class="p">:</span> <span class="s">&#39;value&#39;</span><span class="p">}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">original</span> <span class="o">=</span> <span class="n">foo</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">dict</span><span class="p">(</span><span class="n">foo</span><span class="p">,</span> <span class="p">{</span><span class="s">&#39;newkey&#39;</span><span class="p">:</span> <span class="s">&#39;newvalue&#39;</span><span class="p">},</span> <span class="n">clear</span><span class="o">=</span><span class="bp">True</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">foo</span> <span class="o">==</span> <span class="p">{</span><span class="s">&#39;newkey&#39;</span><span class="p">:</span> <span class="s">&#39;newvalue&#39;</span><span class="p">}</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">foo</span> <span class="o">==</span> <span class="n">original</span>
</pre></div>
</div>
<p><cite>patch</cite>, <cite>patch.object</cite> and <cite>patch.dict</cite> can all be used as context managers.</p>
<p>Where you use <cite>patch</cite> to create a mock for you, you can get a reference to the
mock using the &#8220;as&#8221; form of the with statement:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">ProductionClass</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">method</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">object</span><span class="p">(</span><span class="n">ProductionClass</span><span class="p">,</span> <span class="s">&#39;method&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">mock_method</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">mock_method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="bp">None</span>
<span class="gp">... </span> <span class="n">real</span> <span class="o">=</span> <span class="n">ProductionClass</span><span class="p">()</span>
<span class="gp">... </span> <span class="n">real</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_method</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
</pre></div>
</div>
<p>As an alternative <cite>patch</cite>, <cite>patch.object</cite> and <cite>patch.dict</cite> can be used as
class decorators. When used in this way it is the same as applying the
decorator indvidually to every method whose name starts with &#8220;test&#8221;.</p>
<p>For some more advanced examples, see the <a class="reference internal" href="examples.html#further-examples"><em>Further Examples</em></a> page.</p>
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<li><a class="reference internal" href="#mock-patching-methods">Mock Patching Methods</a></li>
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<h1>Mock - Mocking and Testing Library<a class="headerlink" href="#mock-mocking-and-testing-library" title="Permalink to this headline"></a></h1>
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<tr class="field-odd field"><th class="field-name">Author:</th><td class="field-body"><a class="reference external" href="http://www.voidspace.org.uk/python/weblog/index.shtml">Michael Foord</a></td>
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<span class="target" id="module-mock"></span><p id="index-0">mock is a library for testing in Python. It allows you to replace parts of
your system under test with mock objects and make assertions about how they
have been used.</p>
<p>mock is now part of the Python standard library, available as <a class="reference external" href="http://docs.python.org/py3k/library/unittest.mock.html#module-unittest.mock">unittest.mock</a>
in Python 3.3 onwards.</p>
<p>mock provides a core <a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt></a> class removing the need to create a host
of stubs throughout your test suite. After performing an action, you can make
assertions about which methods / attributes were used and arguments they were
called with. You can also specify return values and set needed attributes in
the normal way.</p>
<p>Additionally, mock provides a <a class="reference internal" href="patch.html#mock.patch" title="mock.patch"><tt class="xref py py-func docutils literal"><span class="pre">patch()</span></tt></a> decorator that handles patching
module and class level attributes within the scope of a test, along with
<a class="reference internal" href="sentinel.html#mock.sentinel" title="mock.sentinel"><tt class="xref py py-const docutils literal"><span class="pre">sentinel</span></tt></a> for creating unique objects. See the <a class="reference internal" href="#quick-guide">quick guide</a> for
some examples of how to use <a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt></a>, <a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a> and
<a class="reference internal" href="patch.html#mock.patch" title="mock.patch"><tt class="xref py py-func docutils literal"><span class="pre">patch()</span></tt></a>.</p>
<p>Mock is very easy to use and is designed for use with
<a class="reference external" href="http://pypi.python.org/pypi/unittest2">unittest</a>. Mock is based on
the &#8216;action -&gt; assertion&#8217; pattern instead of <cite>&#8216;record -&gt; replay&#8217;</cite> used by many
mocking frameworks.</p>
<p>mock is tested on Python versions 2.4-2.7, Python 3 plus the latest versions of
Jython and PyPy.</p>
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<li class="toctree-l2"><a class="reference internal" href="examples.html#multiple-calls-with-different-effects">Multiple calls with different effects</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#nesting-patches">Nesting Patches</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#mocking-a-dictionary-with-magicmock">Mocking a dictionary with MagicMock</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#mock-subclasses-and-their-attributes">Mock subclasses and their attributes</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#mocking-imports-with-patch-dict">Mocking imports with patch.dict</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#tracking-order-of-calls-and-less-verbose-call-assertions">Tracking order of calls and less verbose call assertions</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#more-complex-argument-matching">More complex argument matching</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#less-verbose-configuration-of-mock-objects">Less verbose configuration of mock objects</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#matching-any-argument-in-assertions">Matching any argument in assertions</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#mocking-properties">Mocking Properties</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#mocking-open">Mocking open</a></li>
<li class="toctree-l2"><a class="reference internal" href="examples.html#mocks-without-some-attributes">Mocks without some attributes</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="compare.html">Mock Library Comparison</a><ul>
<li class="toctree-l2"><a class="reference internal" href="compare.html#simple-fake-object">Simple fake object</a></li>
<li class="toctree-l2"><a class="reference internal" href="compare.html#simple-mock">Simple mock</a></li>
<li class="toctree-l2"><a class="reference internal" href="compare.html#creating-partial-mocks">Creating partial mocks</a></li>
<li class="toctree-l2"><a class="reference internal" href="compare.html#ensure-calls-are-made-in-specific-order">Ensure calls are made in specific order</a></li>
<li class="toctree-l2"><a class="reference internal" href="compare.html#raising-exceptions">Raising exceptions</a></li>
<li class="toctree-l2"><a class="reference internal" href="compare.html#override-new-instances-of-a-class">Override new instances of a class</a></li>
<li class="toctree-l2"><a class="reference internal" href="compare.html#call-the-same-method-multiple-times">Call the same method multiple times</a></li>
<li class="toctree-l2"><a class="reference internal" href="compare.html#mock-chained-methods">Mock chained methods</a></li>
<li class="toctree-l2"><a class="reference internal" href="compare.html#mocking-a-context-manager">Mocking a context manager</a></li>
<li class="toctree-l2"><a class="reference internal" href="compare.html#mocking-the-builtin-open-used-as-a-context-manager">Mocking the builtin open used as a context manager</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="changelog.html">CHANGELOG</a><ul>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-1-0-0">2012/10/07 Version 1.0.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-1-0-0-beta-1">2012/07/13 Version 1.0.0 beta 1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-1-0-0-alpha-2">2012/05/04 Version 1.0.0 alpha 2</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-1-0-0-alpha-1">2012/03/25 Version 1.0.0 alpha 1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-8-0">2012/02/13 Version 0.8.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-8-0-release-candidate-2">2012/01/10 Version 0.8.0 release candidate 2</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-8-0-release-candidate-1">2011/12/29 Version 0.8.0 release candidate 1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-8-0-beta-4">2011/10/09 Version 0.8.0 beta 4</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-8-0-beta-3">2011/08/15 Version 0.8.0 beta 3</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-8-0-beta-2">2011/08/05 Version 0.8.0 beta 2</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-8-0-beta-1">2011/07/25 Version 0.8.0 beta 1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-8-0-alpha-2">2011/07/16 Version 0.8.0 alpha 2</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-8-0-alpha-1">2011/06/14 Version 0.8.0 alpha 1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-7-2">2011/05/30 Version 0.7.2</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-7-1">2011/05/06 Version 0.7.1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-7-0">2011/03/05 Version 0.7.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-7-0-rc-1">2011/02/16 Version 0.7.0 RC 1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-7-0-beta-4">2010/11/12 Version 0.7.0 beta 4</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-7-0-beta-3">2010/09/18 Version 0.7.0 beta 3</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-7-0-beta-2">2010/06/23 Version 0.7.0 beta 2</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-7-0-beta-1">2010/06/22 Version 0.7.0 beta 1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-6-0">2009/08/22 Version 0.6.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-5-0">2009/04/17 Version 0.5.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-4-0">2008/10/12 Version 0.4.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-3-1">2007/12/03 Version 0.3.1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-3-0">2007/11/30 Version 0.3.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-2-1">2007/11/21 Version 0.2.1</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-2-0">2007/11/20 Version 0.2.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="changelog.html#version-0-1-0">2007/11/19 Version 0.1.0</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="changelog.html#todo-and-limitations">TODO and Limitations</a></li>
</ul>
</div>
</div>
<div class="section" id="installing">
<span id="index-1"></span><h2>Installing<a class="headerlink" href="#installing" title="Permalink to this headline"></a></h2>
<p>The current version is 1.0.0. Mock is stable and widely used. If you do
find any bugs, or have suggestions for improvements / extensions
then please contact us.</p>
<ul class="simple">
<li><a class="reference external" href="http://pypi.python.org/pypi/mock">mock on PyPI</a></li>
<li><a class="reference external" href="http://www.voidspace.org.uk/downloads/mock-1.0.0.pdf">mock documentation as PDF</a></li>
<li><a class="reference external" href="http://code.google.com/p/mock/">Google Code Home &amp; Mercurial Repository</a></li>
</ul>
<span class="target" id="index-2"></span><p id="index-3">You can checkout the latest development version from the Google Code Mercurial
repository with the following command:</p>
<blockquote>
<div><tt class="docutils literal"><span class="pre">hg</span> <span class="pre">clone</span> <span class="pre">https://mock.googlecode.com/hg/</span> <span class="pre">mock</span></tt></div></blockquote>
<span class="target" id="index-4"></span><span class="target" id="index-5"></span><p id="index-6">If you have pip, setuptools or distribute you can install mock with:</p>
<blockquote>
<div><div class="line-block">
<div class="line"><tt class="docutils literal"><span class="pre">easy_install</span> <span class="pre">-U</span> <span class="pre">mock</span></tt></div>
<div class="line"><tt class="docutils literal"><span class="pre">pip</span> <span class="pre">install</span> <span class="pre">-U</span> <span class="pre">mock</span></tt></div>
</div>
</div></blockquote>
<p>Alternatively you can download the mock distribution from PyPI and after
unpacking run:</p>
<blockquote>
<div><tt class="docutils literal"><span class="pre">python</span> <span class="pre">setup.py</span> <span class="pre">install</span></tt></div></blockquote>
</div>
<div class="section" id="quick-guide">
<h2>Quick Guide<a class="headerlink" href="#quick-guide" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt></a> and <a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a> objects create all attributes and
methods as you access them and store details of how they have been used. You
can configure them, to specify return values or limit what attributes are
available, and then make assertions about how they have been used:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">mock</span> <span class="kn">import</span> <span class="n">MagicMock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">thing</span> <span class="o">=</span> <span class="n">ProductionClass</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">thing</span><span class="o">.</span><span class="n">method</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">thing</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="n">key</span><span class="o">=</span><span class="s">&#39;value&#39;</span><span class="p">)</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">thing</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="n">key</span><span class="o">=</span><span class="s">&#39;value&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt> allows you to perform side effects, including raising an
exception when a mock is called:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="ne">KeyError</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">KeyError</span>: <span class="n">&#39;foo&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">values</span> <span class="o">=</span> <span class="p">{</span><span class="s">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s">&#39;c&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">side_effect</span><span class="p">(</span><span class="n">arg</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">values</span><span class="p">[</span><span class="n">arg</span><span class="p">]</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="n">side_effect</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="s">&#39;a&#39;</span><span class="p">),</span> <span class="n">mock</span><span class="p">(</span><span class="s">&#39;b&#39;</span><span class="p">),</span> <span class="n">mock</span><span class="p">(</span><span class="s">&#39;c&#39;</span><span class="p">)</span>
<span class="go">(1, 2, 3)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="p">[</span><span class="mi">5</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(),</span> <span class="n">mock</span><span class="p">(),</span> <span class="n">mock</span><span class="p">()</span>
<span class="go">(5, 4, 3)</span>
</pre></div>
</div>
<p>Mock has many other ways you can configure it and control its behaviour. For
example the <cite>spec</cite> argument configures the mock to take its specification
from another object. Attempting to access attributes or methods on the mock
that don&#8217;t exist on the spec will fail with an <cite>AttributeError</cite>.</p>
<p>The <a class="reference internal" href="patch.html#mock.patch" title="mock.patch"><tt class="xref py py-func docutils literal"><span class="pre">patch()</span></tt></a> decorator / context manager makes it easy to mock classes or
objects in a module under test. The object you specify will be replaced with a
mock (or other object) during the test and restored when the test ends:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">mock</span> <span class="kn">import</span> <span class="n">patch</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;module.ClassName2&#39;</span><span class="p">)</span>
<span class="gp">... </span><span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;module.ClassName1&#39;</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="n">MockClass1</span><span class="p">,</span> <span class="n">MockClass2</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">module</span><span class="o">.</span><span class="n">ClassName1</span><span class="p">()</span>
<span class="gp">... </span> <span class="n">module</span><span class="o">.</span><span class="n">ClassName2</span><span class="p">()</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">MockClass1</span> <span class="ow">is</span> <span class="n">module</span><span class="o">.</span><span class="n">ClassName1</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">MockClass2</span> <span class="ow">is</span> <span class="n">module</span><span class="o">.</span><span class="n">ClassName2</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">MockClass1</span><span class="o">.</span><span class="n">called</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">MockClass2</span><span class="o">.</span><span class="n">called</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>When you nest patch decorators the mocks are passed in to the decorated
function in the same order they applied (the normal <em>python</em> order that
decorators are applied). This means from the bottom up, so in the example
above the mock for <cite>module.ClassName1</cite> is passed in first.</p>
<p class="last">With <cite>patch</cite> it matters that you patch objects in the namespace where they
are looked up. This is normally straightforward, but for a quick guide
read <a class="reference internal" href="patch.html#where-to-patch"><em>where to patch</em></a>.</p>
</div>
<p>As well as a decorator <cite>patch</cite> can be used as a context manager in a with
statement:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">object</span><span class="p">(</span><span class="n">ProductionClass</span><span class="p">,</span> <span class="s">&#39;method&#39;</span><span class="p">,</span> <span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span> <span class="k">as</span> <span class="n">mock_method</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">thing</span> <span class="o">=</span> <span class="n">ProductionClass</span><span class="p">()</span>
<span class="gp">... </span> <span class="n">thing</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_method</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
</pre></div>
</div>
<p>There is also <a class="reference internal" href="patch.html#mock.patch.dict" title="mock.patch.dict"><tt class="xref py py-func docutils literal"><span class="pre">patch.dict()</span></tt></a> for setting values in a dictionary just
during a scope and restoring the dictionary to its original state when the test
ends:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">foo</span> <span class="o">=</span> <span class="p">{</span><span class="s">&#39;key&#39;</span><span class="p">:</span> <span class="s">&#39;value&#39;</span><span class="p">}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">original</span> <span class="o">=</span> <span class="n">foo</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">dict</span><span class="p">(</span><span class="n">foo</span><span class="p">,</span> <span class="p">{</span><span class="s">&#39;newkey&#39;</span><span class="p">:</span> <span class="s">&#39;newvalue&#39;</span><span class="p">},</span> <span class="n">clear</span><span class="o">=</span><span class="bp">True</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">foo</span> <span class="o">==</span> <span class="p">{</span><span class="s">&#39;newkey&#39;</span><span class="p">:</span> <span class="s">&#39;newvalue&#39;</span><span class="p">}</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">foo</span> <span class="o">==</span> <span class="n">original</span>
</pre></div>
</div>
<p>Mock supports the mocking of Python <a class="reference internal" href="magicmock.html#magic-methods"><em>magic methods</em></a>. The
easiest way of using magic methods is with the <a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a> class. It
allows you to do things like:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__str__</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;foobarbaz&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">str</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">&#39;foobarbaz&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__str__</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">()</span>
</pre></div>
</div>
<p>Mock allows you to assign functions (or other Mock instances) to magic methods
and they will be called appropriately. The <cite>MagicMock</cite> class is just a Mock
variant that has all of the magic methods pre-created for you (well, all the
useful ones anyway).</p>
<p>The following is an example of using magic methods with the ordinary Mock
class:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__str__</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="s">&#39;wheeeeee&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">str</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">&#39;wheeeeee&#39;</span>
</pre></div>
</div>
<p>For ensuring that the mock objects in your tests have the same api as the
objects they are replacing, you can use <a class="reference internal" href="helpers.html#auto-speccing"><em>auto-speccing</em></a>.
Auto-speccing can be done through the <cite>autospec</cite> argument to patch, or the
<a class="reference internal" href="helpers.html#mock.create_autospec" title="mock.create_autospec"><tt class="xref py py-func docutils literal"><span class="pre">create_autospec()</span></tt></a> function. Auto-speccing creates mock objects that
have the same attributes and methods as the objects they are replacing, and
any functions and methods (including constructors) have the same call
signature as the real object.</p>
<p>This ensures that your mocks will fail in the same way as your production
code if they are used incorrectly:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">mock</span> <span class="kn">import</span> <span class="n">create_autospec</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">function</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_function</span> <span class="o">=</span> <span class="n">create_autospec</span><span class="p">(</span><span class="n">function</span><span class="p">,</span> <span class="n">return_value</span><span class="o">=</span><span class="s">&#39;fishy&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_function</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="go">&#39;fishy&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_function</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_function</span><span class="p">(</span><span class="s">&#39;wrong arguments&#39;</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">TypeError</span>: <span class="n">&lt;lambda&gt;() takes exactly 3 arguments (1 given)</span>
</pre></div>
</div>
<p><cite>create_autospec</cite> can also be used on classes, where it copies the signature of
the <cite>__init__</cite> method, and on callable objects where it copies the signature of
the <cite>__call__</cite> method.</p>
<span class="target" id="index-7"></span></div>
<div class="section" id="references">
<span id="index-8"></span><h2>References<a class="headerlink" href="#references" title="Permalink to this headline"></a></h2>
<p>Articles, blog entries and other stuff related to testing with Mock:</p>
<ul class="simple">
<li><a class="reference external" href="https://github.com/carljm/django-testing-slides/blob/master/models/30_no_database.md">Imposing a No DB Discipline on Django unit tests</a></li>
<li><a class="reference external" href="https://github.com/dcramer/mock-django">mock-django: tools for mocking the Django ORM and models</a></li>
<li><a class="reference external" href="https://blip.tv/file/4881513">PyCon 2011 Video: Testing with mock</a></li>
<li><a class="reference external" href="http://noopenblockers.com/2012/01/06/mock-objects-in-python/">Mock objects in Python</a></li>
<li><a class="reference external" href="http://blueprintforge.com/blog/2012/01/08/python-injecting-mock-objects-for-powerful-testing/">Python: Injecting Mock Objects for Powerful Testing</a></li>
<li><a class="reference external" href="http://www.michaelpollmeier.com/python-mock-how-to-assert-a-substring-of-logger-output/">Python Mock: How to assert a substring of logger output</a></li>
<li><a class="reference external" href="http://www.mattjmorrison.com/2011/09/mocking-django.html">Mocking Django</a></li>
<li><a class="reference external" href="http://williamjohnbert.com/2011/07/how-to-unit-testing-in-django-with-mocking-and-patching/">Mocking dates and other classes that can&#8217;t be modified</a></li>
<li><a class="reference external" href="http://konryd.blogspot.com/2010/06/mock-recipies.html">Mock recipes</a></li>
<li><a class="reference external" href="http://konryd.blogspot.com/2010/05/mockity-mock-mock-some-love-for-mock.html">Mockity mock mock - some love for the mock module</a></li>
<li><a class="reference external" href="http://mattsnider.com/python/mock-and-coverage/">Coverage and Mock (with django)</a></li>
<li><a class="reference external" href="http://www.insomnihack.com/?p=194">Python Unit Testing with Mock</a></li>
<li><a class="reference external" href="http://myadventuresincoding.wordpress.com/2011/02/26/python-python-mock-cheat-sheet/">Getting started with Python Mock</a></li>
<li><a class="reference external" href="http://tobyho.com/2011/03/24/smart-parameter-checks-in/">Smart Parameter Checks with mock</a></li>
<li><a class="reference external" href="http://agiletesting.blogspot.com/2009/07/python-mock-testing-techniques-and.html">Python mock testing techniques and tools</a></li>
<li><a class="reference external" href="http://techblog.ironfroggy.com/2008/10/how-to-test.html">How To Test Django Template Tags</a></li>
<li><a class="reference external" href="http://pypap.blogspot.com/2008/10/newbie-nugget-unit-testing-with-mock.html">A presentation on Unit Testing with Mock</a></li>
<li><a class="reference external" href="http://michael-a-nelson.blogspot.com/2008/09/mocking-with-django-and-google-app.html">Mocking with Django and Google AppEngine</a></li>
</ul>
<span class="target" id="index-9"></span></div>
<div class="section" id="tests">
<span id="index-10"></span><h2>Tests<a class="headerlink" href="#tests" title="Permalink to this headline"></a></h2>
<p>Mock uses <a class="reference external" href="http://pypi.python.org/pypi/unittest2">unittest2</a> for its own
test suite. In order to run it, use the <cite>unit2</cite> script that comes with
<cite>unittest2</cite> module on a checkout of the source repository:</p>
<blockquote>
<div><cite>unit2 discover</cite></div></blockquote>
<p>If you have <a class="reference external" href="http://pypi.python.org/pypi/distribute">setuptools</a> as well as
unittest2 you can run:</p>
<blockquote>
<div><tt class="docutils literal"><span class="pre">python</span> <span class="pre">setup.py</span> <span class="pre">test</span></tt></div></blockquote>
<p>On Python 3.2 you can use <tt class="docutils literal"><span class="pre">unittest</span></tt> module from the standard library.</p>
<blockquote>
<div><tt class="docutils literal"><span class="pre">python3.2</span> <span class="pre">-m</span> <span class="pre">unittest</span> <span class="pre">discover</span></tt></div></blockquote>
<p id="index-11">On Python 3 the tests for unicode are skipped as they are not relevant. On
Python 2.4 tests that use the with statements are skipped as the with statement
is invalid syntax on Python 2.4.</p>
</div>
<div class="section" id="older-versions">
<span id="index-12"></span><h2>Older Versions<a class="headerlink" href="#older-versions" title="Permalink to this headline"></a></h2>
<p>Documentation for older versions of mock:</p>
<ul class="simple">
<li><a class="reference external" href="http://www.voidspace.org.uk/python/mock/0.8/">mock 0.8</a></li>
<li><a class="reference external" href="http://www.voidspace.org.uk/python/mock/0.7/">mock 0.7</a></li>
<li><a class="reference external" href="http://www.voidspace.org.uk/python/mock/0.6.0/">mock 0.6</a></li>
</ul>
<p>Docs from the in-development version of <cite>mock</cite> can be found at
<a class="reference external" href="http://mock.readthedocs.org">mock.readthedocs.org</a>.</p>
</div>
<div class="section" id="terminology">
<h2>Terminology<a class="headerlink" href="#terminology" title="Permalink to this headline"></a></h2>
<p>Terminology for objects used to replace other ones can be confusing. Terms
like double, fake, mock, stub, and spy are all used with varying meanings.</p>
<p>In <a class="reference external" href="http://xunitpatterns.com/Mocks,%20Fakes,%20Stubs%20and%20Dummies.html">classic mock terminology</a>
<a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">mock.Mock</span></tt></a> is a <a class="reference external" href="http://xunitpatterns.com/Test%20Spy.html">spy</a> that
allows for <em>post-mortem</em> examination. This is what I call the &#8220;action -&gt;
assertion&#8221; <a class="footnote-reference" href="#id2" id="id1">[1]</a> pattern of testing.</p>
<p>I&#8217;m not however a fan of this &#8220;statically typed mocking terminology&#8221;
promulgated by <a class="reference external" href="http://martinfowler.com/articles/mocksArentStubs.html">Martin Fowler</a>. It confuses usage
patterns with implementation and prevents you from using natural terminology
when discussing mocking.</p>
<p>I much prefer duck typing, if an object used in your test suite looks like a
mock object and quacks like a mock object then it&#8217;s fine to call it a mock, no
matter what the implementation looks like.</p>
<p>This terminology is perhaps more useful in less capable languages where
different usage patterns will <em>require</em> different implementations.
<cite>mock.Mock()</cite> is capable of being used in most of the different roles
described by Fowler, except (annoyingly / frustratingly / ironically) a Mock
itself!</p>
<p>How about a simpler definition: a &#8220;mock object&#8221; is an object used to replace a
real one in a system under test.</p>
<table class="docutils footnote" frame="void" id="id2" rules="none">
<colgroup><col class="label" /><col /></colgroup>
<tbody valign="top">
<tr><td class="label"><a class="fn-backref" href="#id1">[1]</a></td><td>This pattern is called &#8220;AAA&#8221; by some members of the testing community;
&#8220;Arrange - Act - Assert&#8221;.</td></tr>
</tbody>
</table>
</div>
</div>
</div>
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<li><a class="reference internal" href="#">Mock - Mocking and Testing Library</a><ul>
<li><a class="reference internal" href="#api-documentation">API Documentation</a><ul>
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<li><a class="reference internal" href="#user-guide">User Guide</a><ul>
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<li><a class="reference internal" href="#references">References</a></li>
<li><a class="reference internal" href="#tests">Tests</a></li>
<li><a class="reference internal" href="#older-versions">Older Versions</a></li>
<li><a class="reference internal" href="#terminology">Terminology</a></li>
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<div class="section" id="mocking-magic-methods">
<span id="magic-methods"></span><h1>Mocking Magic Methods<a class="headerlink" href="#mocking-magic-methods" title="Permalink to this headline"></a></h1>
<p><a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt></a> supports mocking <a class="reference external" href="http://www.ironpythoninaction.com/magic-methods.html">magic methods</a>. This allows mock
objects to replace containers or other objects that implement Python
protocols.</p>
<p>Because magic methods are looked up differently from normal methods <a class="footnote-reference" href="#id4" id="id2">[1]</a>, this
support has been specially implemented. This means that only specific magic
methods are supported. The supported list includes <em>almost</em> all of them. If
there are any missing that you need please let us know!</p>
<p>You mock magic methods by setting the method you are interested in to a function
or a mock instance. If you are using a function then it <em>must</em> take <tt class="docutils literal"><span class="pre">self</span></tt> as
the first argument <a class="footnote-reference" href="#id5" id="id3">[2]</a>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="s">&#39;fooble&#39;</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__str__</span> <span class="o">=</span> <span class="n">__str__</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">str</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">&#39;fooble&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__str__</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__str__</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;fooble&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">str</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">&#39;fooble&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__iter__</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="nb">iter</span><span class="p">([]))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">list</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">[]</span>
</pre></div>
</div>
<p>One use case for this is for mocking objects used as context managers in a
<cite>with</cite> statement:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__enter__</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="s">&#39;foo&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__exit__</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">mock</span> <span class="k">as</span> <span class="n">m</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">m</span> <span class="o">==</span> <span class="s">&#39;foo&#39;</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__enter__</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__exit__</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span>
</pre></div>
</div>
<p>Calls to magic methods do not appear in <a class="reference internal" href="mock.html#mock.Mock.method_calls" title="mock.Mock.method_calls"><tt class="xref py py-attr docutils literal"><span class="pre">method_calls</span></tt></a>, but they
are recorded in <a class="reference internal" href="mock.html#mock.Mock.mock_calls" title="mock.Mock.mock_calls"><tt class="xref py py-attr docutils literal"><span class="pre">mock_calls</span></tt></a>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If you use the <cite>spec</cite> keyword argument to create a mock then attempting to
set a magic method that isn&#8217;t in the spec will raise an <cite>AttributeError</cite>.</p>
</div>
<p>The full list of supported magic methods is:</p>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">__hash__</span></tt>, <tt class="docutils literal"><span class="pre">__sizeof__</span></tt>, <tt class="docutils literal"><span class="pre">__repr__</span></tt> and <tt class="docutils literal"><span class="pre">__str__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__dir__</span></tt>, <tt class="docutils literal"><span class="pre">__format__</span></tt> and <tt class="docutils literal"><span class="pre">__subclasses__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__floor__</span></tt>, <tt class="docutils literal"><span class="pre">__trunc__</span></tt> and <tt class="docutils literal"><span class="pre">__ceil__</span></tt></li>
<li>Comparisons: <tt class="docutils literal"><span class="pre">__cmp__</span></tt>, <tt class="docutils literal"><span class="pre">__lt__</span></tt>, <tt class="docutils literal"><span class="pre">__gt__</span></tt>, <tt class="docutils literal"><span class="pre">__le__</span></tt>, <tt class="docutils literal"><span class="pre">__ge__</span></tt>,
<tt class="docutils literal"><span class="pre">__eq__</span></tt> and <tt class="docutils literal"><span class="pre">__ne__</span></tt></li>
<li>Container methods: <tt class="docutils literal"><span class="pre">__getitem__</span></tt>, <tt class="docutils literal"><span class="pre">__setitem__</span></tt>, <tt class="docutils literal"><span class="pre">__delitem__</span></tt>,
<tt class="docutils literal"><span class="pre">__contains__</span></tt>, <tt class="docutils literal"><span class="pre">__len__</span></tt>, <tt class="docutils literal"><span class="pre">__iter__</span></tt>, <tt class="docutils literal"><span class="pre">__getslice__</span></tt>,
<tt class="docutils literal"><span class="pre">__setslice__</span></tt>, <tt class="docutils literal"><span class="pre">__reversed__</span></tt> and <tt class="docutils literal"><span class="pre">__missing__</span></tt></li>
<li>Context manager: <tt class="docutils literal"><span class="pre">__enter__</span></tt> and <tt class="docutils literal"><span class="pre">__exit__</span></tt></li>
<li>Unary numeric methods: <tt class="docutils literal"><span class="pre">__neg__</span></tt>, <tt class="docutils literal"><span class="pre">__pos__</span></tt> and <tt class="docutils literal"><span class="pre">__invert__</span></tt></li>
<li>The numeric methods (including right hand and in-place variants):
<tt class="docutils literal"><span class="pre">__add__</span></tt>, <tt class="docutils literal"><span class="pre">__sub__</span></tt>, <tt class="docutils literal"><span class="pre">__mul__</span></tt>, <tt class="docutils literal"><span class="pre">__div__</span></tt>,
<tt class="docutils literal"><span class="pre">__floordiv__</span></tt>, <tt class="docutils literal"><span class="pre">__mod__</span></tt>, <tt class="docutils literal"><span class="pre">__divmod__</span></tt>, <tt class="docutils literal"><span class="pre">__lshift__</span></tt>,
<tt class="docutils literal"><span class="pre">__rshift__</span></tt>, <tt class="docutils literal"><span class="pre">__and__</span></tt>, <tt class="docutils literal"><span class="pre">__xor__</span></tt>, <tt class="docutils literal"><span class="pre">__or__</span></tt>, and <tt class="docutils literal"><span class="pre">__pow__</span></tt></li>
<li>Numeric conversion methods: <tt class="docutils literal"><span class="pre">__complex__</span></tt>, <tt class="docutils literal"><span class="pre">__int__</span></tt>, <tt class="docutils literal"><span class="pre">__float__</span></tt>,
<tt class="docutils literal"><span class="pre">__index__</span></tt> and <tt class="docutils literal"><span class="pre">__coerce__</span></tt></li>
<li>Descriptor methods: <tt class="docutils literal"><span class="pre">__get__</span></tt>, <tt class="docutils literal"><span class="pre">__set__</span></tt> and <tt class="docutils literal"><span class="pre">__delete__</span></tt></li>
<li>Pickling: <tt class="docutils literal"><span class="pre">__reduce__</span></tt>, <tt class="docutils literal"><span class="pre">__reduce_ex__</span></tt>, <tt class="docutils literal"><span class="pre">__getinitargs__</span></tt>,
<tt class="docutils literal"><span class="pre">__getnewargs__</span></tt>, <tt class="docutils literal"><span class="pre">__getstate__</span></tt> and <tt class="docutils literal"><span class="pre">__setstate__</span></tt></li>
</ul>
<p>The following methods are supported in Python 2 but don&#8217;t exist in Python 3:</p>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">__unicode__</span></tt>, <tt class="docutils literal"><span class="pre">__long__</span></tt>, <tt class="docutils literal"><span class="pre">__oct__</span></tt>, <tt class="docutils literal"><span class="pre">__hex__</span></tt> and <tt class="docutils literal"><span class="pre">__nonzero__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__truediv__</span></tt> and <tt class="docutils literal"><span class="pre">__rtruediv__</span></tt></li>
</ul>
<p>The following methods are supported in Python 3 but don&#8217;t exist in Python 2:</p>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">__bool__</span></tt> and <tt class="docutils literal"><span class="pre">__next__</span></tt></li>
</ul>
<p>The following methods exist but are <em>not</em> supported as they are either in use by
mock, can&#8217;t be set dynamically, or can cause problems:</p>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">__getattr__</span></tt>, <tt class="docutils literal"><span class="pre">__setattr__</span></tt>, <tt class="docutils literal"><span class="pre">__init__</span></tt> and <tt class="docutils literal"><span class="pre">__new__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__prepare__</span></tt>, <tt class="docutils literal"><span class="pre">__instancecheck__</span></tt>, <tt class="docutils literal"><span class="pre">__subclasscheck__</span></tt>, <tt class="docutils literal"><span class="pre">__del__</span></tt></li>
</ul>
</div>
<div class="section" id="magic-mock">
<h1>Magic Mock<a class="headerlink" href="#magic-mock" title="Permalink to this headline"></a></h1>
<p>There are two <cite>MagicMock</cite> variants: <cite>MagicMock</cite> and <cite>NonCallableMagicMock</cite>.</p>
<dl class="class">
<dt id="mock.MagicMock">
<em class="property">class </em><tt class="descname">MagicMock</tt><big>(</big><em>*args</em>, <em>**kw</em><big>)</big><a class="headerlink" href="#mock.MagicMock" title="Permalink to this definition"></a></dt>
<dd><p><tt class="docutils literal"><span class="pre">MagicMock</span></tt> is a subclass of <a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt></a> with default implementations
of most of the magic methods. You can use <tt class="docutils literal"><span class="pre">MagicMock</span></tt> without having to
configure the magic methods yourself.</p>
<p>The constructor parameters have the same meaning as for <a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt></a>.</p>
<p>If you use the <cite>spec</cite> or <cite>spec_set</cite> arguments then <em>only</em> magic methods
that exist in the spec will be created.</p>
</dd></dl>
<dl class="class">
<dt id="mock.NonCallableMagicMock">
<em class="property">class </em><tt class="descname">NonCallableMagicMock</tt><big>(</big><em>*args</em>, <em>**kw</em><big>)</big><a class="headerlink" href="#mock.NonCallableMagicMock" title="Permalink to this definition"></a></dt>
<dd><p>A non-callable version of <cite>MagicMock</cite>.</p>
<p>The constructor parameters have the same meaning as for
<a class="reference internal" href="#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a>, with the exception of <cite>return_value</cite> and
<cite>side_effect</cite> which have no meaning on a non-callable mock.</p>
</dd></dl>
<p>The magic methods are setup with <cite>MagicMock</cite> objects, so you can configure them
and use them in the usual way:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span> <span class="o">=</span> <span class="s">&#39;fish&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__setitem__</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="s">&#39;fish&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__getitem__</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;result&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span>
<span class="go">&#39;result&#39;</span>
</pre></div>
</div>
<p>By default many of the protocol methods are required to return objects of a
specific type. These methods are preconfigured with a default return value, so
that they can be used without you having to do anything if you aren&#8217;t interested
in the return value. You can still <em>set</em> the return value manually if you want
to change the default.</p>
<p>Methods and their defaults:</p>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">__lt__</span></tt>: NotImplemented</li>
<li><tt class="docutils literal"><span class="pre">__gt__</span></tt>: NotImplemented</li>
<li><tt class="docutils literal"><span class="pre">__le__</span></tt>: NotImplemented</li>
<li><tt class="docutils literal"><span class="pre">__ge__</span></tt>: NotImplemented</li>
<li><tt class="docutils literal"><span class="pre">__int__</span></tt> : 1</li>
<li><tt class="docutils literal"><span class="pre">__contains__</span></tt> : False</li>
<li><tt class="docutils literal"><span class="pre">__len__</span></tt> : 1</li>
<li><tt class="docutils literal"><span class="pre">__iter__</span></tt> : iter([])</li>
<li><tt class="docutils literal"><span class="pre">__exit__</span></tt> : False</li>
<li><tt class="docutils literal"><span class="pre">__complex__</span></tt> : 1j</li>
<li><tt class="docutils literal"><span class="pre">__float__</span></tt> : 1.0</li>
<li><tt class="docutils literal"><span class="pre">__bool__</span></tt> : True</li>
<li><tt class="docutils literal"><span class="pre">__nonzero__</span></tt> : True</li>
<li><tt class="docutils literal"><span class="pre">__oct__</span></tt> : &#8216;1&#8217;</li>
<li><tt class="docutils literal"><span class="pre">__hex__</span></tt> : &#8216;0x1&#8217;</li>
<li><tt class="docutils literal"><span class="pre">__long__</span></tt> : long(1)</li>
<li><tt class="docutils literal"><span class="pre">__index__</span></tt> : 1</li>
<li><tt class="docutils literal"><span class="pre">__hash__</span></tt> : default hash for the mock</li>
<li><tt class="docutils literal"><span class="pre">__str__</span></tt> : default str for the mock</li>
<li><tt class="docutils literal"><span class="pre">__unicode__</span></tt> : default unicode for the mock</li>
<li><tt class="docutils literal"><span class="pre">__sizeof__</span></tt>: default sizeof for the mock</li>
</ul>
<p>For example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">int</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">1</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">len</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">0</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">hex</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">&#39;0x1&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">list</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">[]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">object</span><span class="p">()</span> <span class="ow">in</span> <span class="n">mock</span>
<span class="go">False</span>
</pre></div>
</div>
<p>The two equality method, <cite>__eq__</cite> and <cite>__ne__</cite>, are special (changed in
0.7.2). They do the default equality comparison on identity, using a side
effect, unless you change their return value to return something else:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">MagicMock</span><span class="p">()</span> <span class="o">==</span> <span class="mi">3</span>
<span class="go">False</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MagicMock</span><span class="p">()</span> <span class="o">!=</span> <span class="mi">3</span>
<span class="go">True</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__eq__</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="bp">True</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">==</span> <span class="mi">3</span>
<span class="go">True</span>
</pre></div>
</div>
<p>In <cite>0.8</cite> the <cite>__iter__</cite> also gained special handling implemented with a
side effect. The return value of <cite>MagicMock.__iter__</cite> can be any iterable
object and isn&#8217;t required to be an iterator:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__iter__</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="p">[</span><span class="s">&#39;a&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">,</span> <span class="s">&#39;c&#39;</span><span class="p">]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">list</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">[&#39;a&#39;, &#39;b&#39;, &#39;c&#39;]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">list</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">[&#39;a&#39;, &#39;b&#39;, &#39;c&#39;]</span>
</pre></div>
</div>
<p>If the return value <em>is</em> an iterator, then iterating over it once will consume
it and subsequent iterations will result in an empty list:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__iter__</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="nb">iter</span><span class="p">([</span><span class="s">&#39;a&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">,</span> <span class="s">&#39;c&#39;</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">list</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">[&#39;a&#39;, &#39;b&#39;, &#39;c&#39;]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">list</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">[]</span>
</pre></div>
</div>
<p><tt class="docutils literal"><span class="pre">MagicMock</span></tt> has all of the supported magic methods configured except for some
of the obscure and obsolete ones. You can still set these up if you want.</p>
<p>Magic methods that are supported but not setup by default in <tt class="docutils literal"><span class="pre">MagicMock</span></tt> are:</p>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">__cmp__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__getslice__</span></tt> and <tt class="docutils literal"><span class="pre">__setslice__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__coerce__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__subclasses__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__dir__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__format__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__get__</span></tt>, <tt class="docutils literal"><span class="pre">__set__</span></tt> and <tt class="docutils literal"><span class="pre">__delete__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__reversed__</span></tt> and <tt class="docutils literal"><span class="pre">__missing__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__reduce__</span></tt>, <tt class="docutils literal"><span class="pre">__reduce_ex__</span></tt>, <tt class="docutils literal"><span class="pre">__getinitargs__</span></tt>, <tt class="docutils literal"><span class="pre">__getnewargs__</span></tt>,
<tt class="docutils literal"><span class="pre">__getstate__</span></tt> and <tt class="docutils literal"><span class="pre">__setstate__</span></tt></li>
<li><tt class="docutils literal"><span class="pre">__getformat__</span></tt> and <tt class="docutils literal"><span class="pre">__setformat__</span></tt></li>
</ul>
<hr class="docutils" />
<table class="docutils footnote" frame="void" id="id4" rules="none">
<colgroup><col class="label" /><col /></colgroup>
<tbody valign="top">
<tr><td class="label"><a class="fn-backref" href="#id2">[1]</a></td><td>Magic methods <em>should</em> be looked up on the class rather than the
instance. Different versions of Python are inconsistent about applying this
rule. The supported protocol methods should work with all supported versions
of Python.</td></tr>
</tbody>
</table>
<table class="docutils footnote" frame="void" id="id5" rules="none">
<colgroup><col class="label" /><col /></colgroup>
<tbody valign="top">
<tr><td class="label"><a class="fn-backref" href="#id3">[2]</a></td><td>The function is basically hooked up to the class, but each <tt class="docutils literal"><span class="pre">Mock</span></tt>
instance is kept isolated from the others.</td></tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
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<div class="section" id="the-mock-class">
<h1>The Mock Class<a class="headerlink" href="#the-mock-class" title="Permalink to this headline"></a></h1>
<p><cite>Mock</cite> is a flexible mock object intended to replace the use of stubs and
test doubles throughout your code. Mocks are callable and create attributes as
new mocks when you access them <a class="footnote-reference" href="#id3" id="id1">[1]</a>. Accessing the same attribute will always
return the same mock. Mocks record how you use them, allowing you to make
assertions about what your code has done to them.</p>
<p><a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a> is a subclass of <cite>Mock</cite> with all the magic methods
pre-created and ready to use. There are also non-callable variants, useful
when you are mocking out objects that aren&#8217;t callable:
<a class="reference internal" href="#mock.NonCallableMock" title="mock.NonCallableMock"><tt class="xref py py-class docutils literal"><span class="pre">NonCallableMock</span></tt></a> and <a class="reference internal" href="magicmock.html#mock.NonCallableMagicMock" title="mock.NonCallableMagicMock"><tt class="xref py py-class docutils literal"><span class="pre">NonCallableMagicMock</span></tt></a></p>
<p>The <a class="reference internal" href="patch.html#mock.patch" title="mock.patch"><tt class="xref py py-func docutils literal"><span class="pre">patch()</span></tt></a> decorators makes it easy to temporarily replace classes
in a particular module with a <cite>Mock</cite> object. By default <cite>patch</cite> will create
a <cite>MagicMock</cite> for you. You can specify an alternative class of <cite>Mock</cite> using
the <cite>new_callable</cite> argument to <cite>patch</cite>.</p>
<span class="target" id="index-0"></span><span class="target" id="index-1"></span><span class="target" id="index-2"></span><span class="target" id="index-3"></span><span class="target" id="index-4"></span><dl class="class">
<dt id="mock.Mock">
<em class="property">class </em><tt class="descname">Mock</tt><big>(</big><em>spec=None</em>, <em>side_effect=None</em>, <em>return_value=DEFAULT</em>, <em>wraps=None</em>, <em>name=None</em>, <em>spec_set=None</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.Mock" title="Permalink to this definition"></a></dt>
<dd><p>Create a new <cite>Mock</cite> object. <cite>Mock</cite> takes several optional arguments
that specify the behaviour of the Mock object:</p>
<ul>
<li><p class="first"><cite>spec</cite>: This can be either a list of strings or an existing object (a
class or instance) that acts as the specification for the mock object. If
you pass in an object then a list of strings is formed by calling dir on
the object (excluding unsupported magic attributes and methods).
Accessing any attribute not in this list will raise an <cite>AttributeError</cite>.</p>
<p>If <cite>spec</cite> is an object (rather than a list of strings) then
<a class="reference internal" href="#mock.Mock.__class__" title="mock.Mock.__class__"><tt class="xref py py-attr docutils literal"><span class="pre">__class__</span></tt></a> returns the class of the spec object. This allows mocks
to pass <cite>isinstance</cite> tests.</p>
</li>
<li><p class="first"><cite>spec_set</cite>: A stricter variant of <cite>spec</cite>. If used, attempting to <em>set</em>
or get an attribute on the mock that isn&#8217;t on the object passed as
<cite>spec_set</cite> will raise an <cite>AttributeError</cite>.</p>
</li>
<li><p class="first"><cite>side_effect</cite>: A function to be called whenever the Mock is called. See
the <a class="reference internal" href="#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a> attribute. Useful for raising exceptions or
dynamically changing return values. The function is called with the same
arguments as the mock, and unless it returns <a class="reference internal" href="sentinel.html#mock.DEFAULT" title="mock.DEFAULT"><tt class="xref py py-data docutils literal"><span class="pre">DEFAULT</span></tt></a>, the return
value of this function is used as the return value.</p>
<p>Alternatively <cite>side_effect</cite> can be an exception class or instance. In
this case the exception will be raised when the mock is called.</p>
<p>If <cite>side_effect</cite> is an iterable then each call to the mock will return
the next value from the iterable. If any of the members of the iterable
are exceptions they will be raised instead of returned.</p>
<p>A <cite>side_effect</cite> can be cleared by setting it to <cite>None</cite>.</p>
</li>
<li><p class="first"><cite>return_value</cite>: The value returned when the mock is called. By default
this is a new Mock (created on first access). See the
<a class="reference internal" href="#mock.Mock.return_value" title="mock.Mock.return_value"><tt class="xref py py-attr docutils literal"><span class="pre">return_value</span></tt></a> attribute.</p>
</li>
<li><p class="first"><cite>wraps</cite>: Item for the mock object to wrap. If <cite>wraps</cite> is not None then
calling the Mock will pass the call through to the wrapped object
(returning the real result and ignoring <cite>return_value</cite>). Attribute access
on the mock will return a Mock object that wraps the corresponding
attribute of the wrapped object (so attempting to access an attribute
that doesn&#8217;t exist will raise an <cite>AttributeError</cite>).</p>
<p>If the mock has an explicit <cite>return_value</cite> set then calls are not passed
to the wrapped object and the <cite>return_value</cite> is returned instead.</p>
</li>
<li><p class="first"><cite>name</cite>: If the mock has a name then it will be used in the repr of the
mock. This can be useful for debugging. The name is propagated to child
mocks.</p>
</li>
</ul>
<p>Mocks can also be called with arbitrary keyword arguments. These will be
used to set attributes on the mock after it is created. See the
<a class="reference internal" href="#mock.Mock.configure_mock" title="mock.Mock.configure_mock"><tt class="xref py py-meth docutils literal"><span class="pre">configure_mock()</span></tt></a> method for details.</p>
<dl class="method">
<dt id="mock.Mock.assert_called_with">
<tt class="descname">assert_called_with</tt><big>(</big><em>*args</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.Mock.assert_called_with" title="Permalink to this definition"></a></dt>
<dd><p>This method is a convenient way of asserting that calls are made in a
particular way:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="n">test</span><span class="o">=</span><span class="s">&#39;wow&#39;</span><span class="p">)</span>
<span class="go">&lt;Mock name=&#39;mock.method()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="n">test</span><span class="o">=</span><span class="s">&#39;wow&#39;</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="mock.Mock.assert_called_once_with">
<tt class="descname">assert_called_once_with</tt><big>(</big><em>*args</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.Mock.assert_called_once_with" title="Permalink to this definition"></a></dt>
<dd><p>Assert that the mock was called exactly once and with the specified
arguments.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">,</span> <span class="n">bar</span><span class="o">=</span><span class="s">&#39;baz&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">,</span> <span class="n">bar</span><span class="o">=</span><span class="s">&#39;baz&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">,</span> <span class="n">bar</span><span class="o">=</span><span class="s">&#39;baz&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">,</span> <span class="n">bar</span><span class="o">=</span><span class="s">&#39;baz&#39;</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">AssertionError</span>: <span class="n">Expected to be called once. Called 2 times.</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="mock.Mock.assert_any_call">
<tt class="descname">assert_any_call</tt><big>(</big><em>*args</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.Mock.assert_any_call" title="Permalink to this definition"></a></dt>
<dd><p>assert the mock has been called with the specified arguments.</p>
<p>The assert passes if the mock has <em>ever</em> been called, unlike
<a class="reference internal" href="#mock.Mock.assert_called_with" title="mock.Mock.assert_called_with"><tt class="xref py py-meth docutils literal"><span class="pre">assert_called_with()</span></tt></a> and <a class="reference internal" href="#mock.Mock.assert_called_once_with" title="mock.Mock.assert_called_once_with"><tt class="xref py py-meth docutils literal"><span class="pre">assert_called_once_with()</span></tt></a> that
only pass if the call is the most recent one.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="n">arg</span><span class="o">=</span><span class="s">&#39;thing&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="s">&#39;some&#39;</span><span class="p">,</span> <span class="s">&#39;thing&#39;</span><span class="p">,</span> <span class="s">&#39;else&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">assert_any_call</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="n">arg</span><span class="o">=</span><span class="s">&#39;thing&#39;</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="mock.Mock.assert_has_calls">
<tt class="descname">assert_has_calls</tt><big>(</big><em>calls</em>, <em>any_order=False</em><big>)</big><a class="headerlink" href="#mock.Mock.assert_has_calls" title="Permalink to this definition"></a></dt>
<dd><p>assert the mock has been called with the specified calls.
The <cite>mock_calls</cite> list is checked for the calls.</p>
<p>If <cite>any_order</cite> is False (the default) then the calls must be
sequential. There can be extra calls before or after the
specified calls.</p>
<p>If <cite>any_order</cite> is True then the calls can be in any order, but
they must all appear in <a class="reference internal" href="#mock.Mock.mock_calls" title="mock.Mock.mock_calls"><tt class="xref py py-attr docutils literal"><span class="pre">mock_calls</span></tt></a>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">calls</span> <span class="o">=</span> <span class="p">[</span><span class="n">call</span><span class="p">(</span><span class="mi">2</span><span class="p">),</span> <span class="n">call</span><span class="p">(</span><span class="mi">3</span><span class="p">)]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">assert_has_calls</span><span class="p">(</span><span class="n">calls</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">calls</span> <span class="o">=</span> <span class="p">[</span><span class="n">call</span><span class="p">(</span><span class="mi">4</span><span class="p">),</span> <span class="n">call</span><span class="p">(</span><span class="mi">2</span><span class="p">),</span> <span class="n">call</span><span class="p">(</span><span class="mi">3</span><span class="p">)]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">assert_has_calls</span><span class="p">(</span><span class="n">calls</span><span class="p">,</span> <span class="n">any_order</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="mock.Mock.reset_mock">
<tt class="descname">reset_mock</tt><big>(</big><big>)</big><a class="headerlink" href="#mock.Mock.reset_mock" title="Permalink to this definition"></a></dt>
<dd><p>The reset_mock method resets all the call attributes on a mock object:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="s">&#39;hello&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">called</span>
<span class="go">True</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">reset_mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">called</span>
<span class="go">False</span>
</pre></div>
</div>
<p>This can be useful where you want to make a series of assertions that
reuse the same object. Note that <cite>reset_mock</cite> <em>doesn&#8217;t</em> clear the
return value, <a class="reference internal" href="#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a> or any child attributes you have
set using normal assignment. Child mocks and the return value mock
(if any) are reset as well.</p>
</dd></dl>
<dl class="method">
<dt id="mock.Mock.mock_add_spec">
<tt class="descname">mock_add_spec</tt><big>(</big><em>spec</em>, <em>spec_set=False</em><big>)</big><a class="headerlink" href="#mock.Mock.mock_add_spec" title="Permalink to this definition"></a></dt>
<dd><p>Add a spec to a mock. <cite>spec</cite> can either be an object or a
list of strings. Only attributes on the <cite>spec</cite> can be fetched as
attributes from the mock.</p>
<p>If <cite>spec_set</cite> is <cite>True</cite> then only attributes on the spec can be set.</p>
</dd></dl>
<dl class="method">
<dt id="mock.Mock.attach_mock">
<tt class="descname">attach_mock</tt><big>(</big><em>mock</em>, <em>attribute</em><big>)</big><a class="headerlink" href="#mock.Mock.attach_mock" title="Permalink to this definition"></a></dt>
<dd><p>Attach a mock as an attribute of this one, replacing its name and
parent. Calls to the attached mock will be recorded in the
<a class="reference internal" href="#mock.Mock.method_calls" title="mock.Mock.method_calls"><tt class="xref py py-attr docutils literal"><span class="pre">method_calls</span></tt></a> and <a class="reference internal" href="#mock.Mock.mock_calls" title="mock.Mock.mock_calls"><tt class="xref py py-attr docutils literal"><span class="pre">mock_calls</span></tt></a> attributes of this one.</p>
</dd></dl>
<dl class="method">
<dt id="mock.Mock.configure_mock">
<tt class="descname">configure_mock</tt><big>(</big><em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.Mock.configure_mock" title="Permalink to this definition"></a></dt>
<dd><p>Set attributes on the mock through keyword arguments.</p>
<p>Attributes plus return values and side effects can be set on child
mocks using standard dot notation and unpacking a dictionary in the
method call:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">attrs</span> <span class="o">=</span> <span class="p">{</span><span class="s">&#39;method.return_value&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">,</span> <span class="s">&#39;other.side_effect&#39;</span><span class="p">:</span> <span class="ne">KeyError</span><span class="p">}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">configure_mock</span><span class="p">(</span><span class="o">**</span><span class="n">attrs</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">other</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">KeyError</span>
</pre></div>
</div>
<p>The same thing can be achieved in the constructor call to mocks:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">attrs</span> <span class="o">=</span> <span class="p">{</span><span class="s">&#39;method.return_value&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">,</span> <span class="s">&#39;other.side_effect&#39;</span><span class="p">:</span> <span class="ne">KeyError</span><span class="p">}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">some_attribute</span><span class="o">=</span><span class="s">&#39;eggs&#39;</span><span class="p">,</span> <span class="o">**</span><span class="n">attrs</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span>
<span class="go">&#39;eggs&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">other</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">KeyError</span>
</pre></div>
</div>
<p><cite>configure_mock</cite> exists to make it easier to do configuration
after the mock has been created.</p>
</dd></dl>
<dl class="method">
<dt id="mock.Mock.__dir__">
<tt class="descname">__dir__</tt><big>(</big><big>)</big><a class="headerlink" href="#mock.Mock.__dir__" title="Permalink to this definition"></a></dt>
<dd><p><cite>Mock</cite> objects limit the results of <cite>dir(some_mock)</cite> to useful results.
For mocks with a <cite>spec</cite> this includes all the permitted attributes
for the mock.</p>
<p>See <a class="reference internal" href="helpers.html#mock.FILTER_DIR" title="mock.FILTER_DIR"><tt class="xref py py-data docutils literal"><span class="pre">FILTER_DIR</span></tt></a> for what this filtering does, and how to
switch it off.</p>
</dd></dl>
<dl class="method">
<dt id="mock.Mock._get_child_mock">
<tt class="descname">_get_child_mock</tt><big>(</big><em>**kw</em><big>)</big><a class="headerlink" href="#mock.Mock._get_child_mock" title="Permalink to this definition"></a></dt>
<dd><p>Create the child mocks for attributes and return value.
By default child mocks will be the same type as the parent.
Subclasses of Mock may want to override this to customize the way
child mocks are made.</p>
<p>For non-callable mocks the callable variant will be used (rather than
any custom subclass).</p>
</dd></dl>
<dl class="attribute">
<dt id="mock.Mock.called">
<tt class="descname">called</tt><a class="headerlink" href="#mock.Mock.called" title="Permalink to this definition"></a></dt>
<dd><p>A boolean representing whether or not the mock object has been called:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">called</span>
<span class="go">False</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">called</span>
<span class="go">True</span>
</pre></div>
</div>
</dd></dl>
<dl class="attribute">
<dt id="mock.Mock.call_count">
<tt class="descname">call_count</tt><a class="headerlink" href="#mock.Mock.call_count" title="Permalink to this definition"></a></dt>
<dd><p>An integer telling you how many times the mock object has been called:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">call_count</span>
<span class="go">0</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">call_count</span>
<span class="go">2</span>
</pre></div>
</div>
</dd></dl>
<dl class="attribute">
<dt id="mock.Mock.return_value">
<tt class="descname">return_value</tt><a class="headerlink" href="#mock.Mock.return_value" title="Permalink to this definition"></a></dt>
<dd><p>Set this to configure the value returned by calling the mock:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;fish&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="go">&#39;fish&#39;</span>
</pre></div>
</div>
<p>The default return value is a mock object and you can configure it in
the normal way:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">attribute</span> <span class="o">=</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">Attribute</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">return_value</span><span class="p">()</span>
<span class="go">&lt;Mock name=&#39;mock()()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">return_value</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">()</span>
</pre></div>
</div>
<p><cite>return_value</cite> can also be set in the constructor:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">return_value</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="go">3</span>
</pre></div>
</div>
</dd></dl>
<dl class="attribute">
<dt id="mock.Mock.side_effect">
<tt class="descname">side_effect</tt><a class="headerlink" href="#mock.Mock.side_effect" title="Permalink to this definition"></a></dt>
<dd><p>This can either be a function to be called when the mock is called,
or an exception (class or instance) to be raised.</p>
<p>If you pass in a function it will be called with same arguments as the
mock and unless the function returns the <a class="reference internal" href="sentinel.html#mock.DEFAULT" title="mock.DEFAULT"><tt class="xref py py-data docutils literal"><span class="pre">DEFAULT</span></tt></a> singleton the
call to the mock will then return whatever the function returns. If the
function returns <a class="reference internal" href="sentinel.html#mock.DEFAULT" title="mock.DEFAULT"><tt class="xref py py-data docutils literal"><span class="pre">DEFAULT</span></tt></a> then the mock will return its normal
value (from the <a class="reference internal" href="#mock.Mock.return_value" title="mock.Mock.return_value"><tt class="xref py py-attr docutils literal"><span class="pre">return_value</span></tt></a>.</p>
<p>An example of a mock that raises an exception (to test exception
handling of an API):</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="ne">Exception</span><span class="p">(</span><span class="s">&#39;Boom!&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">Exception</span>: <span class="n">Boom!</span>
</pre></div>
</div>
<p>Using <cite>side_effect</cite> to return a sequence of values:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="p">[</span><span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(),</span> <span class="n">mock</span><span class="p">(),</span> <span class="n">mock</span><span class="p">()</span>
<span class="go">(3, 2, 1)</span>
</pre></div>
</div>
<p>The <cite>side_effect</cite> function is called with the same arguments as the
mock (so it is wise for it to take arbitrary args and keyword
arguments) and whatever it returns is used as the return value for
the call. The exception is if <cite>side_effect</cite> returns <a class="reference internal" href="sentinel.html#mock.DEFAULT" title="mock.DEFAULT"><tt class="xref py py-data docutils literal"><span class="pre">DEFAULT</span></tt></a>,
in which case the normal <a class="reference internal" href="#mock.Mock.return_value" title="mock.Mock.return_value"><tt class="xref py py-attr docutils literal"><span class="pre">return_value</span></tt></a> is used.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">side_effect</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">DEFAULT</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="n">side_effect</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="go">3</span>
</pre></div>
</div>
<p><cite>side_effect</cite> can be set in the constructor. Here&#8217;s an example that
adds one to the value the mock is called with and returns it:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">side_effect</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">value</span><span class="p">:</span> <span class="n">value</span> <span class="o">+</span> <span class="mi">1</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="n">side_effect</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="go">4</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="o">-</span><span class="mi">8</span><span class="p">)</span>
<span class="go">-7</span>
</pre></div>
</div>
<p>Setting <cite>side_effect</cite> to <cite>None</cite> clears it:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">mock</span> <span class="kn">import</span> <span class="n">Mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="ne">KeyError</span><span class="p">,</span> <span class="n">return_value</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">KeyError</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="bp">None</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">3</span>
</pre></div>
</div>
</dd></dl>
<dl class="attribute">
<dt id="mock.Mock.call_args">
<tt class="descname">call_args</tt><a class="headerlink" href="#mock.Mock.call_args" title="Permalink to this definition"></a></dt>
<dd><p>This is either <cite>None</cite> (if the mock hasn&#8217;t been called), or the
arguments that the mock was last called with. This will be in the
form of a tuple: the first member is any ordered arguments the mock
was called with (or an empty tuple) and the second member is any
keyword arguments (or an empty dictionary).</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n">mock</span><span class="o">.</span><span class="n">call_args</span>
<span class="go">None</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">call_args</span>
<span class="go">call()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">call_args</span> <span class="o">==</span> <span class="p">()</span>
<span class="go">True</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">call_args</span>
<span class="go">call(3, 4)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">call_args</span> <span class="o">==</span> <span class="p">((</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">),)</span>
<span class="go">True</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="n">key</span><span class="o">=</span><span class="s">&#39;fish&#39;</span><span class="p">,</span> <span class="nb">next</span><span class="o">=</span><span class="s">&#39;w00t!&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">call_args</span>
<span class="go">call(3, 4, 5, key=&#39;fish&#39;, next=&#39;w00t!&#39;)</span>
</pre></div>
</div>
<p><cite>call_args</cite>, along with members of the lists <a class="reference internal" href="#mock.Mock.call_args_list" title="mock.Mock.call_args_list"><tt class="xref py py-attr docutils literal"><span class="pre">call_args_list</span></tt></a>,
<a class="reference internal" href="#mock.Mock.method_calls" title="mock.Mock.method_calls"><tt class="xref py py-attr docutils literal"><span class="pre">method_calls</span></tt></a> and <a class="reference internal" href="#mock.Mock.mock_calls" title="mock.Mock.mock_calls"><tt class="xref py py-attr docutils literal"><span class="pre">mock_calls</span></tt></a> are <a class="reference internal" href="helpers.html#mock.call" title="mock.call"><tt class="xref py py-data docutils literal"><span class="pre">call</span></tt></a> objects.
These are tuples, so they can be unpacked to get at the individual
arguments and make more complex assertions. See
<a class="reference internal" href="helpers.html#calls-as-tuples"><em>calls as tuples</em></a>.</p>
</dd></dl>
<dl class="attribute">
<dt id="mock.Mock.call_args_list">
<tt class="descname">call_args_list</tt><a class="headerlink" href="#mock.Mock.call_args_list" title="Permalink to this definition"></a></dt>
<dd><p>This is a list of all the calls made to the mock object in sequence
(so the length of the list is the number of times it has been
called). Before any calls have been made it is an empty list. The
<a class="reference internal" href="helpers.html#mock.call" title="mock.call"><tt class="xref py py-data docutils literal"><span class="pre">call</span></tt></a> object can be used for conveniently constructing lists of
calls to compare with <cite>call_args_list</cite>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="p">(</span><span class="n">key</span><span class="o">=</span><span class="s">&#39;fish&#39;</span><span class="p">,</span> <span class="nb">next</span><span class="o">=</span><span class="s">&#39;w00t!&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">call_args_list</span>
<span class="go">[call(), call(3, 4), call(key=&#39;fish&#39;, next=&#39;w00t!&#39;)]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">expected</span> <span class="o">=</span> <span class="p">[(),</span> <span class="p">((</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">),),</span> <span class="p">({</span><span class="s">&#39;key&#39;</span><span class="p">:</span> <span class="s">&#39;fish&#39;</span><span class="p">,</span> <span class="s">&#39;next&#39;</span><span class="p">:</span> <span class="s">&#39;w00t!&#39;</span><span class="p">},)]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">call_args_list</span> <span class="o">==</span> <span class="n">expected</span>
<span class="go">True</span>
</pre></div>
</div>
<p>Members of <cite>call_args_list</cite> are <a class="reference internal" href="helpers.html#mock.call" title="mock.call"><tt class="xref py py-data docutils literal"><span class="pre">call</span></tt></a> objects. These can be
unpacked as tuples to get at the individual arguments. See
<a class="reference internal" href="helpers.html#calls-as-tuples"><em>calls as tuples</em></a>.</p>
</dd></dl>
<dl class="attribute">
<dt id="mock.Mock.method_calls">
<tt class="descname">method_calls</tt><a class="headerlink" href="#mock.Mock.method_calls" title="Permalink to this definition"></a></dt>
<dd><p>As well as tracking calls to themselves, mocks also track calls to
methods and attributes, and <em>their</em> methods and attributes:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="go">&lt;Mock name=&#39;mock.method()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">property</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">attribute</span><span class="p">()</span>
<span class="go">&lt;Mock name=&#39;mock.property.method.attribute()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method_calls</span>
<span class="go">[call.method(), call.property.method.attribute()]</span>
</pre></div>
</div>
<p>Members of <cite>method_calls</cite> are <a class="reference internal" href="helpers.html#mock.call" title="mock.call"><tt class="xref py py-data docutils literal"><span class="pre">call</span></tt></a> objects. These can be
unpacked as tuples to get at the individual arguments. See
<a class="reference internal" href="helpers.html#calls-as-tuples"><em>calls as tuples</em></a>.</p>
</dd></dl>
<dl class="attribute">
<dt id="mock.Mock.mock_calls">
<tt class="descname">mock_calls</tt><a class="headerlink" href="#mock.Mock.mock_calls" title="Permalink to this definition"></a></dt>
<dd><p><cite>mock_calls</cite> records <em>all</em> calls to the mock object, its methods, magic
methods <em>and</em> return value mocks.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">result</span> <span class="o">=</span> <span class="n">mock</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">first</span><span class="p">(</span><span class="n">a</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span>
<span class="go">&lt;MagicMock name=&#39;mock.first()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">second</span><span class="p">()</span>
<span class="go">&lt;MagicMock name=&#39;mock.second()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">int</span><span class="p">(</span><span class="n">mock</span><span class="p">)</span>
<span class="go">1</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">result</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="go">&lt;MagicMock name=&#39;mock()()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">expected</span> <span class="o">=</span> <span class="p">[</span><span class="n">call</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">),</span> <span class="n">call</span><span class="o">.</span><span class="n">first</span><span class="p">(</span><span class="n">a</span><span class="o">=</span><span class="mi">3</span><span class="p">),</span> <span class="n">call</span><span class="o">.</span><span class="n">second</span><span class="p">(),</span>
<span class="gp">... </span><span class="n">call</span><span class="o">.</span><span class="n">__int__</span><span class="p">(),</span> <span class="n">call</span><span class="p">()(</span><span class="mi">1</span><span class="p">)]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">mock_calls</span> <span class="o">==</span> <span class="n">expected</span>
<span class="go">True</span>
</pre></div>
</div>
<p>Members of <cite>mock_calls</cite> are <a class="reference internal" href="helpers.html#mock.call" title="mock.call"><tt class="xref py py-data docutils literal"><span class="pre">call</span></tt></a> objects. These can be
unpacked as tuples to get at the individual arguments. See
<a class="reference internal" href="helpers.html#calls-as-tuples"><em>calls as tuples</em></a>.</p>
</dd></dl>
<dl class="attribute">
<dt id="mock.Mock.__class__">
<tt class="descname">__class__</tt><a class="headerlink" href="#mock.Mock.__class__" title="Permalink to this definition"></a></dt>
<dd><p>Normally the <cite>__class__</cite> attribute of an object will return its type.
For a mock object with a <cite>spec</cite> <cite>__class__</cite> returns the spec class
instead. This allows mock objects to pass <cite>isinstance</cite> tests for the
object they are replacing / masquerading as:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">spec</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">isinstance</span><span class="p">(</span><span class="n">mock</span><span class="p">,</span> <span class="nb">int</span><span class="p">)</span>
<span class="go">True</span>
</pre></div>
</div>
<p><cite>__class__</cite> is assignable to, this allows a mock to pass an
<cite>isinstance</cite> check without forcing you to use a spec:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">__class__</span> <span class="o">=</span> <span class="nb">dict</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">isinstance</span><span class="p">(</span><span class="n">mock</span><span class="p">,</span> <span class="nb">dict</span><span class="p">)</span>
<span class="go">True</span>
</pre></div>
</div>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="mock.NonCallableMock">
<em class="property">class </em><tt class="descname">NonCallableMock</tt><big>(</big><em>spec=None</em>, <em>wraps=None</em>, <em>name=None</em>, <em>spec_set=None</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.NonCallableMock" title="Permalink to this definition"></a></dt>
<dd><p>A non-callable version of <cite>Mock</cite>. The constructor parameters have the same
meaning of <cite>Mock</cite>, with the exception of <cite>return_value</cite> and <cite>side_effect</cite>
which have no meaning on a non-callable mock.</p>
</dd></dl>
<p>Mock objects that use a class or an instance as a <cite>spec</cite> or <cite>spec_set</cite> are able
to pass <cite>isintance</cite> tests:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">spec</span><span class="o">=</span><span class="n">SomeClass</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">isinstance</span><span class="p">(</span><span class="n">mock</span><span class="p">,</span> <span class="n">SomeClass</span><span class="p">)</span>
<span class="go">True</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">spec_set</span><span class="o">=</span><span class="n">SomeClass</span><span class="p">())</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">isinstance</span><span class="p">(</span><span class="n">mock</span><span class="p">,</span> <span class="n">SomeClass</span><span class="p">)</span>
<span class="go">True</span>
</pre></div>
</div>
<p>The <cite>Mock</cite> classes have support for mocking magic methods. See <a class="reference internal" href="magicmock.html#magic-methods"><em>magic
methods</em></a> for the full details.</p>
<p>The mock classes and the <a class="reference internal" href="patch.html#mock.patch" title="mock.patch"><tt class="xref py py-func docutils literal"><span class="pre">patch()</span></tt></a> decorators all take arbitrary keyword
arguments for configuration. For the <cite>patch</cite> decorators the keywords are
passed to the constructor of the mock being created. The keyword arguments
are for configuring attributes of the mock:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">m</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">attribute</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">other</span><span class="o">=</span><span class="s">&#39;fish&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">attribute</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">other</span>
<span class="go">&#39;fish&#39;</span>
</pre></div>
</div>
<p>The return value and side effect of child mocks can be set in the same way,
using dotted notation. As you can&#8217;t use dotted names directly in a call you
have to create a dictionary and unpack it using <cite>**</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">attrs</span> <span class="o">=</span> <span class="p">{</span><span class="s">&#39;method.return_value&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">,</span> <span class="s">&#39;other.side_effect&#39;</span><span class="p">:</span> <span class="ne">KeyError</span><span class="p">}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">some_attribute</span><span class="o">=</span><span class="s">&#39;eggs&#39;</span><span class="p">,</span> <span class="o">**</span><span class="n">attrs</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">some_attribute</span>
<span class="go">&#39;eggs&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">other</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">KeyError</span>
</pre></div>
</div>
<dl class="class">
<dt id="mock.PropertyMock">
<em class="property">class </em><tt class="descname">PropertyMock</tt><big>(</big><em>*args</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.PropertyMock" title="Permalink to this definition"></a></dt>
<dd><p>A mock intended to be used as a property, or other descriptor, on a class.
<cite>PropertyMock</cite> provides <cite>__get__</cite> and <cite>__set__</cite> methods so you can specify
a return value when it is fetched.</p>
<p>Fetching a <cite>PropertyMock</cite> instance from an object calls the mock, with
no args. Setting it calls the mock with the value being set.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">Foo</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="nd">@property</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">foo</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="s">&#39;something&#39;</span>
<span class="gp">... </span> <span class="nd">@foo.setter</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">foo</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;__main__.Foo.foo&#39;</span><span class="p">,</span> <span class="n">new_callable</span><span class="o">=</span><span class="n">PropertyMock</span><span class="p">)</span> <span class="k">as</span> <span class="n">mock_foo</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">mock_foo</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;mockity-mock&#39;</span>
<span class="gp">... </span> <span class="n">this_foo</span> <span class="o">=</span> <span class="n">Foo</span><span class="p">()</span>
<span class="gp">... </span> <span class="k">print</span> <span class="n">this_foo</span><span class="o">.</span><span class="n">foo</span>
<span class="gp">... </span> <span class="n">this_foo</span><span class="o">.</span><span class="n">foo</span> <span class="o">=</span> <span class="mi">6</span>
<span class="gp">...</span>
<span class="go">mockity-mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_foo</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[call(), call(6)]</span>
</pre></div>
</div>
</dd></dl>
<p>Because of the way mock attributes are stored you can&#8217;t directly attach a
<cite>PropertyMock</cite> to a mock object. Instead you can attach it to the mock type
object:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">m</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">p</span> <span class="o">=</span> <span class="n">PropertyMock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">type</span><span class="p">(</span><span class="n">m</span><span class="p">)</span><span class="o">.</span><span class="n">foo</span> <span class="o">=</span> <span class="n">p</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">foo</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">p</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">()</span>
</pre></div>
</div>
<span class="target" id="index-5"></span></div>
<div class="section" id="calling">
<span id="index-6"></span><h1>Calling<a class="headerlink" href="#calling" title="Permalink to this headline"></a></h1>
<p>Mock objects are callable. The call will return the value set as the
<a class="reference internal" href="#mock.Mock.return_value" title="mock.Mock.return_value"><tt class="xref py py-attr docutils literal"><span class="pre">return_value</span></tt></a> attribute. The default return value is a new Mock
object; it is created the first time the return value is accessed (either
explicitly or by calling the Mock) - but it is stored and the same one
returned each time.</p>
<p>Calls made to the object will be recorded in the attributes
like <a class="reference internal" href="#mock.Mock.call_args" title="mock.Mock.call_args"><tt class="xref py py-attr docutils literal"><span class="pre">call_args</span></tt></a> and <a class="reference internal" href="#mock.Mock.call_args_list" title="mock.Mock.call_args_list"><tt class="xref py py-attr docutils literal"><span class="pre">call_args_list</span></tt></a>.</p>
<p>If <a class="reference internal" href="#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a> is set then it will be called after the call has
been recorded, so if <cite>side_effect</cite> raises an exception the call is still
recorded.</p>
<p>The simplest way to make a mock raise an exception when called is to make
<a class="reference internal" href="#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a> an exception class or instance:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">m</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="ne">IndexError</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">IndexError</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[call(1, 2, 3)]</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="ne">KeyError</span><span class="p">(</span><span class="s">&#39;Bang!&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">(</span><span class="s">&#39;two&#39;</span><span class="p">,</span> <span class="s">&#39;three&#39;</span><span class="p">,</span> <span class="s">&#39;four&#39;</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">KeyError</span>: <span class="n">&#39;Bang!&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[call(1, 2, 3), call(&#39;two&#39;, &#39;three&#39;, &#39;four&#39;)]</span>
</pre></div>
</div>
<p>If <cite>side_effect</cite> is a function then whatever that function returns is what
calls to the mock return. The <cite>side_effect</cite> function is called with the
same arguments as the mock. This allows you to vary the return value of the
call dynamically, based on the input:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">side_effect</span><span class="p">(</span><span class="n">value</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">value</span> <span class="o">+</span> <span class="mi">1</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="n">side_effect</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="go">2</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[call(1), call(2)]</span>
</pre></div>
</div>
<p>If you want the mock to still return the default return value (a new mock), or
any set return value, then there are two ways of doing this. Either return
<cite>mock.return_value</cite> from inside <cite>side_effect</cite>, or return <a class="reference internal" href="sentinel.html#mock.DEFAULT" title="mock.DEFAULT"><tt class="xref py py-data docutils literal"><span class="pre">DEFAULT</span></tt></a>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">m</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">side_effect</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">m</span><span class="o">.</span><span class="n">return_value</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="n">side_effect</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="mi">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">side_effect</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">DEFAULT</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="n">side_effect</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">3</span>
</pre></div>
</div>
<p>To remove a <cite>side_effect</cite>, and return to the default behaviour, set the
<cite>side_effect</cite> to <cite>None</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">m</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="mi">6</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">side_effect</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="mi">3</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="n">side_effect</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="bp">None</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">6</span>
</pre></div>
</div>
<p>The <cite>side_effect</cite> can also be any iterable object. Repeated calls to the mock
will return values from the iterable (until the iterable is exhausted and
a <cite>StopIteration</cite> is raised):</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">m</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">1</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">2</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">StopIteration</span>
</pre></div>
</div>
<p>If any members of the iterable are exceptions they will be raised instead of
returned:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">iterable</span> <span class="o">=</span> <span class="p">(</span><span class="mi">33</span><span class="p">,</span> <span class="ne">ValueError</span><span class="p">,</span> <span class="mi">66</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">side_effect</span><span class="o">=</span><span class="n">iterable</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">33</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">ValueError</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">m</span><span class="p">()</span>
<span class="go">66</span>
</pre></div>
</div>
</div>
<div class="section" id="deleting-attributes">
<span id="id2"></span><h1>Deleting Attributes<a class="headerlink" href="#deleting-attributes" title="Permalink to this headline"></a></h1>
<p>Mock objects create attributes on demand. This allows them to pretend to be
objects of any type.</p>
<p>You may want a mock object to return <cite>False</cite> to a <cite>hasattr</cite> call, or raise an
<cite>AttributeError</cite> when an attribute is fetched. You can do this by providing
an object as a <cite>spec</cite> for a mock, but that isn&#8217;t always convenient.</p>
<p>You &#8220;block&#8221; attributes by deleting them. Once deleted, accessing an attribute
will raise an <cite>AttributeError</cite>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">hasattr</span><span class="p">(</span><span class="n">mock</span><span class="p">,</span> <span class="s">&#39;m&#39;</span><span class="p">)</span>
<span class="go">True</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">del</span> <span class="n">mock</span><span class="o">.</span><span class="n">m</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nb">hasattr</span><span class="p">(</span><span class="n">mock</span><span class="p">,</span> <span class="s">&#39;m&#39;</span><span class="p">)</span>
<span class="go">False</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">del</span> <span class="n">mock</span><span class="o">.</span><span class="n">f</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">f</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="o">...</span>
<span class="gr">AttributeError</span>: <span class="n">f</span>
</pre></div>
</div>
</div>
<div class="section" id="attaching-mocks-as-attributes">
<h1>Attaching Mocks as Attributes<a class="headerlink" href="#attaching-mocks-as-attributes" title="Permalink to this headline"></a></h1>
<p>When you attach a mock as an attribute of another mock (or as the return
value) it becomes a &#8220;child&#8221; of that mock. Calls to the child are recorded in
the <a class="reference internal" href="#mock.Mock.method_calls" title="mock.Mock.method_calls"><tt class="xref py py-attr docutils literal"><span class="pre">method_calls</span></tt></a> and <a class="reference internal" href="#mock.Mock.mock_calls" title="mock.Mock.mock_calls"><tt class="xref py py-attr docutils literal"><span class="pre">mock_calls</span></tt></a> attributes of the
parent. This is useful for configuring child mocks and then attaching them to
the parent, or for attaching mocks to a parent that records all calls to the
children and allows you to make assertions about the order of calls between
mocks:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">parent</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">child1</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">child2</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">parent</span><span class="o">.</span><span class="n">child1</span> <span class="o">=</span> <span class="n">child1</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">parent</span><span class="o">.</span><span class="n">child2</span> <span class="o">=</span> <span class="n">child2</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">child1</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">child2</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">parent</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[call.child1(1), call.child2(2)]</span>
</pre></div>
</div>
<p>The exception to this is if the mock has a name. This allows you to prevent
the &#8220;parenting&#8221; if for some reason you don&#8217;t want it to happen.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">not_a_child</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;not-a-child&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">attribute</span> <span class="o">=</span> <span class="n">not_a_child</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">attribute</span><span class="p">()</span>
<span class="go">&lt;MagicMock name=&#39;not-a-child()&#39; id=&#39;...&#39;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[]</span>
</pre></div>
</div>
<p>Mocks created for you by <a class="reference internal" href="patch.html#mock.patch" title="mock.patch"><tt class="xref py py-func docutils literal"><span class="pre">patch()</span></tt></a> are automatically given names. To
attach mocks that have names to a parent you use the <a class="reference internal" href="#mock.Mock.attach_mock" title="mock.Mock.attach_mock"><tt class="xref py py-meth docutils literal"><span class="pre">attach_mock()</span></tt></a>
method:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">thing1</span> <span class="o">=</span> <span class="nb">object</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">thing2</span> <span class="o">=</span> <span class="nb">object</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">parent</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;__main__.thing1&#39;</span><span class="p">,</span> <span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span> <span class="k">as</span> <span class="n">child1</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">with</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;__main__.thing2&#39;</span><span class="p">,</span> <span class="n">return_value</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span> <span class="k">as</span> <span class="n">child2</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">parent</span><span class="o">.</span><span class="n">attach_mock</span><span class="p">(</span><span class="n">child1</span><span class="p">,</span> <span class="s">&#39;child1&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">parent</span><span class="o">.</span><span class="n">attach_mock</span><span class="p">(</span><span class="n">child2</span><span class="p">,</span> <span class="s">&#39;child2&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">child1</span><span class="p">(</span><span class="s">&#39;one&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">child2</span><span class="p">(</span><span class="s">&#39;two&#39;</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">parent</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[call.child1(&#39;one&#39;), call.child2(&#39;two&#39;)]</span>
</pre></div>
</div>
<hr class="docutils" />
<table class="docutils footnote" frame="void" id="id3" rules="none">
<colgroup><col class="label" /><col /></colgroup>
<tbody valign="top">
<tr><td class="label"><a class="fn-backref" href="#id1">[1]</a></td><td>The only exceptions are magic methods and attributes (those that have
leading and trailing double underscores). Mock doesn&#8217;t create these but
instead of raises an <tt class="docutils literal"><span class="pre">AttributeError</span></tt>. This is because the interpreter
will often implicitly request these methods, and gets <em>very</em> confused to
get a new Mock object when it expects a magic method. If you need magic
method support see <a class="reference internal" href="magicmock.html#magic-methods"><em>magic methods</em></a>.</td></tr>
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<div class="body">
<div class="section" id="mocksignature">
<h1>mocksignature<a class="headerlink" href="#mocksignature" title="Permalink to this headline"></a></h1>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><a class="reference internal" href="helpers.html#auto-speccing"><em>Autospeccing</em></a>, added in mock 0.8, is a more advanced version of
<cite>mocksignature</cite> and can be used for many of the same use cases.</p>
</div>
<p>A problem with using mock objects to replace real objects in your tests is that
<a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt></a> can be <em>too</em> flexible. Your code can treat the mock objects in
any way and you have to manually check that they were called correctly. If your
code calls functions or methods with the wrong number of arguments then mocks
don&#8217;t complain.</p>
<p>The solution to this is <cite>mocksignature</cite>, which creates functions with the
same signature as the original, but delegating to a mock. You can interrogate
the mock in the usual way to check it has been called with the <em>right</em>
arguments, but if it is called with the wrong number of arguments it will
raise a <cite>TypeError</cite> in the same way your production code would.</p>
<p>Another advantage is that your mocked objects are real functions, which can
be useful when your code uses
<a class="reference external" href="http://docs.python.org/library/inspect.html">inspect</a> or depends on
functions being function objects.</p>
<dl class="function">
<dt id="mock.mocksignature">
<tt class="descname">mocksignature</tt><big>(</big><em>func</em>, <em>mock=None</em>, <em>skipfirst=False</em><big>)</big><a class="headerlink" href="#mock.mocksignature" title="Permalink to this definition"></a></dt>
<dd><p>Create a new function with the same signature as <cite>func</cite> that delegates
to <cite>mock</cite>. If <cite>skipfirst</cite> is True the first argument is skipped, useful
for methods where <cite>self</cite> needs to be omitted from the new function.</p>
<p>If you don&#8217;t pass in a <cite>mock</cite> then one will be created for you.</p>
<p>Functions returned by <cite>mocksignature</cite> have many of the same attributes
and assert methods as a mock object.</p>
<p>The mock is set as the <cite>mock</cite> attribute of the returned function for easy
access.</p>
<p><cite>mocksignature</cite> can also be used with classes. It copies the signature of
the <cite>__init__</cite> method.</p>
<p>When used with callable objects (instances) it copies the signature of the
<cite>__call__</cite> method.</p>
</dd></dl>
<p><cite>mocksignature</cite> will work out if it is mocking the signature of a method on
an instance or a method on a class and do the &#8220;right thing&#8221; with the <cite>self</cite>
argument in both cases.</p>
<p>Because of a limitation in the way that arguments are collected by functions
created by <cite>mocksignature</cite> they are <em>always</em> passed as positional arguments
(including defaults) and not keyword arguments.</p>
<div class="section" id="mocksignature-api">
<h2>mocksignature api<a class="headerlink" href="#mocksignature-api" title="Permalink to this headline"></a></h2>
<p>Although the objects returned by <cite>mocksignature</cite> api are real function objects,
they have much of the same api as the <a class="reference internal" href="mock.html#mock.Mock" title="mock.Mock"><tt class="xref py py-class docutils literal"><span class="pre">Mock</span></tt></a> class. This includes the
assert methods:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">func</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span> <span class="o">=</span> <span class="n">mocksignature</span><span class="p">(</span><span class="n">func</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="o">.</span><span class="n">called</span>
<span class="go">False</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="mi">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="o">.</span><span class="n">called</span>
<span class="go">True</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">AssertionError: Expected call</span>: <span class="n">mock(1, 2, 4)</span>
<span class="go">Actual call: mock(1, 2, 3)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="o">.</span><span class="n">call_count</span>
<span class="go">1</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="o">.</span><span class="n">side_effect</span> <span class="o">=</span> <span class="ne">IndexError</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="p">(</span><span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">6</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">IndexError</span>
</pre></div>
</div>
<p>The mock object that is being delegated to is available as the <cite>mock</cite> attribute
of the function created by <cite>mocksignature</cite>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">func2</span><span class="o">.</span><span class="n">mock</span><span class="o">.</span><span class="n">mock_calls</span>
<span class="go">[call(1, 2, 3), call(4, 5, 6)]</span>
</pre></div>
</div>
<p>The methods and attributes available on functions returned by <cite>mocksignature</cite>
are:</p>
<blockquote>
<div><a class="reference internal" href="mock.html#mock.Mock.assert_any_call" title="mock.Mock.assert_any_call"><tt class="xref py py-meth docutils literal"><span class="pre">assert_any_call()</span></tt></a>, <a class="reference internal" href="mock.html#mock.Mock.assert_called_once_with" title="mock.Mock.assert_called_once_with"><tt class="xref py py-meth docutils literal"><span class="pre">assert_called_once_with()</span></tt></a>,
<a class="reference internal" href="mock.html#mock.Mock.assert_called_with" title="mock.Mock.assert_called_with"><tt class="xref py py-meth docutils literal"><span class="pre">assert_called_with()</span></tt></a>, <a class="reference internal" href="mock.html#mock.Mock.assert_has_calls" title="mock.Mock.assert_has_calls"><tt class="xref py py-meth docutils literal"><span class="pre">assert_has_calls()</span></tt></a>,
<a class="reference internal" href="mock.html#mock.Mock.call_args" title="mock.Mock.call_args"><tt class="xref py py-attr docutils literal"><span class="pre">call_args</span></tt></a>, <a class="reference internal" href="mock.html#mock.Mock.call_args_list" title="mock.Mock.call_args_list"><tt class="xref py py-attr docutils literal"><span class="pre">call_args_list</span></tt></a>,
<a class="reference internal" href="mock.html#mock.Mock.call_count" title="mock.Mock.call_count"><tt class="xref py py-attr docutils literal"><span class="pre">call_count</span></tt></a>, <a class="reference internal" href="mock.html#mock.Mock.called" title="mock.Mock.called"><tt class="xref py py-attr docutils literal"><span class="pre">called</span></tt></a>,
<a class="reference internal" href="mock.html#mock.Mock.method_calls" title="mock.Mock.method_calls"><tt class="xref py py-attr docutils literal"><span class="pre">method_calls</span></tt></a>, <cite>mock</cite>, <a class="reference internal" href="mock.html#mock.Mock.mock_calls" title="mock.Mock.mock_calls"><tt class="xref py py-attr docutils literal"><span class="pre">mock_calls</span></tt></a>,
<a class="reference internal" href="mock.html#mock.Mock.reset_mock" title="mock.Mock.reset_mock"><tt class="xref py py-meth docutils literal"><span class="pre">reset_mock()</span></tt></a>, <a class="reference internal" href="mock.html#mock.Mock.return_value" title="mock.Mock.return_value"><tt class="xref py py-attr docutils literal"><span class="pre">return_value</span></tt></a>, and
<a class="reference internal" href="mock.html#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a>.</div></blockquote>
</div>
<div class="section" id="example-use">
<h2>Example use<a class="headerlink" href="#example-use" title="Permalink to this headline"></a></h2>
<div class="section" id="basic-use">
<h3>Basic use<a class="headerlink" href="#basic-use" title="Permalink to this headline"></a></h3>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">function</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span> <span class="o">=</span> <span class="n">mocksignature</span><span class="p">(</span><span class="n">function</span><span class="p">,</span> <span class="n">mock</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">TypeError</span>: <span class="n">&lt;lambda&gt;() takes at least 2 arguments (0 given)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;some value&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="s">&#39;foo&#39;</span><span class="p">)</span>
<span class="go">&#39;some value&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="s">&#39;foo&#39;</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="keyword-arguments">
<h3>Keyword arguments<a class="headerlink" href="#keyword-arguments" title="Permalink to this headline"></a></h3>
<p>Note that arguments to functions created by <cite>mocksignature</cite> are always passed
in to the underlying mock by position even when called with keywords:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">function</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span> <span class="o">=</span> <span class="n">mocksignature</span><span class="p">(</span><span class="n">function</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="bp">None</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="mocking-methods-and-self">
<h3>Mocking methods and self<a class="headerlink" href="#mocking-methods-and-self" title="Permalink to this headline"></a></h3>
<p>When you use <cite>mocksignature</cite> to replace a method on a class then <cite>self</cite>
will be included in the method signature - and you will need to include
the instance when you do your asserts.</p>
<p>As a curious factor of the way Python (2) wraps methods fetched from a class,
we can <em>get</em> the <cite>return_value</cite> from a function set on a class, but we can&#8217;t
set it. We have to do this through the exposed <cite>mock</cite> attribute instead:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">SomeClass</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">method</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">SomeClass</span><span class="o">.</span><span class="n">method</span> <span class="o">=</span> <span class="n">mocksignature</span><span class="p">(</span><span class="n">SomeClass</span><span class="o">.</span><span class="n">method</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">SomeClass</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">mock</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="bp">None</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span> <span class="o">=</span> <span class="n">SomeClass</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">TypeError</span>: <span class="n">&lt;lambda&gt;() takes at least 4 arguments (1 given)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="n">instance</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
</pre></div>
</div>
<p>When you use <cite>mocksignature</cite> on instance methods <cite>self</cite> isn&#8217;t included (and we
can set the <cite>return_value</cite> etc directly):</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">SomeClass</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">method</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span> <span class="o">=</span> <span class="n">SomeClass</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span><span class="o">.</span><span class="n">method</span> <span class="o">=</span> <span class="n">mocksignature</span><span class="p">(</span><span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="bp">None</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="mocksignature-with-classes">
<h3>mocksignature with classes<a class="headerlink" href="#mocksignature-with-classes" title="Permalink to this headline"></a></h3>
<p>When used with a class <cite>mocksignature</cite> copies the signature of the <cite>__init__</cite>
method.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">Something</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">foo</span><span class="p">,</span> <span class="n">bar</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MockSomething</span> <span class="o">=</span> <span class="n">mocksignature</span><span class="p">(</span><span class="n">Something</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span> <span class="o">=</span> <span class="n">MockSomething</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">9</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">instance</span> <span class="ow">is</span> <span class="n">MockSomething</span><span class="o">.</span><span class="n">return_value</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MockSomething</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">9</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MockSomething</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">TypeError</span>: <span class="n">&lt;lambda&gt;() takes at least 2 arguments (0 given)</span>
</pre></div>
</div>
<p>Because the object returned by <cite>mocksignature</cite> is a function rather than a
<cite>Mock</cite> you lose the other capabilities of <cite>Mock</cite>, like dynamic attribute
creation.</p>
</div>
<div class="section" id="mocksignature-with-callable-objects">
<h3>mocksignature with callable objects<a class="headerlink" href="#mocksignature-with-callable-objects" title="Permalink to this headline"></a></h3>
<p>When used with a callable object <cite>mocksignature</cite> copies the signature of the
<cite>__call__</cite> method.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">Something</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">spam</span><span class="p">,</span> <span class="n">eggs</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">something</span> <span class="o">=</span> <span class="n">Something</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_something</span> <span class="o">=</span> <span class="n">mocksignature</span><span class="p">(</span><span class="n">something</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">result</span> <span class="o">=</span> <span class="n">mock_something</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">9</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_something</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">9</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_something</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">TypeError</span>: <span class="n">&lt;lambda&gt;() takes at least 2 arguments (0 given)</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="mocksignature-argument-to-patch">
<h2>mocksignature argument to patch<a class="headerlink" href="#mocksignature-argument-to-patch" title="Permalink to this headline"></a></h2>
<p><cite>mocksignature</cite> is available as a keyword argument to <a class="reference internal" href="patch.html#mock.patch" title="mock.patch"><tt class="xref py py-func docutils literal"><span class="pre">patch()</span></tt></a> or
<a class="reference internal" href="patch.html#mock.patch.object" title="mock.patch.object"><tt class="xref py py-func docutils literal"><span class="pre">patch.object()</span></tt></a>. It can be used with functions / methods / classes and
callable objects.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">SomeClass</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">method</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch.object</span><span class="p">(</span><span class="n">SomeClass</span><span class="p">,</span> <span class="s">&#39;method&#39;</span><span class="p">,</span> <span class="n">mocksignature</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="n">mock_method</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">instance</span> <span class="o">=</span> <span class="n">SomeClass</span><span class="p">()</span>
<span class="gp">... </span> <span class="n">mock_method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="bp">None</span>
<span class="gp">... </span> <span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">mock_method</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="n">instance</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
</pre></div>
</div>
</div>
</div>
</div>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">mocksignature</a><ul>
<li><a class="reference internal" href="#mocksignature-api">mocksignature api</a></li>
<li><a class="reference internal" href="#example-use">Example use</a><ul>
<li><a class="reference internal" href="#basic-use">Basic use</a></li>
<li><a class="reference internal" href="#keyword-arguments">Keyword arguments</a></li>
<li><a class="reference internal" href="#mocking-methods-and-self">Mocking methods and self</a></li>
<li><a class="reference internal" href="#mocksignature-with-classes">mocksignature with classes</a></li>
<li><a class="reference internal" href="#mocksignature-with-callable-objects">mocksignature with callable objects</a></li>
</ul>
</li>
<li><a class="reference internal" href="#mocksignature-argument-to-patch">mocksignature argument to patch</a></li>
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=====================================================
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<div class="section" id="patch-decorators">
<h1>Patch Decorators<a class="headerlink" href="#patch-decorators" title="Permalink to this headline"></a></h1>
<p>The patch decorators are used for patching objects only within the scope of
the function they decorate. They automatically handle the unpatching for you,
even if exceptions are raised. All of these functions can also be used in with
statements or as class decorators.</p>
<div class="section" id="patch">
<h2>patch<a class="headerlink" href="#patch" title="Permalink to this headline"></a></h2>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><cite>patch</cite> is straightforward to use. The key is to do the patching in the
right namespace. See the section <a class="reference internal" href="#id1">where to patch</a>.</p>
</div>
<dl class="function">
<dt id="mock.patch">
<tt class="descname">patch</tt><big>(</big><em>target</em>, <em>new=DEFAULT</em>, <em>spec=None</em>, <em>create=False</em>, <em>spec_set=None</em>, <em>autospec=None</em>, <em>new_callable=None</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.patch" title="Permalink to this definition"></a></dt>
<dd><p><cite>patch</cite> acts as a function decorator, class decorator or a context
manager. Inside the body of the function or with statement, the <cite>target</cite>
is patched with a <cite>new</cite> object. When the function/with statement exits
the patch is undone.</p>
<p>If <cite>new</cite> is omitted, then the target is replaced with a
<a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a>. If <cite>patch</cite> is used as a decorator and <cite>new</cite> is
omitted, the created mock is passed in as an extra argument to the
decorated function. If <cite>patch</cite> is used as a context manager the created
mock is returned by the context manager.</p>
<p><cite>target</cite> should be a string in the form <cite>&#8216;package.module.ClassName&#8217;</cite>. The
<cite>target</cite> is imported and the specified object replaced with the <cite>new</cite>
object, so the <cite>target</cite> must be importable from the environment you are
calling <cite>patch</cite> from. The target is imported when the decorated function
is executed, not at decoration time.</p>
<p>The <cite>spec</cite> and <cite>spec_set</cite> keyword arguments are passed to the <cite>MagicMock</cite>
if patch is creating one for you.</p>
<p>In addition you can pass <cite>spec=True</cite> or <cite>spec_set=True</cite>, which causes
patch to pass in the object being mocked as the spec/spec_set object.</p>
<p><cite>new_callable</cite> allows you to specify a different class, or callable object,
that will be called to create the <cite>new</cite> object. By default <cite>MagicMock</cite> is
used.</p>
<p>A more powerful form of <cite>spec</cite> is <cite>autospec</cite>. If you set <cite>autospec=True</cite>
then the mock with be created with a spec from the object being replaced.
All attributes of the mock will also have the spec of the corresponding
attribute of the object being replaced. Methods and functions being mocked
will have their arguments checked and will raise a <cite>TypeError</cite> if they are
called with the wrong signature. For mocks
replacing a class, their return value (the &#8216;instance&#8217;) will have the same
spec as the class. See the <a class="reference internal" href="helpers.html#mock.create_autospec" title="mock.create_autospec"><tt class="xref py py-func docutils literal"><span class="pre">create_autospec()</span></tt></a> function and
<a class="reference internal" href="helpers.html#auto-speccing"><em>Autospeccing</em></a>.</p>
<p>Instead of <cite>autospec=True</cite> you can pass <cite>autospec=some_object</cite> to use an
arbitrary object as the spec instead of the one being replaced.</p>
<p>By default <cite>patch</cite> will fail to replace attributes that don&#8217;t exist. If
you pass in <cite>create=True</cite>, and the attribute doesn&#8217;t exist, patch will
create the attribute for you when the patched function is called, and
delete it again afterwards. This is useful for writing tests against
attributes that your production code creates at runtime. It is off by by
default because it can be dangerous. With it switched on you can write
passing tests against APIs that don&#8217;t actually exist!</p>
<p>Patch can be used as a <cite>TestCase</cite> class decorator. It works by
decorating each test method in the class. This reduces the boilerplate
code when your test methods share a common patchings set. <cite>patch</cite> finds
tests by looking for method names that start with <cite>patch.TEST_PREFIX</cite>.
By default this is <cite>test</cite>, which matches the way <cite>unittest</cite> finds tests.
You can specify an alternative prefix by setting <cite>patch.TEST_PREFIX</cite>.</p>
<p>Patch can be used as a context manager, with the with statement. Here the
patching applies to the indented block after the with statement. If you
use &#8220;as&#8221; then the patched object will be bound to the name after the
&#8220;as&#8221;; very useful if <cite>patch</cite> is creating a mock object for you.</p>
<p><cite>patch</cite> takes arbitrary keyword arguments. These will be passed to
the <cite>Mock</cite> (or <cite>new_callable</cite>) on construction.</p>
<p><cite>patch.dict(...)</cite>, <cite>patch.multiple(...)</cite> and <cite>patch.object(...)</cite> are
available for alternate use-cases.</p>
</dd></dl>
<p><cite>patch</cite> as function decorator, creating the mock for you and passing it into
the decorated function:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;__main__.SomeClass&#39;</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">function</span><span class="p">(</span><span class="n">normal_argument</span><span class="p">,</span> <span class="n">mock_class</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">print</span> <span class="n">mock_class</span> <span class="ow">is</span> <span class="n">SomeClass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">function</span><span class="p">(</span><span class="bp">None</span><span class="p">)</span>
<span class="go">True</span>
</pre></div>
</div>
<p>Patching a class replaces the class with a <cite>MagicMock</cite> <em>instance</em>. If the
class is instantiated in the code under test then it will be the
<a class="reference internal" href="mock.html#mock.Mock.return_value" title="mock.Mock.return_value"><tt class="xref py py-attr docutils literal"><span class="pre">return_value</span></tt></a> of the mock that will be used.</p>
<p>If the class is instantiated multiple times you could use
<a class="reference internal" href="mock.html#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a> to return a new mock each time. Alternatively you
can set the <cite>return_value</cite> to be anything you want.</p>
<p>To configure return values on methods of <em>instances</em> on the patched class
you must do this on the <cite>return_value</cite>. For example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">Class</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">method</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;__main__.Class&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">MockClass</span><span class="p">:</span>
<span class="gp">... </span> <span class="n">instance</span> <span class="o">=</span> <span class="n">MockClass</span><span class="o">.</span><span class="n">return_value</span>
<span class="gp">... </span> <span class="n">instance</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;foo&#39;</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">Class</span><span class="p">()</span> <span class="ow">is</span> <span class="n">instance</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">Class</span><span class="p">()</span><span class="o">.</span><span class="n">method</span><span class="p">()</span> <span class="o">==</span> <span class="s">&#39;foo&#39;</span>
<span class="gp">...</span>
</pre></div>
</div>
<p>If you use <cite>spec</cite> or <cite>spec_set</cite> and <cite>patch</cite> is replacing a <em>class</em>, then the
return value of the created mock will have the same spec.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">Original</span> <span class="o">=</span> <span class="n">Class</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">patcher</span> <span class="o">=</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;__main__.Class&#39;</span><span class="p">,</span> <span class="n">spec</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MockClass</span> <span class="o">=</span> <span class="n">patcher</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">instance</span> <span class="o">=</span> <span class="n">MockClass</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">instance</span><span class="p">,</span> <span class="n">Original</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">patcher</span><span class="o">.</span><span class="n">stop</span><span class="p">()</span>
</pre></div>
</div>
<p>The <cite>new_callable</cite> argument is useful where you want to use an alternative
class to the default <a class="reference internal" href="magicmock.html#mock.MagicMock" title="mock.MagicMock"><tt class="xref py py-class docutils literal"><span class="pre">MagicMock</span></tt></a> for the created mock. For example, if
you wanted a <a class="reference internal" href="mock.html#mock.NonCallableMock" title="mock.NonCallableMock"><tt class="xref py py-class docutils literal"><span class="pre">NonCallableMock</span></tt></a> to be used:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">thing</span> <span class="o">=</span> <span class="nb">object</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;__main__.thing&#39;</span><span class="p">,</span> <span class="n">new_callable</span><span class="o">=</span><span class="n">NonCallableMock</span><span class="p">)</span> <span class="k">as</span> <span class="n">mock_thing</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">thing</span> <span class="ow">is</span> <span class="n">mock_thing</span>
<span class="gp">... </span> <span class="n">thing</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">TypeError</span>: <span class="n">&#39;NonCallableMock&#39; object is not callable</span>
</pre></div>
</div>
<p>Another use case might be to replace an object with a <cite>StringIO</cite> instance:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">StringIO</span> <span class="kn">import</span> <span class="n">StringIO</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">foo</span><span class="p">():</span>
<span class="gp">... </span> <span class="k">print</span> <span class="s">&#39;Something&#39;</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;sys.stdout&#39;</span><span class="p">,</span> <span class="n">new_callable</span><span class="o">=</span><span class="n">StringIO</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="n">mock_stdout</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">foo</span><span class="p">()</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">mock_stdout</span><span class="o">.</span><span class="n">getvalue</span><span class="p">()</span> <span class="o">==</span> <span class="s">&#39;Something</span><span class="se">\n</span><span class="s">&#39;</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
</pre></div>
</div>
<p>When <cite>patch</cite> is creating a mock for you, it is common that the first thing
you need to do is to configure the mock. Some of that configuration can be done
in the call to patch. Any arbitrary keywords you pass into the call will be
used to set attributes on the created mock:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">patcher</span> <span class="o">=</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;__main__.thing&#39;</span><span class="p">,</span> <span class="n">first</span><span class="o">=</span><span class="s">&#39;one&#39;</span><span class="p">,</span> <span class="n">second</span><span class="o">=</span><span class="s">&#39;two&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_thing</span> <span class="o">=</span> <span class="n">patcher</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_thing</span><span class="o">.</span><span class="n">first</span>
<span class="go">&#39;one&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_thing</span><span class="o">.</span><span class="n">second</span>
<span class="go">&#39;two&#39;</span>
</pre></div>
</div>
<p>As well as attributes on the created mock attributes, like the
<a class="reference internal" href="mock.html#mock.Mock.return_value" title="mock.Mock.return_value"><tt class="xref py py-attr docutils literal"><span class="pre">return_value</span></tt></a> and <a class="reference internal" href="mock.html#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a>, of child mocks can
also be configured. These aren&#8217;t syntactically valid to pass in directly as
keyword arguments, but a dictionary with these as keys can still be expanded
into a <cite>patch</cite> call using <cite>**</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">config</span> <span class="o">=</span> <span class="p">{</span><span class="s">&#39;method.return_value&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">,</span> <span class="s">&#39;other.side_effect&#39;</span><span class="p">:</span> <span class="ne">KeyError</span><span class="p">}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">patcher</span> <span class="o">=</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;__main__.thing&#39;</span><span class="p">,</span> <span class="o">**</span><span class="n">config</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_thing</span> <span class="o">=</span> <span class="n">patcher</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_thing</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="go">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock_thing</span><span class="o">.</span><span class="n">other</span><span class="p">()</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">KeyError</span>
</pre></div>
</div>
</div>
<div class="section" id="patch-object">
<h2>patch.object<a class="headerlink" href="#patch-object" title="Permalink to this headline"></a></h2>
<dl class="function">
<dt id="mock.patch.object">
<tt class="descclassname">patch.</tt><tt class="descname">object</tt><big>(</big><em>target</em>, <em>attribute</em>, <em>new=DEFAULT</em>, <em>spec=None</em>, <em>create=False</em>, <em>spec_set=None</em>, <em>autospec=None</em>, <em>new_callable=None</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.patch.object" title="Permalink to this definition"></a></dt>
<dd><p>patch the named member (<cite>attribute</cite>) on an object (<cite>target</cite>) with a mock
object.</p>
<p><cite>patch.object</cite> can be used as a decorator, class decorator or a context
manager. Arguments <cite>new</cite>, <cite>spec</cite>, <cite>create</cite>, <cite>spec_set</cite>, <cite>autospec</cite> and
<cite>new_callable</cite> have the same meaning as for <cite>patch</cite>. Like <cite>patch</cite>,
<cite>patch.object</cite> takes arbitrary keyword arguments for configuring the mock
object it creates.</p>
<p>When used as a class decorator <cite>patch.object</cite> honours <cite>patch.TEST_PREFIX</cite>
for choosing which methods to wrap.</p>
</dd></dl>
<p>You can either call <cite>patch.object</cite> with three arguments or two arguments. The
three argument form takes the object to be patched, the attribute name and the
object to replace the attribute with.</p>
<p>When calling with the two argument form you omit the replacement object, and a
mock is created for you and passed in as an extra argument to the decorated
function:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch.object</span><span class="p">(</span><span class="n">SomeClass</span><span class="p">,</span> <span class="s">&#39;class_method&#39;</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="n">mock_method</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">class_method</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">mock_method</span><span class="o">.</span><span class="n">assert_called_with</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test</span><span class="p">()</span>
</pre></div>
</div>
<p><cite>spec</cite>, <cite>create</cite> and the other arguments to <cite>patch.object</cite> have the same
meaning as they do for <cite>patch</cite>.</p>
</div>
<div class="section" id="patch-dict">
<h2>patch.dict<a class="headerlink" href="#patch-dict" title="Permalink to this headline"></a></h2>
<dl class="function">
<dt id="mock.patch.dict">
<tt class="descclassname">patch.</tt><tt class="descname">dict</tt><big>(</big><em>in_dict</em>, <em>values=()</em>, <em>clear=False</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.patch.dict" title="Permalink to this definition"></a></dt>
<dd><p>Patch a dictionary, or dictionary like object, and restore the dictionary
to its original state after the test.</p>
<p><cite>in_dict</cite> can be a dictionary or a mapping like container. If it is a
mapping then it must at least support getting, setting and deleting items
plus iterating over keys.</p>
<p><cite>in_dict</cite> can also be a string specifying the name of the dictionary, which
will then be fetched by importing it.</p>
<p><cite>values</cite> can be a dictionary of values to set in the dictionary. <cite>values</cite>
can also be an iterable of <cite>(key, value)</cite> pairs.</p>
<p>If <cite>clear</cite> is True then the dictionary will be cleared before the new
values are set.</p>
<p><cite>patch.dict</cite> can also be called with arbitrary keyword arguments to set
values in the dictionary.</p>
<p><cite>patch.dict</cite> can be used as a context manager, decorator or class
decorator. When used as a class decorator <cite>patch.dict</cite> honours
<cite>patch.TEST_PREFIX</cite> for choosing which methods to wrap.</p>
</dd></dl>
<p><cite>patch.dict</cite> can be used to add members to a dictionary, or simply let a test
change a dictionary, and ensure the dictionary is restored when the test
ends.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">mock</span> <span class="kn">import</span> <span class="n">patch</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">foo</span> <span class="o">=</span> <span class="p">{}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">dict</span><span class="p">(</span><span class="n">foo</span><span class="p">,</span> <span class="p">{</span><span class="s">&#39;newkey&#39;</span><span class="p">:</span> <span class="s">&#39;newvalue&#39;</span><span class="p">}):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">foo</span> <span class="o">==</span> <span class="p">{</span><span class="s">&#39;newkey&#39;</span><span class="p">:</span> <span class="s">&#39;newvalue&#39;</span><span class="p">}</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">foo</span> <span class="o">==</span> <span class="p">{}</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">os</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">dict</span><span class="p">(</span><span class="s">&#39;os.environ&#39;</span><span class="p">,</span> <span class="p">{</span><span class="s">&#39;newkey&#39;</span><span class="p">:</span> <span class="s">&#39;newvalue&#39;</span><span class="p">}):</span>
<span class="gp">... </span> <span class="k">print</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">&#39;newkey&#39;</span><span class="p">]</span>
<span class="gp">...</span>
<span class="go">newvalue</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="s">&#39;newkey&#39;</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span>
</pre></div>
</div>
<p>Keywords can be used in the <cite>patch.dict</cite> call to set values in the dictionary:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">mymodule</span> <span class="o">=</span> <span class="n">MagicMock</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mymodule</span><span class="o">.</span><span class="n">function</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="s">&#39;fish&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">dict</span><span class="p">(</span><span class="s">&#39;sys.modules&#39;</span><span class="p">,</span> <span class="n">mymodule</span><span class="o">=</span><span class="n">mymodule</span><span class="p">):</span>
<span class="gp">... </span> <span class="kn">import</span> <span class="nn">mymodule</span>
<span class="gp">... </span> <span class="n">mymodule</span><span class="o">.</span><span class="n">function</span><span class="p">(</span><span class="s">&#39;some&#39;</span><span class="p">,</span> <span class="s">&#39;args&#39;</span><span class="p">)</span>
<span class="gp">...</span>
<span class="go">&#39;fish&#39;</span>
</pre></div>
</div>
<p><cite>patch.dict</cite> can be used with dictionary like objects that aren&#8217;t actually
dictionaries. At the very minimum they must support item getting, setting,
deleting and either iteration or membership test. This corresponds to the
magic methods <cite>__getitem__</cite>, <cite>__setitem__</cite>, <cite>__delitem__</cite> and either
<cite>__iter__</cite> or <cite>__contains__</cite>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">Container</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">values</span> <span class="o">=</span> <span class="p">{}</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">values</span><span class="p">[</span><span class="n">name</span><span class="p">]</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">__setitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">values</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">__delitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">values</span><span class="p">[</span><span class="n">name</span><span class="p">]</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">return</span> <span class="nb">iter</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">values</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">thing</span> <span class="o">=</span> <span class="n">Container</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">thing</span><span class="p">[</span><span class="s">&#39;one&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">1</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">dict</span><span class="p">(</span><span class="n">thing</span><span class="p">,</span> <span class="n">one</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">two</span><span class="o">=</span><span class="mi">3</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">thing</span><span class="p">[</span><span class="s">&#39;one&#39;</span><span class="p">]</span> <span class="o">==</span> <span class="mi">2</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">thing</span><span class="p">[</span><span class="s">&#39;two&#39;</span><span class="p">]</span> <span class="o">==</span> <span class="mi">3</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">thing</span><span class="p">[</span><span class="s">&#39;one&#39;</span><span class="p">]</span> <span class="o">==</span> <span class="mi">1</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="nb">list</span><span class="p">(</span><span class="n">thing</span><span class="p">)</span> <span class="o">==</span> <span class="p">[</span><span class="s">&#39;one&#39;</span><span class="p">]</span>
</pre></div>
</div>
</div>
<div class="section" id="patch-multiple">
<h2>patch.multiple<a class="headerlink" href="#patch-multiple" title="Permalink to this headline"></a></h2>
<dl class="function">
<dt id="mock.patch.multiple">
<tt class="descclassname">patch.</tt><tt class="descname">multiple</tt><big>(</big><em>target</em>, <em>spec=None</em>, <em>create=False</em>, <em>spec_set=None</em>, <em>autospec=None</em>, <em>new_callable=None</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#mock.patch.multiple" title="Permalink to this definition"></a></dt>
<dd><p>Perform multiple patches in a single call. It takes the object to be
patched (either as an object or a string to fetch the object by importing)
and keyword arguments for the patches:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">multiple</span><span class="p">(</span><span class="n">settings</span><span class="p">,</span> <span class="n">FIRST_PATCH</span><span class="o">=</span><span class="s">&#39;one&#39;</span><span class="p">,</span> <span class="n">SECOND_PATCH</span><span class="o">=</span><span class="s">&#39;two&#39;</span><span class="p">):</span>
<span class="o">...</span>
</pre></div>
</div>
<p>Use <a class="reference internal" href="sentinel.html#mock.DEFAULT" title="mock.DEFAULT"><tt class="xref py py-data docutils literal"><span class="pre">DEFAULT</span></tt></a> as the value if you want <cite>patch.multiple</cite> to create
mocks for you. In this case the created mocks are passed into a decorated
function by keyword, and a dictionary is returned when <cite>patch.multiple</cite> is
used as a context manager.</p>
<p><cite>patch.multiple</cite> can be used as a decorator, class decorator or a context
manager. The arguments <cite>spec</cite>, <cite>spec_set</cite>, <cite>create</cite>, <cite>autospec</cite> and
<cite>new_callable</cite> have the same meaning as for <cite>patch</cite>. These arguments will
be applied to <em>all</em> patches done by <cite>patch.multiple</cite>.</p>
<p>When used as a class decorator <cite>patch.multiple</cite> honours <cite>patch.TEST_PREFIX</cite>
for choosing which methods to wrap.</p>
</dd></dl>
<p>If you want <cite>patch.multiple</cite> to create mocks for you, then you can use
<a class="reference internal" href="sentinel.html#mock.DEFAULT" title="mock.DEFAULT"><tt class="xref py py-data docutils literal"><span class="pre">DEFAULT</span></tt></a> as the value. If you use <cite>patch.multiple</cite> as a decorator
then the created mocks are passed into the decorated function by keyword.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">thing</span> <span class="o">=</span> <span class="nb">object</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">other</span> <span class="o">=</span> <span class="nb">object</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch.multiple</span><span class="p">(</span><span class="s">&#39;__main__&#39;</span><span class="p">,</span> <span class="n">thing</span><span class="o">=</span><span class="n">DEFAULT</span><span class="p">,</span> <span class="n">other</span><span class="o">=</span><span class="n">DEFAULT</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test_function</span><span class="p">(</span><span class="n">thing</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">thing</span><span class="p">,</span> <span class="n">MagicMock</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">MagicMock</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test_function</span><span class="p">()</span>
</pre></div>
</div>
<p><cite>patch.multiple</cite> can be nested with other <cite>patch</cite> decorators, but put arguments
passed by keyword <em>after</em> any of the standard arguments created by <cite>patch</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;sys.exit&#39;</span><span class="p">)</span>
<span class="gp">... </span><span class="nd">@patch.multiple</span><span class="p">(</span><span class="s">&#39;__main__&#39;</span><span class="p">,</span> <span class="n">thing</span><span class="o">=</span><span class="n">DEFAULT</span><span class="p">,</span> <span class="n">other</span><span class="o">=</span><span class="n">DEFAULT</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test_function</span><span class="p">(</span><span class="n">mock_exit</span><span class="p">,</span> <span class="n">other</span><span class="p">,</span> <span class="n">thing</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="s">&#39;other&#39;</span> <span class="ow">in</span> <span class="nb">repr</span><span class="p">(</span><span class="n">other</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="s">&#39;thing&#39;</span> <span class="ow">in</span> <span class="nb">repr</span><span class="p">(</span><span class="n">thing</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="s">&#39;exit&#39;</span> <span class="ow">in</span> <span class="nb">repr</span><span class="p">(</span><span class="n">mock_exit</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">test_function</span><span class="p">()</span>
</pre></div>
</div>
<p>If <cite>patch.multiple</cite> is used as a context manager, the value returned by the
context manger is a dictionary where created mocks are keyed by name:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">patch</span><span class="o">.</span><span class="n">multiple</span><span class="p">(</span><span class="s">&#39;__main__&#39;</span><span class="p">,</span> <span class="n">thing</span><span class="o">=</span><span class="n">DEFAULT</span><span class="p">,</span> <span class="n">other</span><span class="o">=</span><span class="n">DEFAULT</span><span class="p">)</span> <span class="k">as</span> <span class="n">values</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="s">&#39;other&#39;</span> <span class="ow">in</span> <span class="nb">repr</span><span class="p">(</span><span class="n">values</span><span class="p">[</span><span class="s">&#39;other&#39;</span><span class="p">])</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="s">&#39;thing&#39;</span> <span class="ow">in</span> <span class="nb">repr</span><span class="p">(</span><span class="n">values</span><span class="p">[</span><span class="s">&#39;thing&#39;</span><span class="p">])</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">values</span><span class="p">[</span><span class="s">&#39;thing&#39;</span><span class="p">]</span> <span class="ow">is</span> <span class="n">thing</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">values</span><span class="p">[</span><span class="s">&#39;other&#39;</span><span class="p">]</span> <span class="ow">is</span> <span class="n">other</span>
<span class="gp">...</span>
</pre></div>
</div>
</div>
<div class="section" id="patch-methods-start-and-stop">
<span id="start-and-stop"></span><h2>patch methods: start and stop<a class="headerlink" href="#patch-methods-start-and-stop" title="Permalink to this headline"></a></h2>
<p>All the patchers have <cite>start</cite> and <cite>stop</cite> methods. These make it simpler to do
patching in <cite>setUp</cite> methods or where you want to do multiple patches without
nesting decorators or with statements.</p>
<p>To use them call <cite>patch</cite>, <cite>patch.object</cite> or <cite>patch.dict</cite> as normal and keep a
reference to the returned <cite>patcher</cite> object. You can then call <cite>start</cite> to put
the patch in place and <cite>stop</cite> to undo it.</p>
<p>If you are using <cite>patch</cite> to create a mock for you then it will be returned by
the call to <cite>patcher.start</cite>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">patcher</span> <span class="o">=</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;package.module.ClassName&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">package</span> <span class="kn">import</span> <span class="n">module</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">original</span> <span class="o">=</span> <span class="n">module</span><span class="o">.</span><span class="n">ClassName</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">new_mock</span> <span class="o">=</span> <span class="n">patcher</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">module</span><span class="o">.</span><span class="n">ClassName</span> <span class="ow">is</span> <span class="ow">not</span> <span class="n">original</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">module</span><span class="o">.</span><span class="n">ClassName</span> <span class="ow">is</span> <span class="n">new_mock</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">patcher</span><span class="o">.</span><span class="n">stop</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">module</span><span class="o">.</span><span class="n">ClassName</span> <span class="ow">is</span> <span class="n">original</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">module</span><span class="o">.</span><span class="n">ClassName</span> <span class="ow">is</span> <span class="ow">not</span> <span class="n">new_mock</span>
</pre></div>
</div>
<p>A typical use case for this might be for doing multiple patches in the <cite>setUp</cite>
method of a <cite>TestCase</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">MyTest</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">setUp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">patcher1</span> <span class="o">=</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;package.module.Class1&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">patcher2</span> <span class="o">=</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;package.module.Class2&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">MockClass1</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">patcher1</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">MockClass2</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">patcher2</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">tearDown</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">patcher1</span><span class="o">.</span><span class="n">stop</span><span class="p">()</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">patcher2</span><span class="o">.</span><span class="n">stop</span><span class="p">()</span>
<span class="gp">...</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">test_something</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">package</span><span class="o">.</span><span class="n">module</span><span class="o">.</span><span class="n">Class1</span> <span class="ow">is</span> <span class="bp">self</span><span class="o">.</span><span class="n">MockClass1</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">package</span><span class="o">.</span><span class="n">module</span><span class="o">.</span><span class="n">Class2</span> <span class="ow">is</span> <span class="bp">self</span><span class="o">.</span><span class="n">MockClass2</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MyTest</span><span class="p">(</span><span class="s">&#39;test_something&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
</pre></div>
</div>
<div class="admonition caution">
<p class="first admonition-title">Caution</p>
<p>If you use this technique you must ensure that the patching is &#8220;undone&#8221; by
calling <cite>stop</cite>. This can be fiddlier than you might think, because if an
exception is raised in the setUp then tearDown is not called. <a class="reference external" href="http://pypi.python.org/pypi/unittest2">unittest2</a> cleanup functions make this
easier.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">MyTest</span><span class="p">(</span><span class="n">TestCase</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">setUp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">patcher</span> <span class="o">=</span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;package.module.Class&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">MockClass</span> <span class="o">=</span> <span class="n">patcher</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">addCleanup</span><span class="p">(</span><span class="n">patcher</span><span class="o">.</span><span class="n">stop</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">test_something</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">package</span><span class="o">.</span><span class="n">module</span><span class="o">.</span><span class="n">Class</span> <span class="ow">is</span> <span class="bp">self</span><span class="o">.</span><span class="n">MockClass</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">MyTest</span><span class="p">(</span><span class="s">&#39;test_something&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
</pre></div>
</div>
<p class="last">As an added bonus you no longer need to keep a reference to the <cite>patcher</cite>
object.</p>
</div>
<p>It is also possible to stop all patches which have been started by using
<cite>patch.stopall</cite>.</p>
<dl class="function">
<dt id="mock.patch.stopall">
<tt class="descclassname">patch.</tt><tt class="descname">stopall</tt><big>(</big><big>)</big><a class="headerlink" href="#mock.patch.stopall" title="Permalink to this definition"></a></dt>
<dd><p>Stop all active patches. Only stops patches started with <cite>start</cite>.</p>
</dd></dl>
</div>
<div class="section" id="test-prefix">
<h2>TEST_PREFIX<a class="headerlink" href="#test-prefix" title="Permalink to this headline"></a></h2>
<p>All of the patchers can be used as class decorators. When used in this way
they wrap every test method on the class. The patchers recognise methods that
start with <cite>test</cite> as being test methods. This is the same way that the
<cite>unittest.TestLoader</cite> finds test methods by default.</p>
<p>It is possible that you want to use a different prefix for your tests. You can
inform the patchers of the different prefix by setting <cite>patch.TEST_PREFIX</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">patch</span><span class="o">.</span><span class="n">TEST_PREFIX</span> <span class="o">=</span> <span class="s">&#39;foo&#39;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">value</span> <span class="o">=</span> <span class="mi">3</span>
<span class="go">&gt;&gt;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch</span><span class="p">(</span><span class="s">&#39;__main__.value&#39;</span><span class="p">,</span> <span class="s">&#39;not three&#39;</span><span class="p">)</span>
<span class="gp">... </span><span class="k">class</span> <span class="nc">Thing</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">foo_one</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">print</span> <span class="n">value</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">foo_two</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">print</span> <span class="n">value</span>
<span class="gp">...</span>
<span class="go">&gt;&gt;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">Thing</span><span class="p">()</span><span class="o">.</span><span class="n">foo_one</span><span class="p">()</span>
<span class="go">not three</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">Thing</span><span class="p">()</span><span class="o">.</span><span class="n">foo_two</span><span class="p">()</span>
<span class="go">not three</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">value</span>
<span class="go">3</span>
</pre></div>
</div>
</div>
<div class="section" id="nesting-patch-decorators">
<h2>Nesting Patch Decorators<a class="headerlink" href="#nesting-patch-decorators" title="Permalink to this headline"></a></h2>
<p>If you want to perform multiple patches then you can simply stack up the
decorators.</p>
<p>You can stack up multiple patch decorators using this pattern:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="nd">@patch.object</span><span class="p">(</span><span class="n">SomeClass</span><span class="p">,</span> <span class="s">&#39;class_method&#39;</span><span class="p">)</span>
<span class="gp">... </span><span class="nd">@patch.object</span><span class="p">(</span><span class="n">SomeClass</span><span class="p">,</span> <span class="s">&#39;static_method&#39;</span><span class="p">)</span>
<span class="gp">... </span><span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="n">mock1</span><span class="p">,</span> <span class="n">mock2</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">static_method</span> <span class="ow">is</span> <span class="n">mock1</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">class_method</span> <span class="ow">is</span> <span class="n">mock2</span>
<span class="gp">... </span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">static_method</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">SomeClass</span><span class="o">.</span><span class="n">class_method</span><span class="p">(</span><span class="s">&#39;bar&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">mock1</span><span class="p">,</span> <span class="n">mock2</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock1</span><span class="p">,</span> <span class="n">mock2</span> <span class="o">=</span> <span class="n">test</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock1</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mock2</span><span class="o">.</span><span class="n">assert_called_once_with</span><span class="p">(</span><span class="s">&#39;bar&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>Note that the decorators are applied from the bottom upwards. This is the
standard way that Python applies decorators. The order of the created mocks
passed into your test function matches this order.</p>
<p>Like all context-managers patches can be nested using contextlib&#8217;s nested
function; <em>every</em> patching will appear in the tuple after &#8220;as&#8221;:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">contextlib</span> <span class="kn">import</span> <span class="n">nested</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">with</span> <span class="n">nested</span><span class="p">(</span>
<span class="gp">... </span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;package.module.ClassName1&#39;</span><span class="p">),</span>
<span class="gp">... </span> <span class="n">patch</span><span class="p">(</span><span class="s">&#39;package.module.ClassName2&#39;</span><span class="p">)</span>
<span class="gp">... </span> <span class="p">)</span> <span class="k">as</span> <span class="p">(</span><span class="n">MockClass1</span><span class="p">,</span> <span class="n">MockClass2</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">package</span><span class="o">.</span><span class="n">module</span><span class="o">.</span><span class="n">ClassName1</span> <span class="ow">is</span> <span class="n">MockClass1</span>
<span class="gp">... </span> <span class="k">assert</span> <span class="n">package</span><span class="o">.</span><span class="n">module</span><span class="o">.</span><span class="n">ClassName2</span> <span class="ow">is</span> <span class="n">MockClass2</span>
<span class="gp">...</span>
</pre></div>
</div>
</div>
<div class="section" id="where-to-patch">
<span id="id1"></span><h2>Where to patch<a class="headerlink" href="#where-to-patch" title="Permalink to this headline"></a></h2>
<p><cite>patch</cite> works by (temporarily) changing the object that a <em>name</em> points to with
another one. There can be many names pointing to any individual object, so
for patching to work you must ensure that you patch the name used by the system
under test.</p>
<p>The basic principle is that you patch where an object is <em>looked up</em>, which
is not necessarily the same place as where it is defined. A couple of
examples will help to clarify this.</p>
<p>Imagine we have a project that we want to test with the following structure:</p>
<div class="highlight-python"><pre>a.py
-&gt; Defines SomeClass
b.py
-&gt; from a import SomeClass
-&gt; some_function instantiates SomeClass</pre>
</div>
<p>Now we want to test <cite>some_function</cite> but we want to mock out <cite>SomeClass</cite> using
<cite>patch</cite>. The problem is that when we import module b, which we will have to
do then it imports <cite>SomeClass</cite> from module a. If we use <cite>patch</cite> to mock out
<cite>a.SomeClass</cite> then it will have no effect on our test; module b already has a
reference to the <em>real</em> <cite>SomeClass</cite> and it looks like our patching had no
effect.</p>
<p>The key is to patch out <cite>SomeClass</cite> where it is used (or where it is looked up
). In this case <cite>some_function</cite> will actually look up <cite>SomeClass</cite> in module b,
where we have imported it. The patching should look like:</p>
<blockquote>
<div><cite>&#64;patch(&#8216;b.SomeClass&#8217;)</cite></div></blockquote>
<p>However, consider the alternative scenario where instead of <cite>from a import
SomeClass</cite> module b does <cite>import a</cite> and <cite>some_function</cite> uses <cite>a.SomeClass</cite>. Both
of these import forms are common. In this case the class we want to patch is
being looked up on the a module and so we have to patch <cite>a.SomeClass</cite> instead:</p>
<blockquote>
<div><cite>&#64;patch(&#8216;a.SomeClass&#8217;)</cite></div></blockquote>
</div>
<div class="section" id="patching-descriptors-and-proxy-objects">
<h2>Patching Descriptors and Proxy Objects<a class="headerlink" href="#patching-descriptors-and-proxy-objects" title="Permalink to this headline"></a></h2>
<p>Since version 0.6.0 both <a class="reference internal" href="#patch">patch</a> and <a class="reference internal" href="#patch-object">patch.object</a> have been able to correctly
patch and restore descriptors: class methods, static methods and properties.
You should patch these on the <em>class</em> rather than an instance.</p>
<p>Since version 0.7.0 <a class="reference internal" href="#patch">patch</a> and <a class="reference internal" href="#patch-object">patch.object</a> work correctly with some objects
that proxy attribute access, like the <a class="reference external" href="http://www.voidspace.org.uk/python/weblog/arch_d7_2010_12_04.shtml#e1198">django setttings object</a>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">In django <cite>import settings</cite> and <cite>from django.conf import settings</cite>
return different objects. If you are using libraries / apps that do both you
may have to patch both. Grrr...</p>
</div>
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<ul>
<li><a class="reference internal" href="#">Patch Decorators</a><ul>
<li><a class="reference internal" href="#patch">patch</a></li>
<li><a class="reference internal" href="#patch-object">patch.object</a></li>
<li><a class="reference internal" href="#patch-dict">patch.dict</a></li>
<li><a class="reference internal" href="#patch-multiple">patch.multiple</a></li>
<li><a class="reference internal" href="#patch-methods-start-and-stop">patch methods: start and stop</a></li>
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<li><a class="reference internal" href="#nesting-patch-decorators">Nesting Patch Decorators</a></li>
<li><a class="reference internal" href="#where-to-patch">Where to patch</a></li>
<li><a class="reference internal" href="#patching-descriptors-and-proxy-objects">Patching Descriptors and Proxy Objects</a></li>
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<div class="section" id="sentinel">
<h1>Sentinel<a class="headerlink" href="#sentinel" title="Permalink to this headline"></a></h1>
<dl class="data">
<dt id="mock.sentinel">
<tt class="descname">sentinel</tt><a class="headerlink" href="#mock.sentinel" title="Permalink to this definition"></a></dt>
<dd><p>The <tt class="docutils literal"><span class="pre">sentinel</span></tt> object provides a convenient way of providing unique
objects for your tests.</p>
<p>Attributes are created on demand when you access them by name. Accessing
the same attribute will always return the same object. The objects
returned have a sensible repr so that test failure messages are readable.</p>
</dd></dl>
<dl class="data">
<dt id="mock.DEFAULT">
<tt class="descname">DEFAULT</tt><a class="headerlink" href="#mock.DEFAULT" title="Permalink to this definition"></a></dt>
<dd><p>The <cite>DEFAULT</cite> object is a pre-created sentinel (actually
<cite>sentinel.DEFAULT</cite>). It can be used by <a class="reference internal" href="mock.html#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a>
functions to indicate that the normal return value should be used.</p>
</dd></dl>
<div class="section" id="sentinel-example">
<h2>Sentinel Example<a class="headerlink" href="#sentinel-example" title="Permalink to this headline"></a></h2>
<p>Sometimes when testing you need to test that a specific object is passed as an
argument to another method, or returned. It can be common to create named
sentinel objects to test this. <cite>sentinel</cite> provides a convenient way of
creating and testing the identity of objects like this.</p>
<p>In this example we monkey patch <cite>method</cite> to return
<cite>sentinel.some_object</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">real</span> <span class="o">=</span> <span class="n">ProductionClass</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">method</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&quot;method&quot;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">some_object</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">result</span> <span class="o">=</span> <span class="n">real</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">result</span> <span class="ow">is</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">some_object</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">sentinel</span><span class="o">.</span><span class="n">some_object</span>
<span class="go">sentinel.some_object</span>
</pre></div>
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Metadata-Version: 1.0
Name: mock
Version: 1.0.0
Summary: A Python Mocking and Patching Library for Testing
Home-page: http://www.voidspace.org.uk/python/mock/
Author: Michael Foord
Author-email: michael@voidspace.org.uk
License: UNKNOWN
Description: mock is a library for testing in Python. It allows you to replace parts of
your system under test with mock objects and make assertions about how they
have been used.
mock is now part of the Python standard library, available as `unittest.mock <
http://docs.python.org/py3k/library/unittest.mock.html#module-unittest.mock>`_
in Python 3.3 onwards.
mock provides a core `MagicMock` class removing the need to create a host of
stubs throughout your test suite. After performing an action, you can make
assertions about which methods / attributes were used and arguments they were
called with. You can also specify return values and set needed attributes in
the normal way.
mock is tested on Python versions 2.4-2.7 and Python 3. mock is also tested
with the latest versions of Jython and pypy.
The mock module also provides utility functions / objects to assist with
testing, particularly monkey patching.
* `PDF documentation for 1.0 beta 1
<http://www.voidspace.org.uk/downloads/mock-1.0.0.pdf>`_
* `mock on google code (repository and issue tracker)
<http://code.google.com/p/mock/>`_
* `mock documentation
<http://www.voidspace.org.uk/python/mock/>`_
* `mock on PyPI <http://pypi.python.org/pypi/mock/>`_
* `Mailing list (testing-in-python@lists.idyll.org)
<http://lists.idyll.org/listinfo/testing-in-python>`_
Mock is very easy to use and is designed for use with
`unittest <http://pypi.python.org/pypi/unittest2>`_. Mock is based on
the 'action -> assertion' pattern instead of 'record -> replay' used by many
mocking frameworks. See the `mock documentation`_ for full details.
Mock objects create all attributes and methods as you access them and store
details of how they have been used. You can configure them, to specify return
values or limit what attributes are available, and then make assertions about
how they have been used::
>>> from mock import Mock
>>> real = ProductionClass()
>>> real.method = Mock(return_value=3)
>>> real.method(3, 4, 5, key='value')
3
>>> real.method.assert_called_with(3, 4, 5, key='value')
`side_effect` allows you to perform side effects, return different values or
raise an exception when a mock is called::
>>> mock = Mock(side_effect=KeyError('foo'))
>>> mock()
Traceback (most recent call last):
...
KeyError: 'foo'
>>> values = {'a': 1, 'b': 2, 'c': 3}
>>> def side_effect(arg):
... return values[arg]
...
>>> mock.side_effect = side_effect
>>> mock('a'), mock('b'), mock('c')
(3, 2, 1)
>>> mock.side_effect = [5, 4, 3, 2, 1]
>>> mock(), mock(), mock()
(5, 4, 3)
Mock has many other ways you can configure it and control its behaviour. For
example the `spec` argument configures the mock to take its specification from
another object. Attempting to access attributes or methods on the mock that
don't exist on the spec will fail with an `AttributeError`.
The `patch` decorator / context manager makes it easy to mock classes or
objects in a module under test. The object you specify will be replaced with a
mock (or other object) during the test and restored when the test ends::
>>> from mock import patch
>>> @patch('test_module.ClassName1')
... @patch('test_module.ClassName2')
... def test(MockClass2, MockClass1):
... test_module.ClassName1()
... test_module.ClassName2()
... assert MockClass1.called
... assert MockClass2.called
...
>>> test()
.. note::
When you nest patch decorators the mocks are passed in to the decorated
function in the same order they applied (the normal *python* order that
decorators are applied). This means from the bottom up, so in the example
above the mock for `test_module.ClassName2` is passed in first.
With `patch` it matters that you patch objects in the namespace where they
are looked up. This is normally straightforward, but for a quick guide
read `where to patch
<http://www.voidspace.org.uk/python/mock/patch.html#where-to-patch>`_.
As well as a decorator `patch` can be used as a context manager in a with
statement::
>>> with patch.object(ProductionClass, 'method') as mock_method:
... mock_method.return_value = None
... real = ProductionClass()
... real.method(1, 2, 3)
...
>>> mock_method.assert_called_once_with(1, 2, 3)
There is also `patch.dict` for setting values in a dictionary just during the
scope of a test and restoring the dictionary to its original state when the
test ends::
>>> foo = {'key': 'value'}
>>> original = foo.copy()
>>> with patch.dict(foo, {'newkey': 'newvalue'}, clear=True):
... assert foo == {'newkey': 'newvalue'}
...
>>> assert foo == original
Mock supports the mocking of Python magic methods. The easiest way of
using magic methods is with the `MagicMock` class. It allows you to do
things like::
>>> from mock import MagicMock
>>> mock = MagicMock()
>>> mock.__str__.return_value = 'foobarbaz'
>>> str(mock)
'foobarbaz'
>>> mock.__str__.assert_called_once_with()
Mock allows you to assign functions (or other Mock instances) to magic methods
and they will be called appropriately. The MagicMock class is just a Mock
variant that has all of the magic methods pre-created for you (well - all the
useful ones anyway).
The following is an example of using magic methods with the ordinary Mock
class::
>>> from mock import Mock
>>> mock = Mock()
>>> mock.__str__ = Mock(return_value = 'wheeeeee')
>>> str(mock)
'wheeeeee'
For ensuring that the mock objects your tests use have the same api as the
objects they are replacing, you can use "auto-speccing". Auto-speccing can
be done through the `autospec` argument to patch, or the `create_autospec`
function. Auto-speccing creates mock objects that have the same attributes
and methods as the objects they are replacing, and any functions and methods
(including constructors) have the same call signature as the real object.
This ensures that your mocks will fail in the same way as your production
code if they are used incorrectly::
>>> from mock import create_autospec
>>> def function(a, b, c):
... pass
...
>>> mock_function = create_autospec(function, return_value='fishy')
>>> mock_function(1, 2, 3)
'fishy'
>>> mock_function.assert_called_once_with(1, 2, 3)
>>> mock_function('wrong arguments')
Traceback (most recent call last):
...
TypeError: <lambda>() takes exactly 3 arguments (1 given)
`create_autospec` can also be used on classes, where it copies the signature of
the `__init__` method, and on callable objects where it copies the signature of
the `__call__` method.
The distribution contains tests and documentation. The tests require
`unittest2 <http://pypi.python.org/pypi/unittest2>`_ to run.
Docs from the in-development version of `mock` can be found at
`mock.readthedocs.org <http://mock.readthedocs.org>`_.
Keywords: testing,test,mock,mocking,unittest,patching,stubs,fakes,doubles
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 2.4
Classifier: Programming Language :: Python :: 2.5
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3.1
Classifier: Programming Language :: Python :: 3.2
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Programming Language :: Python :: Implementation :: Jython
Classifier: Operating System :: OS Independent
Classifier: Topic :: Software Development :: Libraries
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Topic :: Software Development :: Testing

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LICENSE.txt
MANIFEST.in
README.txt
mock.py
setup.cfg
setup.py
tox.ini
docs/changelog.txt
docs/compare.txt
docs/conf.py
docs/examples.txt
docs/getting-started.txt
docs/helpers.txt
docs/index.txt
docs/magicmock.txt
docs/mock.txt
docs/patch.txt
docs/sentinel.txt
html/changelog.html
html/compare.html
html/examples.html
html/genindex.html
html/getting-started.html
html/index.html
html/magicmock.html
html/mock.html
html/mocksignature.html
html/objects.inv
html/output.txt
html/patch.html
html/search.html
html/searchindex.js
html/sentinel.html
html/.doctrees/changelog.doctree
html/.doctrees/compare.doctree
html/.doctrees/examples.doctree
html/.doctrees/getting-started.doctree
html/.doctrees/index.doctree
html/.doctrees/magicmock.doctree
html/.doctrees/mock.doctree
html/.doctrees/mocksignature.doctree
html/.doctrees/patch.doctree
html/.doctrees/sentinel.doctree
html/_sources/changelog.txt
html/_sources/compare.txt
html/_sources/examples.txt
html/_sources/getting-started.txt
html/_sources/index.txt
html/_sources/magicmock.txt
html/_sources/mock.txt
html/_sources/mocksignature.txt
html/_sources/patch.txt
html/_sources/sentinel.txt
html/_static/adctheme.css
html/_static/basic.css
html/_static/breadcrumb_background.png
html/_static/default.css
html/_static/doctools.js
html/_static/documentation.png
html/_static/file.png
html/_static/header_sm_mid.png
html/_static/jquery.js
html/_static/minus.png
html/_static/mobile.css
html/_static/plus.png
html/_static/pygments.css
html/_static/scrn1.png
html/_static/scrn2.png
html/_static/searchfield_leftcap.png
html/_static/searchfield_repeat.png
html/_static/searchfield_rightcap.png
html/_static/searchtools.js
html/_static/sidebar.js
html/_static/title_background.png
html/_static/toc.js
html/_static/triangle_closed.png
html/_static/triangle_left.png
html/_static/triangle_open.png
html/_static/underscore.js
mock.egg-info/PKG-INFO
mock.egg-info/SOURCES.txt
mock.egg-info/dependency_links.txt
mock.egg-info/top_level.txt
tests/__init__.py
tests/_testwith.py
tests/support.py
tests/support_with.py
tests/testcallable.py
tests/testhelpers.py
tests/testmagicmethods.py
tests/testmock.py
tests/testpatch.py
tests/testsentinel.py
tests/testwith.py

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[build_sphinx]
source-dir = docs
build-dir = html
[sdist]
force-manifest = 1
[egg_info]
tag_build =
tag_date = 0
tag_svn_revision = 0

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#! /usr/bin/env python
# Copyright (C) 2007-2012 Michael Foord & the mock team
# E-mail: fuzzyman AT voidspace DOT org DOT uk
# http://www.voidspace.org.uk/python/mock/
from mock import __version__
import os
NAME = 'mock'
MODULES = ['mock']
DESCRIPTION = 'A Python Mocking and Patching Library for Testing'
URL = "http://www.voidspace.org.uk/python/mock/"
readme = os.path.join(os.path.dirname(__file__), 'README.txt')
LONG_DESCRIPTION = open(readme).read()
CLASSIFIERS = [
'Development Status :: 5 - Production/Stable',
'Environment :: Console',
'Intended Audience :: Developers',
'License :: OSI Approved :: BSD License',
'Programming Language :: Python',
'Programming Language :: Python :: 2',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 2.4',
'Programming Language :: Python :: 2.5',
'Programming Language :: Python :: 2.6',
'Programming Language :: Python :: 2.7',
'Programming Language :: Python :: 3.1',
'Programming Language :: Python :: 3.2',
'Programming Language :: Python :: Implementation :: CPython',
'Programming Language :: Python :: Implementation :: PyPy',
'Programming Language :: Python :: Implementation :: Jython',
'Operating System :: OS Independent',
'Topic :: Software Development :: Libraries',
'Topic :: Software Development :: Libraries :: Python Modules',
'Topic :: Software Development :: Testing',
]
AUTHOR = 'Michael Foord'
AUTHOR_EMAIL = 'michael@voidspace.org.uk'
KEYWORDS = ("testing test mock mocking unittest patching "
"stubs fakes doubles").split(' ')
params = dict(
name=NAME,
version=__version__,
py_modules=MODULES,
# metadata for upload to PyPI
author=AUTHOR,
author_email=AUTHOR_EMAIL,
description=DESCRIPTION,
long_description=LONG_DESCRIPTION,
keywords=KEYWORDS,
url=URL,
classifiers=CLASSIFIERS,
)
try:
from setuptools import setup
except ImportError:
from distutils.core import setup
else:
params['tests_require'] = ['unittest2']
params['test_suite'] = 'unittest2.collector'
setup(**params)

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# Copyright (C) 2007-2012 Michael Foord & the mock team
# E-mail: fuzzyman AT voidspace DOT org DOT uk
# http://www.voidspace.org.uk/python/mock/

181
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# Copyright (C) 2007-2012 Michael Foord & the mock team
# E-mail: fuzzyman AT voidspace DOT org DOT uk
# http://www.voidspace.org.uk/python/mock/
from __future__ import with_statement
from tests.support import unittest2, is_instance
from mock import MagicMock, Mock, patch, sentinel, mock_open, call
from tests.support_with import catch_warnings, nested
something = sentinel.Something
something_else = sentinel.SomethingElse
class WithTest(unittest2.TestCase):
def test_with_statement(self):
with patch('tests._testwith.something', sentinel.Something2):
self.assertEqual(something, sentinel.Something2, "unpatched")
self.assertEqual(something, sentinel.Something)
def test_with_statement_exception(self):
try:
with patch('tests._testwith.something', sentinel.Something2):
self.assertEqual(something, sentinel.Something2, "unpatched")
raise Exception('pow')
except Exception:
pass
else:
self.fail("patch swallowed exception")
self.assertEqual(something, sentinel.Something)
def test_with_statement_as(self):
with patch('tests._testwith.something') as mock_something:
self.assertEqual(something, mock_something, "unpatched")
self.assertTrue(is_instance(mock_something, MagicMock),
"patching wrong type")
self.assertEqual(something, sentinel.Something)
def test_patch_object_with_statement(self):
class Foo(object):
something = 'foo'
original = Foo.something
with patch.object(Foo, 'something'):
self.assertNotEqual(Foo.something, original, "unpatched")
self.assertEqual(Foo.something, original)
def test_with_statement_nested(self):
with catch_warnings(record=True):
# nested is deprecated in Python 2.7
with nested(patch('tests._testwith.something'),
patch('tests._testwith.something_else')) as (mock_something, mock_something_else):
self.assertEqual(something, mock_something, "unpatched")
self.assertEqual(something_else, mock_something_else,
"unpatched")
self.assertEqual(something, sentinel.Something)
self.assertEqual(something_else, sentinel.SomethingElse)
def test_with_statement_specified(self):
with patch('tests._testwith.something', sentinel.Patched) as mock_something:
self.assertEqual(something, mock_something, "unpatched")
self.assertEqual(mock_something, sentinel.Patched, "wrong patch")
self.assertEqual(something, sentinel.Something)
def testContextManagerMocking(self):
mock = Mock()
mock.__enter__ = Mock()
mock.__exit__ = Mock()
mock.__exit__.return_value = False
with mock as m:
self.assertEqual(m, mock.__enter__.return_value)
mock.__enter__.assert_called_with()
mock.__exit__.assert_called_with(None, None, None)
def test_context_manager_with_magic_mock(self):
mock = MagicMock()
with self.assertRaises(TypeError):
with mock:
'foo' + 3
mock.__enter__.assert_called_with()
self.assertTrue(mock.__exit__.called)
def test_with_statement_same_attribute(self):
with patch('tests._testwith.something', sentinel.Patched) as mock_something:
self.assertEqual(something, mock_something, "unpatched")
with patch('tests._testwith.something') as mock_again:
self.assertEqual(something, mock_again, "unpatched")
self.assertEqual(something, mock_something,
"restored with wrong instance")
self.assertEqual(something, sentinel.Something, "not restored")
def test_with_statement_imbricated(self):
with patch('tests._testwith.something') as mock_something:
self.assertEqual(something, mock_something, "unpatched")
with patch('tests._testwith.something_else') as mock_something_else:
self.assertEqual(something_else, mock_something_else,
"unpatched")
self.assertEqual(something, sentinel.Something)
self.assertEqual(something_else, sentinel.SomethingElse)
def test_dict_context_manager(self):
foo = {}
with patch.dict(foo, {'a': 'b'}):
self.assertEqual(foo, {'a': 'b'})
self.assertEqual(foo, {})
with self.assertRaises(NameError):
with patch.dict(foo, {'a': 'b'}):
self.assertEqual(foo, {'a': 'b'})
raise NameError('Konrad')
self.assertEqual(foo, {})
class TestMockOpen(unittest2.TestCase):
def test_mock_open(self):
mock = mock_open()
with patch('%s.open' % __name__, mock, create=True) as patched:
self.assertIs(patched, mock)
open('foo')
mock.assert_called_once_with('foo')
def test_mock_open_context_manager(self):
mock = mock_open()
handle = mock.return_value
with patch('%s.open' % __name__, mock, create=True):
with open('foo') as f:
f.read()
expected_calls = [call('foo'), call().__enter__(), call().read(),
call().__exit__(None, None, None)]
self.assertEqual(mock.mock_calls, expected_calls)
self.assertIs(f, handle)
def test_explicit_mock(self):
mock = MagicMock()
mock_open(mock)
with patch('%s.open' % __name__, mock, create=True) as patched:
self.assertIs(patched, mock)
open('foo')
mock.assert_called_once_with('foo')
def test_read_data(self):
mock = mock_open(read_data='foo')
with patch('%s.open' % __name__, mock, create=True):
h = open('bar')
result = h.read()
self.assertEqual(result, 'foo')
if __name__ == '__main__':
unittest2.main()

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import sys
info = sys.version_info
if info[:3] >= (3, 2, 0):
# for Python 3.2 ordinary unittest is fine
import unittest as unittest2
else:
import unittest2
try:
callable = callable
except NameError:
def callable(obj):
return hasattr(obj, '__call__')
inPy3k = sys.version_info[0] == 3
with_available = sys.version_info[:2] >= (2, 5)
def is_instance(obj, klass):
"""Version of is_instance that doesn't access __class__"""
return issubclass(type(obj), klass)
class SomeClass(object):
class_attribute = None
def wibble(self):
pass
class X(object):
pass
try:
next = next
except NameError:
def next(obj):
return obj.next()

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from __future__ import with_statement
import sys
__all__ = ['nested', 'catch_warnings', 'examine_warnings']
try:
from contextlib import nested
except ImportError:
from contextlib import contextmanager
@contextmanager
def nested(*managers):
exits = []
vars = []
exc = (None, None, None)
try:
for mgr in managers:
exit = mgr.__exit__
enter = mgr.__enter__
vars.append(enter())
exits.append(exit)
yield vars
except:
exc = sys.exc_info()
finally:
while exits:
exit = exits.pop()
try:
if exit(*exc):
exc = (None, None, None)
except:
exc = sys.exc_info()
if exc != (None, None, None):
raise exc[1]
# copied from Python 2.6
try:
from warnings import catch_warnings
except ImportError:
class catch_warnings(object):
def __init__(self, record=False, module=None):
self._record = record
self._module = sys.modules['warnings']
self._entered = False
def __repr__(self):
args = []
if self._record:
args.append("record=True")
name = type(self).__name__
return "%s(%s)" % (name, ", ".join(args))
def __enter__(self):
if self._entered:
raise RuntimeError("Cannot enter %r twice" % self)
self._entered = True
self._filters = self._module.filters
self._module.filters = self._filters[:]
self._showwarning = self._module.showwarning
if self._record:
log = []
def showwarning(*args, **kwargs):
log.append(WarningMessage(*args, **kwargs))
self._module.showwarning = showwarning
return log
else:
return None
def __exit__(self, *exc_info):
if not self._entered:
raise RuntimeError("Cannot exit %r without entering first" % self)
self._module.filters = self._filters
self._module.showwarning = self._showwarning
class WarningMessage(object):
_WARNING_DETAILS = ("message", "category", "filename", "lineno", "file",
"line")
def __init__(self, message, category, filename, lineno, file=None,
line=None):
local_values = locals()
for attr in self._WARNING_DETAILS:
setattr(self, attr, local_values[attr])
self._category_name = None
if category.__name__:
self._category_name = category.__name__
def examine_warnings(func):
def wrapper():
with catch_warnings(record=True) as ws:
func(ws)
return wrapper

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# Copyright (C) 2007-2012 Michael Foord & the mock team
# E-mail: fuzzyman AT voidspace DOT org DOT uk
# http://www.voidspace.org.uk/python/mock/
from tests.support import is_instance, unittest2, X, SomeClass
from mock import (
Mock, MagicMock, NonCallableMagicMock,
NonCallableMock, patch, create_autospec,
CallableMixin
)
class TestCallable(unittest2.TestCase):
def assertNotCallable(self, mock):
self.assertTrue(is_instance(mock, NonCallableMagicMock))
self.assertFalse(is_instance(mock, CallableMixin))
def test_non_callable(self):
for mock in NonCallableMagicMock(), NonCallableMock():
self.assertRaises(TypeError, mock)
self.assertFalse(hasattr(mock, '__call__'))
self.assertIn(mock.__class__.__name__, repr(mock))
def test_heirarchy(self):
self.assertTrue(issubclass(MagicMock, Mock))
self.assertTrue(issubclass(NonCallableMagicMock, NonCallableMock))
def test_attributes(self):
one = NonCallableMock()
self.assertTrue(issubclass(type(one.one), Mock))
two = NonCallableMagicMock()
self.assertTrue(issubclass(type(two.two), MagicMock))
def test_subclasses(self):
class MockSub(Mock):
pass
one = MockSub()
self.assertTrue(issubclass(type(one.one), MockSub))
class MagicSub(MagicMock):
pass
two = MagicSub()
self.assertTrue(issubclass(type(two.two), MagicSub))
def test_patch_spec(self):
patcher = patch('%s.X' % __name__, spec=True)
mock = patcher.start()
self.addCleanup(patcher.stop)
instance = mock()
mock.assert_called_once_with()
self.assertNotCallable(instance)
self.assertRaises(TypeError, instance)
def test_patch_spec_set(self):
patcher = patch('%s.X' % __name__, spec_set=True)
mock = patcher.start()
self.addCleanup(patcher.stop)
instance = mock()
mock.assert_called_once_with()
self.assertNotCallable(instance)
self.assertRaises(TypeError, instance)
def test_patch_spec_instance(self):
patcher = patch('%s.X' % __name__, spec=X())
mock = patcher.start()
self.addCleanup(patcher.stop)
self.assertNotCallable(mock)
self.assertRaises(TypeError, mock)
def test_patch_spec_set_instance(self):
patcher = patch('%s.X' % __name__, spec_set=X())
mock = patcher.start()
self.addCleanup(patcher.stop)
self.assertNotCallable(mock)
self.assertRaises(TypeError, mock)
def test_patch_spec_callable_class(self):
class CallableX(X):
def __call__(self):
pass
class Sub(CallableX):
pass
class Multi(SomeClass, Sub):
pass
class OldStyle:
def __call__(self):
pass
class OldStyleSub(OldStyle):
pass
for arg in 'spec', 'spec_set':
for Klass in CallableX, Sub, Multi, OldStyle, OldStyleSub:
patcher = patch('%s.X' % __name__, **{arg: Klass})
mock = patcher.start()
try:
instance = mock()
mock.assert_called_once_with()
self.assertTrue(is_instance(instance, MagicMock))
# inherited spec
self.assertRaises(AttributeError, getattr, instance,
'foobarbaz')
result = instance()
# instance is callable, result has no spec
instance.assert_called_once_with()
result(3, 2, 1)
result.assert_called_once_with(3, 2, 1)
result.foo(3, 2, 1)
result.foo.assert_called_once_with(3, 2, 1)
finally:
patcher.stop()
def test_create_autopsec(self):
mock = create_autospec(X)
instance = mock()
self.assertRaises(TypeError, instance)
mock = create_autospec(X())
self.assertRaises(TypeError, mock)
def test_create_autospec_instance(self):
mock = create_autospec(SomeClass, instance=True)
self.assertRaises(TypeError, mock)
mock.wibble()
mock.wibble.assert_called_once_with()
self.assertRaises(TypeError, mock.wibble, 'some', 'args')

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# Copyright (C) 2007-2012 Michael Foord & the mock team
# E-mail: fuzzyman AT voidspace DOT org DOT uk
# http://www.voidspace.org.uk/python/mock/
from tests.support import unittest2, inPy3k
from mock import (
call, _Call, create_autospec, MagicMock,
Mock, ANY, _CallList, patch, PropertyMock
)
from datetime import datetime
class SomeClass(object):
def one(self, a, b):
pass
def two(self):
pass
def three(self, a=None):
pass
class AnyTest(unittest2.TestCase):
def test_any(self):
self.assertEqual(ANY, object())
mock = Mock()
mock(ANY)
mock.assert_called_with(ANY)
mock = Mock()
mock(foo=ANY)
mock.assert_called_with(foo=ANY)
def test_repr(self):
self.assertEqual(repr(ANY), '<ANY>')
self.assertEqual(str(ANY), '<ANY>')
def test_any_and_datetime(self):
mock = Mock()
mock(datetime.now(), foo=datetime.now())
mock.assert_called_with(ANY, foo=ANY)
def test_any_mock_calls_comparison_order(self):
mock = Mock()
d = datetime.now()
class Foo(object):
def __eq__(self, other):
return False
def __ne__(self, other):
return True
for d in datetime.now(), Foo():
mock.reset_mock()
mock(d, foo=d, bar=d)
mock.method(d, zinga=d, alpha=d)
mock().method(a1=d, z99=d)
expected = [
call(ANY, foo=ANY, bar=ANY),
call.method(ANY, zinga=ANY, alpha=ANY),
call(), call().method(a1=ANY, z99=ANY)
]
self.assertEqual(expected, mock.mock_calls)
self.assertEqual(mock.mock_calls, expected)
class CallTest(unittest2.TestCase):
def test_call_with_call(self):
kall = _Call()
self.assertEqual(kall, _Call())
self.assertEqual(kall, _Call(('',)))
self.assertEqual(kall, _Call(((),)))
self.assertEqual(kall, _Call(({},)))
self.assertEqual(kall, _Call(('', ())))
self.assertEqual(kall, _Call(('', {})))
self.assertEqual(kall, _Call(('', (), {})))
self.assertEqual(kall, _Call(('foo',)))
self.assertEqual(kall, _Call(('bar', ())))
self.assertEqual(kall, _Call(('baz', {})))
self.assertEqual(kall, _Call(('spam', (), {})))
kall = _Call(((1, 2, 3),))
self.assertEqual(kall, _Call(((1, 2, 3),)))
self.assertEqual(kall, _Call(('', (1, 2, 3))))
self.assertEqual(kall, _Call(((1, 2, 3), {})))
self.assertEqual(kall, _Call(('', (1, 2, 3), {})))
kall = _Call(((1, 2, 4),))
self.assertNotEqual(kall, _Call(('', (1, 2, 3))))
self.assertNotEqual(kall, _Call(('', (1, 2, 3), {})))
kall = _Call(('foo', (1, 2, 4),))
self.assertNotEqual(kall, _Call(('', (1, 2, 4))))
self.assertNotEqual(kall, _Call(('', (1, 2, 4), {})))
self.assertNotEqual(kall, _Call(('bar', (1, 2, 4))))
self.assertNotEqual(kall, _Call(('bar', (1, 2, 4), {})))
kall = _Call(({'a': 3},))
self.assertEqual(kall, _Call(('', (), {'a': 3})))
self.assertEqual(kall, _Call(('', {'a': 3})))
self.assertEqual(kall, _Call(((), {'a': 3})))
self.assertEqual(kall, _Call(({'a': 3},)))
def test_empty__Call(self):
args = _Call()
self.assertEqual(args, ())
self.assertEqual(args, ('foo',))
self.assertEqual(args, ((),))
self.assertEqual(args, ('foo', ()))
self.assertEqual(args, ('foo',(), {}))
self.assertEqual(args, ('foo', {}))
self.assertEqual(args, ({},))
def test_named_empty_call(self):
args = _Call(('foo', (), {}))
self.assertEqual(args, ('foo',))
self.assertEqual(args, ('foo', ()))
self.assertEqual(args, ('foo',(), {}))
self.assertEqual(args, ('foo', {}))
self.assertNotEqual(args, ((),))
self.assertNotEqual(args, ())
self.assertNotEqual(args, ({},))
self.assertNotEqual(args, ('bar',))
self.assertNotEqual(args, ('bar', ()))
self.assertNotEqual(args, ('bar', {}))
def test_call_with_args(self):
args = _Call(((1, 2, 3), {}))
self.assertEqual(args, ((1, 2, 3),))
self.assertEqual(args, ('foo', (1, 2, 3)))
self.assertEqual(args, ('foo', (1, 2, 3), {}))
self.assertEqual(args, ((1, 2, 3), {}))
def test_named_call_with_args(self):
args = _Call(('foo', (1, 2, 3), {}))
self.assertEqual(args, ('foo', (1, 2, 3)))
self.assertEqual(args, ('foo', (1, 2, 3), {}))
self.assertNotEqual(args, ((1, 2, 3),))
self.assertNotEqual(args, ((1, 2, 3), {}))
def test_call_with_kwargs(self):
args = _Call(((), dict(a=3, b=4)))
self.assertEqual(args, (dict(a=3, b=4),))
self.assertEqual(args, ('foo', dict(a=3, b=4)))
self.assertEqual(args, ('foo', (), dict(a=3, b=4)))
self.assertEqual(args, ((), dict(a=3, b=4)))
def test_named_call_with_kwargs(self):
args = _Call(('foo', (), dict(a=3, b=4)))
self.assertEqual(args, ('foo', dict(a=3, b=4)))
self.assertEqual(args, ('foo', (), dict(a=3, b=4)))
self.assertNotEqual(args, (dict(a=3, b=4),))
self.assertNotEqual(args, ((), dict(a=3, b=4)))
def test_call_with_args_call_empty_name(self):
args = _Call(((1, 2, 3), {}))
self.assertEqual(args, call(1, 2, 3))
self.assertEqual(call(1, 2, 3), args)
self.assertTrue(call(1, 2, 3) in [args])
def test_call_ne(self):
self.assertNotEqual(_Call(((1, 2, 3),)), call(1, 2))
self.assertFalse(_Call(((1, 2, 3),)) != call(1, 2, 3))
self.assertTrue(_Call(((1, 2), {})) != call(1, 2, 3))
def test_call_non_tuples(self):
kall = _Call(((1, 2, 3),))
for value in 1, None, self, int:
self.assertNotEqual(kall, value)
self.assertFalse(kall == value)
def test_repr(self):
self.assertEqual(repr(_Call()), 'call()')
self.assertEqual(repr(_Call(('foo',))), 'call.foo()')
self.assertEqual(repr(_Call(((1, 2, 3), {'a': 'b'}))),
"call(1, 2, 3, a='b')")
self.assertEqual(repr(_Call(('bar', (1, 2, 3), {'a': 'b'}))),
"call.bar(1, 2, 3, a='b')")
self.assertEqual(repr(call), 'call')
self.assertEqual(str(call), 'call')
self.assertEqual(repr(call()), 'call()')
self.assertEqual(repr(call(1)), 'call(1)')
self.assertEqual(repr(call(zz='thing')), "call(zz='thing')")
self.assertEqual(repr(call().foo), 'call().foo')
self.assertEqual(repr(call(1).foo.bar(a=3).bing),
'call().foo.bar().bing')
self.assertEqual(
repr(call().foo(1, 2, a=3)),
"call().foo(1, 2, a=3)"
)
self.assertEqual(repr(call()()), "call()()")
self.assertEqual(repr(call(1)(2)), "call()(2)")
self.assertEqual(
repr(call()().bar().baz.beep(1)),
"call()().bar().baz.beep(1)"
)
def test_call(self):
self.assertEqual(call(), ('', (), {}))
self.assertEqual(call('foo', 'bar', one=3, two=4),
('', ('foo', 'bar'), {'one': 3, 'two': 4}))
mock = Mock()
mock(1, 2, 3)
mock(a=3, b=6)
self.assertEqual(mock.call_args_list,
[call(1, 2, 3), call(a=3, b=6)])
def test_attribute_call(self):
self.assertEqual(call.foo(1), ('foo', (1,), {}))
self.assertEqual(call.bar.baz(fish='eggs'),
('bar.baz', (), {'fish': 'eggs'}))
mock = Mock()
mock.foo(1, 2 ,3)
mock.bar.baz(a=3, b=6)
self.assertEqual(mock.method_calls,
[call.foo(1, 2, 3), call.bar.baz(a=3, b=6)])
def test_extended_call(self):
result = call(1).foo(2).bar(3, a=4)
self.assertEqual(result, ('().foo().bar', (3,), dict(a=4)))
mock = MagicMock()
mock(1, 2, a=3, b=4)
self.assertEqual(mock.call_args, call(1, 2, a=3, b=4))
self.assertNotEqual(mock.call_args, call(1, 2, 3))
self.assertEqual(mock.call_args_list, [call(1, 2, a=3, b=4)])
self.assertEqual(mock.mock_calls, [call(1, 2, a=3, b=4)])
mock = MagicMock()
mock.foo(1).bar()().baz.beep(a=6)
last_call = call.foo(1).bar()().baz.beep(a=6)
self.assertEqual(mock.mock_calls[-1], last_call)
self.assertEqual(mock.mock_calls, last_call.call_list())
def test_call_list(self):
mock = MagicMock()
mock(1)
self.assertEqual(call(1).call_list(), mock.mock_calls)
mock = MagicMock()
mock(1).method(2)
self.assertEqual(call(1).method(2).call_list(),
mock.mock_calls)
mock = MagicMock()
mock(1).method(2)(3)
self.assertEqual(call(1).method(2)(3).call_list(),
mock.mock_calls)
mock = MagicMock()
int(mock(1).method(2)(3).foo.bar.baz(4)(5))
kall = call(1).method(2)(3).foo.bar.baz(4)(5).__int__()
self.assertEqual(kall.call_list(), mock.mock_calls)
def test_call_any(self):
self.assertEqual(call, ANY)
m = MagicMock()
int(m)
self.assertEqual(m.mock_calls, [ANY])
self.assertEqual([ANY], m.mock_calls)
def test_two_args_call(self):
args = _Call(((1, 2), {'a': 3}), two=True)
self.assertEqual(len(args), 2)
self.assertEqual(args[0], (1, 2))
self.assertEqual(args[1], {'a': 3})
other_args = _Call(((1, 2), {'a': 3}))
self.assertEqual(args, other_args)
class SpecSignatureTest(unittest2.TestCase):
def _check_someclass_mock(self, mock):
self.assertRaises(AttributeError, getattr, mock, 'foo')
mock.one(1, 2)
mock.one.assert_called_with(1, 2)
self.assertRaises(AssertionError,
mock.one.assert_called_with, 3, 4)
self.assertRaises(TypeError, mock.one, 1)
mock.two()
mock.two.assert_called_with()
self.assertRaises(AssertionError,
mock.two.assert_called_with, 3)
self.assertRaises(TypeError, mock.two, 1)
mock.three()
mock.three.assert_called_with()
self.assertRaises(AssertionError,
mock.three.assert_called_with, 3)
self.assertRaises(TypeError, mock.three, 3, 2)
mock.three(1)
mock.three.assert_called_with(1)
mock.three(a=1)
mock.three.assert_called_with(a=1)
def test_basic(self):
for spec in (SomeClass, SomeClass()):
mock = create_autospec(spec)
self._check_someclass_mock(mock)
def test_create_autospec_return_value(self):
def f():
pass
mock = create_autospec(f, return_value='foo')
self.assertEqual(mock(), 'foo')
class Foo(object):
pass
mock = create_autospec(Foo, return_value='foo')
self.assertEqual(mock(), 'foo')
def test_autospec_reset_mock(self):
m = create_autospec(int)
int(m)
m.reset_mock()
self.assertEqual(m.__int__.call_count, 0)
def test_mocking_unbound_methods(self):
class Foo(object):
def foo(self, foo):
pass
p = patch.object(Foo, 'foo')
mock_foo = p.start()
Foo().foo(1)
mock_foo.assert_called_with(1)
@unittest2.expectedFailure
def test_create_autospec_unbound_methods(self):
# see issue 128
class Foo(object):
def foo(self):
pass
klass = create_autospec(Foo)
instance = klass()
self.assertRaises(TypeError, instance.foo, 1)
# Note: no type checking on the "self" parameter
klass.foo(1)
klass.foo.assert_called_with(1)
self.assertRaises(TypeError, klass.foo)
def test_create_autospec_keyword_arguments(self):
class Foo(object):
a = 3
m = create_autospec(Foo, a='3')
self.assertEqual(m.a, '3')
@unittest2.skipUnless(inPy3k, "Keyword only arguments Python 3 specific")
def test_create_autospec_keyword_only_arguments(self):
func_def = "def foo(a, *, b=None):\n pass\n"
namespace = {}
exec (func_def, namespace)
foo = namespace['foo']
m = create_autospec(foo)
m(1)
m.assert_called_with(1)
self.assertRaises(TypeError, m, 1, 2)
m(2, b=3)
m.assert_called_with(2, b=3)
def test_function_as_instance_attribute(self):
obj = SomeClass()
def f(a):
pass
obj.f = f
mock = create_autospec(obj)
mock.f('bing')
mock.f.assert_called_with('bing')
def test_spec_as_list(self):
# because spec as a list of strings in the mock constructor means
# something very different we treat a list instance as the type.
mock = create_autospec([])
mock.append('foo')
mock.append.assert_called_with('foo')
self.assertRaises(AttributeError, getattr, mock, 'foo')
class Foo(object):
foo = []
mock = create_autospec(Foo)
mock.foo.append(3)
mock.foo.append.assert_called_with(3)
self.assertRaises(AttributeError, getattr, mock.foo, 'foo')
def test_attributes(self):
class Sub(SomeClass):
attr = SomeClass()
sub_mock = create_autospec(Sub)
for mock in (sub_mock, sub_mock.attr):
self._check_someclass_mock(mock)
def test_builtin_functions_types(self):
# we could replace builtin functions / methods with a function
# with *args / **kwargs signature. Using the builtin method type
# as a spec seems to work fairly well though.
class BuiltinSubclass(list):
def bar(self, arg):
pass
sorted = sorted
attr = {}
mock = create_autospec(BuiltinSubclass)
mock.append(3)
mock.append.assert_called_with(3)
self.assertRaises(AttributeError, getattr, mock.append, 'foo')
mock.bar('foo')
mock.bar.assert_called_with('foo')
self.assertRaises(TypeError, mock.bar, 'foo', 'bar')
self.assertRaises(AttributeError, getattr, mock.bar, 'foo')
mock.sorted([1, 2])
mock.sorted.assert_called_with([1, 2])
self.assertRaises(AttributeError, getattr, mock.sorted, 'foo')
mock.attr.pop(3)
mock.attr.pop.assert_called_with(3)
self.assertRaises(AttributeError, getattr, mock.attr, 'foo')
def test_method_calls(self):
class Sub(SomeClass):
attr = SomeClass()
mock = create_autospec(Sub)
mock.one(1, 2)
mock.two()
mock.three(3)
expected = [call.one(1, 2), call.two(), call.three(3)]
self.assertEqual(mock.method_calls, expected)
mock.attr.one(1, 2)
mock.attr.two()
mock.attr.three(3)
expected.extend(
[call.attr.one(1, 2), call.attr.two(), call.attr.three(3)]
)
self.assertEqual(mock.method_calls, expected)
def test_magic_methods(self):
class BuiltinSubclass(list):
attr = {}
mock = create_autospec(BuiltinSubclass)
self.assertEqual(list(mock), [])
self.assertRaises(TypeError, int, mock)
self.assertRaises(TypeError, int, mock.attr)
self.assertEqual(list(mock), [])
self.assertIsInstance(mock['foo'], MagicMock)
self.assertIsInstance(mock.attr['foo'], MagicMock)
def test_spec_set(self):
class Sub(SomeClass):
attr = SomeClass()
for spec in (Sub, Sub()):
mock = create_autospec(spec, spec_set=True)
self._check_someclass_mock(mock)
self.assertRaises(AttributeError, setattr, mock, 'foo', 'bar')
self.assertRaises(AttributeError, setattr, mock.attr, 'foo', 'bar')
def test_descriptors(self):
class Foo(object):
@classmethod
def f(cls, a, b):
pass
@staticmethod
def g(a, b):
pass
class Bar(Foo):
pass
class Baz(SomeClass, Bar):
pass
for spec in (Foo, Foo(), Bar, Bar(), Baz, Baz()):
mock = create_autospec(spec)
mock.f(1, 2)
mock.f.assert_called_once_with(1, 2)
mock.g(3, 4)
mock.g.assert_called_once_with(3, 4)
@unittest2.skipIf(inPy3k, "No old style classes in Python 3")
def test_old_style_classes(self):
class Foo:
def f(self, a, b):
pass
class Bar(Foo):
g = Foo()
for spec in (Foo, Foo(), Bar, Bar()):
mock = create_autospec(spec)
mock.f(1, 2)
mock.f.assert_called_once_with(1, 2)
self.assertRaises(AttributeError, getattr, mock, 'foo')
self.assertRaises(AttributeError, getattr, mock.f, 'foo')
mock.g.f(1, 2)
mock.g.f.assert_called_once_with(1, 2)
self.assertRaises(AttributeError, getattr, mock.g, 'foo')
def test_recursive(self):
class A(object):
def a(self):
pass
foo = 'foo bar baz'
bar = foo
A.B = A
mock = create_autospec(A)
mock()
self.assertFalse(mock.B.called)
mock.a()
mock.B.a()
self.assertEqual(mock.method_calls, [call.a(), call.B.a()])
self.assertIs(A.foo, A.bar)
self.assertIsNot(mock.foo, mock.bar)
mock.foo.lower()
self.assertRaises(AssertionError, mock.bar.lower.assert_called_with)
def test_spec_inheritance_for_classes(self):
class Foo(object):
def a(self):
pass
class Bar(object):
def f(self):
pass
class_mock = create_autospec(Foo)
self.assertIsNot(class_mock, class_mock())
for this_mock in class_mock, class_mock():
this_mock.a()
this_mock.a.assert_called_with()
self.assertRaises(TypeError, this_mock.a, 'foo')
self.assertRaises(AttributeError, getattr, this_mock, 'b')
instance_mock = create_autospec(Foo())
instance_mock.a()
instance_mock.a.assert_called_with()
self.assertRaises(TypeError, instance_mock.a, 'foo')
self.assertRaises(AttributeError, getattr, instance_mock, 'b')
# The return value isn't isn't callable
self.assertRaises(TypeError, instance_mock)
instance_mock.Bar.f()
instance_mock.Bar.f.assert_called_with()
self.assertRaises(AttributeError, getattr, instance_mock.Bar, 'g')
instance_mock.Bar().f()
instance_mock.Bar().f.assert_called_with()
self.assertRaises(AttributeError, getattr, instance_mock.Bar(), 'g')
def test_inherit(self):
class Foo(object):
a = 3
Foo.Foo = Foo
# class
mock = create_autospec(Foo)
instance = mock()
self.assertRaises(AttributeError, getattr, instance, 'b')
attr_instance = mock.Foo()
self.assertRaises(AttributeError, getattr, attr_instance, 'b')
# instance
mock = create_autospec(Foo())
self.assertRaises(AttributeError, getattr, mock, 'b')
self.assertRaises(TypeError, mock)
# attribute instance
call_result = mock.Foo()
self.assertRaises(AttributeError, getattr, call_result, 'b')
def test_builtins(self):
# used to fail with infinite recursion
create_autospec(1)
create_autospec(int)
create_autospec('foo')
create_autospec(str)
create_autospec({})
create_autospec(dict)
create_autospec([])
create_autospec(list)
create_autospec(set())
create_autospec(set)
create_autospec(1.0)
create_autospec(float)
create_autospec(1j)
create_autospec(complex)
create_autospec(False)
create_autospec(True)
def test_function(self):
def f(a, b):
pass
mock = create_autospec(f)
self.assertRaises(TypeError, mock)
mock(1, 2)
mock.assert_called_with(1, 2)
f.f = f
mock = create_autospec(f)
self.assertRaises(TypeError, mock.f)
mock.f(3, 4)
mock.f.assert_called_with(3, 4)
def test_skip_attributeerrors(self):
class Raiser(object):
def __get__(self, obj, type=None):
if obj is None:
raise AttributeError('Can only be accessed via an instance')
class RaiserClass(object):
raiser = Raiser()
@staticmethod
def existing(a, b):
return a + b
s = create_autospec(RaiserClass)
self.assertRaises(TypeError, lambda x: s.existing(1, 2, 3))
s.existing(1, 2)
self.assertRaises(AttributeError, lambda: s.nonexisting)
# check we can fetch the raiser attribute and it has no spec
obj = s.raiser
obj.foo, obj.bar
def test_signature_class(self):
class Foo(object):
def __init__(self, a, b=3):
pass
mock = create_autospec(Foo)
self.assertRaises(TypeError, mock)
mock(1)
mock.assert_called_once_with(1)
mock(4, 5)
mock.assert_called_with(4, 5)
@unittest2.skipIf(inPy3k, 'no old style classes in Python 3')
def test_signature_old_style_class(self):
class Foo:
def __init__(self, a, b=3):
pass
mock = create_autospec(Foo)
self.assertRaises(TypeError, mock)
mock(1)
mock.assert_called_once_with(1)
mock(4, 5)
mock.assert_called_with(4, 5)
def test_class_with_no_init(self):
# this used to raise an exception
# due to trying to get a signature from object.__init__
class Foo(object):
pass
create_autospec(Foo)
@unittest2.skipIf(inPy3k, 'no old style classes in Python 3')
def test_old_style_class_with_no_init(self):
# this used to raise an exception
# due to Foo.__init__ raising an AttributeError
class Foo:
pass
create_autospec(Foo)
def test_signature_callable(self):
class Callable(object):
def __init__(self):
pass
def __call__(self, a):
pass
mock = create_autospec(Callable)
mock()
mock.assert_called_once_with()
self.assertRaises(TypeError, mock, 'a')
instance = mock()
self.assertRaises(TypeError, instance)
instance(a='a')
instance.assert_called_once_with(a='a')
instance('a')
instance.assert_called_with('a')
mock = create_autospec(Callable())
mock(a='a')
mock.assert_called_once_with(a='a')
self.assertRaises(TypeError, mock)
mock('a')
mock.assert_called_with('a')
def test_signature_noncallable(self):
class NonCallable(object):
def __init__(self):
pass
mock = create_autospec(NonCallable)
instance = mock()
mock.assert_called_once_with()
self.assertRaises(TypeError, mock, 'a')
self.assertRaises(TypeError, instance)
self.assertRaises(TypeError, instance, 'a')
mock = create_autospec(NonCallable())
self.assertRaises(TypeError, mock)
self.assertRaises(TypeError, mock, 'a')
def test_create_autospec_none(self):
class Foo(object):
bar = None
mock = create_autospec(Foo)
none = mock.bar
self.assertNotIsInstance(none, type(None))
none.foo()
none.foo.assert_called_once_with()
def test_autospec_functions_with_self_in_odd_place(self):
class Foo(object):
def f(a, self):
pass
a = create_autospec(Foo)
a.f(self=10)
a.f.assert_called_with(self=10)
def test_autospec_property(self):
class Foo(object):
@property
def foo(self):
return 3
foo = create_autospec(Foo)
mock_property = foo.foo
# no spec on properties
self.assertTrue(isinstance(mock_property, MagicMock))
mock_property(1, 2, 3)
mock_property.abc(4, 5, 6)
mock_property.assert_called_once_with(1, 2, 3)
mock_property.abc.assert_called_once_with(4, 5, 6)
def test_autospec_slots(self):
class Foo(object):
__slots__ = ['a']
foo = create_autospec(Foo)
mock_slot = foo.a
# no spec on slots
mock_slot(1, 2, 3)
mock_slot.abc(4, 5, 6)
mock_slot.assert_called_once_with(1, 2, 3)
mock_slot.abc.assert_called_once_with(4, 5, 6)
class TestCallList(unittest2.TestCase):
def test_args_list_contains_call_list(self):
mock = Mock()
self.assertIsInstance(mock.call_args_list, _CallList)
mock(1, 2)
mock(a=3)
mock(3, 4)
mock(b=6)
for kall in call(1, 2), call(a=3), call(3, 4), call(b=6):
self.assertTrue(kall in mock.call_args_list)
calls = [call(a=3), call(3, 4)]
self.assertTrue(calls in mock.call_args_list)
calls = [call(1, 2), call(a=3)]
self.assertTrue(calls in mock.call_args_list)
calls = [call(3, 4), call(b=6)]
self.assertTrue(calls in mock.call_args_list)
calls = [call(3, 4)]
self.assertTrue(calls in mock.call_args_list)
self.assertFalse(call('fish') in mock.call_args_list)
self.assertFalse([call('fish')] in mock.call_args_list)
def test_call_list_str(self):
mock = Mock()
mock(1, 2)
mock.foo(a=3)
mock.foo.bar().baz('fish', cat='dog')
expected = (
"[call(1, 2),\n"
" call.foo(a=3),\n"
" call.foo.bar(),\n"
" call.foo.bar().baz('fish', cat='dog')]"
)
self.assertEqual(str(mock.mock_calls), expected)
def test_propertymock(self):
p = patch('%s.SomeClass.one' % __name__, new_callable=PropertyMock)
mock = p.start()
try:
SomeClass.one
mock.assert_called_once_with()
s = SomeClass()
s.one
mock.assert_called_with()
self.assertEqual(mock.mock_calls, [call(), call()])
s.one = 3
self.assertEqual(mock.mock_calls, [call(), call(), call(3)])
finally:
p.stop()
def test_propertymock_returnvalue(self):
m = MagicMock()
p = PropertyMock()
type(m).foo = p
returned = m.foo
p.assert_called_once_with()
self.assertIsInstance(returned, MagicMock)
self.assertNotIsInstance(returned, PropertyMock)
if __name__ == '__main__':
unittest2.main()

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third_party/python/mock-1.0.0/tests/testmagicmethods.py поставляемый
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@ -1,486 +0,0 @@
# Copyright (C) 2007-2012 Michael Foord & the mock team
# E-mail: fuzzyman AT voidspace DOT org DOT uk
# http://www.voidspace.org.uk/python/mock/
from tests.support import unittest2, inPy3k
try:
unicode
except NameError:
# Python 3
unicode = str
long = int
import inspect
import sys
from mock import Mock, MagicMock, _magics
class TestMockingMagicMethods(unittest2.TestCase):
def test_deleting_magic_methods(self):
mock = Mock()
self.assertFalse(hasattr(mock, '__getitem__'))
mock.__getitem__ = Mock()
self.assertTrue(hasattr(mock, '__getitem__'))
del mock.__getitem__
self.assertFalse(hasattr(mock, '__getitem__'))
def test_magicmock_del(self):
mock = MagicMock()
# before using getitem
del mock.__getitem__
self.assertRaises(TypeError, lambda: mock['foo'])
mock = MagicMock()
# this time use it first
mock['foo']
del mock.__getitem__
self.assertRaises(TypeError, lambda: mock['foo'])
def test_magic_method_wrapping(self):
mock = Mock()
def f(self, name):
return self, 'fish'
mock.__getitem__ = f
self.assertFalse(mock.__getitem__ is f)
self.assertEqual(mock['foo'], (mock, 'fish'))
self.assertEqual(mock.__getitem__('foo'), (mock, 'fish'))
mock.__getitem__ = mock
self.assertTrue(mock.__getitem__ is mock)
def test_magic_methods_isolated_between_mocks(self):
mock1 = Mock()
mock2 = Mock()
mock1.__iter__ = Mock(return_value=iter([]))
self.assertEqual(list(mock1), [])
self.assertRaises(TypeError, lambda: list(mock2))
def test_repr(self):
mock = Mock()
self.assertEqual(repr(mock), "<Mock id='%s'>" % id(mock))
mock.__repr__ = lambda s: 'foo'
self.assertEqual(repr(mock), 'foo')
def test_str(self):
mock = Mock()
self.assertEqual(str(mock), object.__str__(mock))
mock.__str__ = lambda s: 'foo'
self.assertEqual(str(mock), 'foo')
@unittest2.skipIf(inPy3k, "no unicode in Python 3")
def test_unicode(self):
mock = Mock()
self.assertEqual(unicode(mock), unicode(str(mock)))
mock.__unicode__ = lambda s: unicode('foo')
self.assertEqual(unicode(mock), unicode('foo'))
def test_dict_methods(self):
mock = Mock()
self.assertRaises(TypeError, lambda: mock['foo'])
def _del():
del mock['foo']
def _set():
mock['foo'] = 3
self.assertRaises(TypeError, _del)
self.assertRaises(TypeError, _set)
_dict = {}
def getitem(s, name):
return _dict[name]
def setitem(s, name, value):
_dict[name] = value
def delitem(s, name):
del _dict[name]
mock.__setitem__ = setitem
mock.__getitem__ = getitem
mock.__delitem__ = delitem
self.assertRaises(KeyError, lambda: mock['foo'])
mock['foo'] = 'bar'
self.assertEqual(_dict, {'foo': 'bar'})
self.assertEqual(mock['foo'], 'bar')
del mock['foo']
self.assertEqual(_dict, {})
def test_numeric(self):
original = mock = Mock()
mock.value = 0
self.assertRaises(TypeError, lambda: mock + 3)
def add(self, other):
mock.value += other
return self
mock.__add__ = add
self.assertEqual(mock + 3, mock)
self.assertEqual(mock.value, 3)
del mock.__add__
def iadd(mock):
mock += 3
self.assertRaises(TypeError, iadd, mock)
mock.__iadd__ = add
mock += 6
self.assertEqual(mock, original)
self.assertEqual(mock.value, 9)
self.assertRaises(TypeError, lambda: 3 + mock)
mock.__radd__ = add
self.assertEqual(7 + mock, mock)
self.assertEqual(mock.value, 16)
@unittest2.skipIf(inPy3k, 'no truediv in Python 3')
def test_truediv(self):
mock = MagicMock()
mock.__truediv__.return_value = 6
context = {'mock': mock}
code = 'from __future__ import division\nresult = mock / 7\n'
exec(code, context)
self.assertEqual(context['result'], 6)
mock.__rtruediv__.return_value = 3
code = 'from __future__ import division\nresult = 2 / mock\n'
exec(code, context)
self.assertEqual(context['result'], 3)
@unittest2.skipIf(not inPy3k, 'truediv is available in Python 2')
def test_no_truediv(self):
self.assertRaises(
AttributeError, getattr, MagicMock(), '__truediv__'
)
self.assertRaises(
AttributeError, getattr, MagicMock(), '__rtruediv__'
)
def test_hash(self):
mock = Mock()
# test delegation
self.assertEqual(hash(mock), Mock.__hash__(mock))
def _hash(s):
return 3
mock.__hash__ = _hash
self.assertEqual(hash(mock), 3)
def test_nonzero(self):
m = Mock()
self.assertTrue(bool(m))
nonzero = lambda s: False
if not inPy3k:
m.__nonzero__ = nonzero
else:
m.__bool__ = nonzero
self.assertFalse(bool(m))
def test_comparison(self):
# note: this test fails with Jython 2.5.1 due to a Jython bug
# it is fixed in jython 2.5.2
if not inPy3k:
# incomparable in Python 3
self. assertEqual(Mock() < 3, object() < 3)
self. assertEqual(Mock() > 3, object() > 3)
self. assertEqual(Mock() <= 3, object() <= 3)
self. assertEqual(Mock() >= 3, object() >= 3)
else:
self.assertRaises(TypeError, lambda: MagicMock() < object())
self.assertRaises(TypeError, lambda: object() < MagicMock())
self.assertRaises(TypeError, lambda: MagicMock() < MagicMock())
self.assertRaises(TypeError, lambda: MagicMock() > object())
self.assertRaises(TypeError, lambda: object() > MagicMock())
self.assertRaises(TypeError, lambda: MagicMock() > MagicMock())
self.assertRaises(TypeError, lambda: MagicMock() <= object())
self.assertRaises(TypeError, lambda: object() <= MagicMock())
self.assertRaises(TypeError, lambda: MagicMock() <= MagicMock())
self.assertRaises(TypeError, lambda: MagicMock() >= object())
self.assertRaises(TypeError, lambda: object() >= MagicMock())
self.assertRaises(TypeError, lambda: MagicMock() >= MagicMock())
mock = Mock()
def comp(s, o):
return True
mock.__lt__ = mock.__gt__ = mock.__le__ = mock.__ge__ = comp
self. assertTrue(mock < 3)
self. assertTrue(mock > 3)
self. assertTrue(mock <= 3)
self. assertTrue(mock >= 3)
def test_equality(self):
for mock in Mock(), MagicMock():
self.assertEqual(mock == mock, True)
self.assertIsInstance(mock == mock, bool)
self.assertEqual(mock != mock, False)
self.assertIsInstance(mock != mock, bool)
self.assertEqual(mock == object(), False)
self.assertEqual(mock != object(), True)
def eq(self, other):
return other == 3
mock.__eq__ = eq
self.assertTrue(mock == 3)
self.assertFalse(mock == 4)
def ne(self, other):
return other == 3
mock.__ne__ = ne
self.assertTrue(mock != 3)
self.assertFalse(mock != 4)
mock = MagicMock()
mock.__eq__.return_value = True
self.assertIsInstance(mock == 3, bool)
self.assertEqual(mock == 3, True)
mock.__ne__.return_value = False
self.assertIsInstance(mock != 3, bool)
self.assertEqual(mock != 3, False)
def test_len_contains_iter(self):
mock = Mock()
self.assertRaises(TypeError, len, mock)
self.assertRaises(TypeError, iter, mock)
self.assertRaises(TypeError, lambda: 'foo' in mock)
mock.__len__ = lambda s: 6
self.assertEqual(len(mock), 6)
mock.__contains__ = lambda s, o: o == 3
self.assertTrue(3 in mock)
self.assertFalse(6 in mock)
mock.__iter__ = lambda s: iter('foobarbaz')
self.assertEqual(list(mock), list('foobarbaz'))
def test_magicmock(self):
mock = MagicMock()
mock.__iter__.return_value = iter([1, 2, 3])
self.assertEqual(list(mock), [1, 2, 3])
name = '__nonzero__'
other = '__bool__'
if inPy3k:
name, other = other, name
getattr(mock, name).return_value = False
self.assertFalse(hasattr(mock, other))
self.assertFalse(bool(mock))
for entry in _magics:
self.assertTrue(hasattr(mock, entry))
self.assertFalse(hasattr(mock, '__imaginery__'))
def test_magic_mock_equality(self):
mock = MagicMock()
self.assertIsInstance(mock == object(), bool)
self.assertIsInstance(mock != object(), bool)
self.assertEqual(mock == object(), False)
self.assertEqual(mock != object(), True)
self.assertEqual(mock == mock, True)
self.assertEqual(mock != mock, False)
def test_magicmock_defaults(self):
mock = MagicMock()
self.assertEqual(int(mock), 1)
self.assertEqual(complex(mock), 1j)
self.assertEqual(float(mock), 1.0)
self.assertEqual(long(mock), long(1))
self.assertNotIn(object(), mock)
self.assertEqual(len(mock), 0)
self.assertEqual(list(mock), [])
self.assertEqual(hash(mock), object.__hash__(mock))
self.assertEqual(str(mock), object.__str__(mock))
self.assertEqual(unicode(mock), object.__str__(mock))
self.assertIsInstance(unicode(mock), unicode)
self.assertTrue(bool(mock))
if not inPy3k:
self.assertEqual(oct(mock), '1')
else:
# in Python 3 oct and hex use __index__
# so these tests are for __index__ in py3k
self.assertEqual(oct(mock), '0o1')
self.assertEqual(hex(mock), '0x1')
# how to test __sizeof__ ?
@unittest2.skipIf(inPy3k, "no __cmp__ in Python 3")
def test_non_default_magic_methods(self):
mock = MagicMock()
self.assertRaises(AttributeError, lambda: mock.__cmp__)
mock = Mock()
mock.__cmp__ = lambda s, o: 0
self.assertEqual(mock, object())
def test_magic_methods_and_spec(self):
class Iterable(object):
def __iter__(self):
pass
mock = Mock(spec=Iterable)
self.assertRaises(AttributeError, lambda: mock.__iter__)
mock.__iter__ = Mock(return_value=iter([]))
self.assertEqual(list(mock), [])
class NonIterable(object):
pass
mock = Mock(spec=NonIterable)
self.assertRaises(AttributeError, lambda: mock.__iter__)
def set_int():
mock.__int__ = Mock(return_value=iter([]))
self.assertRaises(AttributeError, set_int)
mock = MagicMock(spec=Iterable)
self.assertEqual(list(mock), [])
self.assertRaises(AttributeError, set_int)
def test_magic_methods_and_spec_set(self):
class Iterable(object):
def __iter__(self):
pass
mock = Mock(spec_set=Iterable)
self.assertRaises(AttributeError, lambda: mock.__iter__)
mock.__iter__ = Mock(return_value=iter([]))
self.assertEqual(list(mock), [])
class NonIterable(object):
pass
mock = Mock(spec_set=NonIterable)
self.assertRaises(AttributeError, lambda: mock.__iter__)
def set_int():
mock.__int__ = Mock(return_value=iter([]))
self.assertRaises(AttributeError, set_int)
mock = MagicMock(spec_set=Iterable)
self.assertEqual(list(mock), [])
self.assertRaises(AttributeError, set_int)
def test_setting_unsupported_magic_method(self):
mock = MagicMock()
def set_setattr():
mock.__setattr__ = lambda self, name: None
self.assertRaisesRegexp(AttributeError,
"Attempting to set unsupported magic method '__setattr__'.",
set_setattr
)
def test_attributes_and_return_value(self):
mock = MagicMock()
attr = mock.foo
def _get_type(obj):
# the type of every mock (or magicmock) is a custom subclass
# so the real type is the second in the mro
return type(obj).__mro__[1]
self.assertEqual(_get_type(attr), MagicMock)
returned = mock()
self.assertEqual(_get_type(returned), MagicMock)
def test_magic_methods_are_magic_mocks(self):
mock = MagicMock()
self.assertIsInstance(mock.__getitem__, MagicMock)
mock[1][2].__getitem__.return_value = 3
self.assertEqual(mock[1][2][3], 3)
def test_magic_method_reset_mock(self):
mock = MagicMock()
str(mock)
self.assertTrue(mock.__str__.called)
mock.reset_mock()
self.assertFalse(mock.__str__.called)
@unittest2.skipUnless(sys.version_info[:2] >= (2, 6),
"__dir__ not available until Python 2.6 or later")
def test_dir(self):
# overriding the default implementation
for mock in Mock(), MagicMock():
def _dir(self):
return ['foo']
mock.__dir__ = _dir
self.assertEqual(dir(mock), ['foo'])
@unittest2.skipIf('PyPy' in sys.version, "This fails differently on pypy")
def test_bound_methods(self):
m = Mock()
# XXXX should this be an expected failure instead?
# this seems like it should work, but is hard to do without introducing
# other api inconsistencies. Failure message could be better though.
m.__iter__ = [3].__iter__
self.assertRaises(TypeError, iter, m)
def test_magic_method_type(self):
class Foo(MagicMock):
pass
foo = Foo()
self.assertIsInstance(foo.__int__, Foo)
def test_descriptor_from_class(self):
m = MagicMock()
type(m).__str__.return_value = 'foo'
self.assertEqual(str(m), 'foo')
def test_iterable_as_iter_return_value(self):
m = MagicMock()
m.__iter__.return_value = [1, 2, 3]
self.assertEqual(list(m), [1, 2, 3])
self.assertEqual(list(m), [1, 2, 3])
m.__iter__.return_value = iter([4, 5, 6])
self.assertEqual(list(m), [4, 5, 6])
self.assertEqual(list(m), [])
if __name__ == '__main__':
unittest2.main()

1351
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third_party/python/mock-1.0.0/tests/testsentinel.py поставляемый
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@ -1,33 +0,0 @@
# Copyright (C) 2007-2012 Michael Foord & the mock team
# E-mail: fuzzyman AT voidspace DOT org DOT uk
# http://www.voidspace.org.uk/python/mock/
from tests.support import unittest2
from mock import sentinel, DEFAULT
class SentinelTest(unittest2.TestCase):
def testSentinels(self):
self.assertEqual(sentinel.whatever, sentinel.whatever,
'sentinel not stored')
self.assertNotEqual(sentinel.whatever, sentinel.whateverelse,
'sentinel should be unique')
def testSentinelName(self):
self.assertEqual(str(sentinel.whatever), 'sentinel.whatever',
'sentinel name incorrect')
def testDEFAULT(self):
self.assertTrue(DEFAULT is sentinel.DEFAULT)
def testBases(self):
# If this doesn't raise an AttributeError then help(mock) is broken
self.assertRaises(AttributeError, lambda: sentinel.__bases__)
if __name__ == '__main__':
unittest2.main()

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@ -1,16 +0,0 @@
import sys
if sys.version_info[:2] >= (2, 5):
from tests._testwith import *
else:
from tests.support import unittest2
class TestWith(unittest2.TestCase):
@unittest2.skip('tests using with statement skipped on Python 2.4')
def testWith(self):
pass
if __name__ == '__main__':
unittest2.main()

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[tox]
envlist = py24,py25,py26,py27,py31,pypy,py32,py33,jython
[testenv]
deps=unittest2
commands={envbindir}/unit2 discover []
[testenv:py26]
commands=
{envbindir}/unit2 discover []
{envbindir}/sphinx-build -E -b doctest docs html
{envbindir}/sphinx-build -E docs html
deps =
unittest2
sphinx
[testenv:py27]
commands=
{envbindir}/unit2 discover []
{envbindir}/sphinx-build -E -b doctest docs html
deps =
unittest2
sphinx
[testenv:py31]
deps =
unittest2py3k
[testenv:py32]
commands=
{envbindir}/python -m unittest discover []
deps =
[testenv:py33]
commands=
{envbindir}/python -m unittest discover []
deps =
# note for jython. Execute in tests directory:
# rm `find . -name '*$py.class'`