The bcltest dir should only have the .ignore files, the code generator
creates all the different projects and those files were left behind when
they should have been removed.
* The info.plist is needed. This was added to issue: https://github.com/xamarin/xamarin-macios/issues/8426
Moved all the code that can be shared with the CLI to the common
library. We neede some small changes, but mainly due to namespaces and a
forgotten interface implemenation (was already implemented, was missing
in the class).
This was fun :)
Refactor TestProject so that we can move all the tasks to the common
assembly. We had to remove all the references from Harness, that
included the MonoNativeInfo.
Something must be different between the virtual screen created in a
headless system in older versions of Mac OS X and 10.15. Everything
works on 10.15 older versions throw an exception.
fixes: https://github.com/xamarin/xamarin-macios/issues/8408
* Rearrange files in Xamarin.Mac a bit to ease code sharing between mmp and
mtouch, by putting mono's static and dynamic libraries in
/Library/Frameworks/Xamarin.Mac.framework/Versions/Current/Sdks/Xamarin.macOS.sdk
to match how Xamarin.iOS does it.
* Don't use 'usr' as an intermediate directory. This removes another special
case.
* Share many of the functions and properties that return specific directories,
and document (as comments) what each function/property is supposed to
return.
* [mtouch] Handle a failure to launch the native linker better by showing better error messages.
dotnet will throw a Win32Exception if the command line is too long, so handle
that scenario. Also handle any other Win32Exceptions and show a better error
message.
* Make MT5217 an error to avoid multiple potentially confusing errors.
The API should be present, yet we have an exception thrown when using
the selector. On 10.15 we do not have issues, so we skip in older
versions. Might be related to the fact that we use headless mac minis.
fixes: https://github.com/xamarin/xamarin-macios/issues/8395
Move all the logic outside and use it as a Composition pattern, later
this class can be used in the CLI so that we share the logic of building
and tested.
In order to de-couple the RunTestTask from Jenkins, create an interface
to be implemented, which is pass to use as a member (Composition
pattern). In order to do that, do not expose Jenkins as a property of
the interface because it is required just by the base constructor.
Moving the the use an interface meant a lot of small changes that
should have no real effect (the compiler should have caught any possible
issues).
Cecil has a fall-back mode where it looks in the GAC / system mono for
assemblies when failing to find them elsewhere. This is not the expected
behavior when using Xamarin.Mac in the Full/XM mode, because then we should
only resolve to assemblies shipped with Xamarin.Mac.
Unfortunately doing so will break apps (our own tests break), so instead
change our resolution to be explicit about where we find assemblies, and if we
find assemblies in the GAC / system mono when we're not supposed to, then show
a warning.
Also add a fall-back mechanism, where we use the old logic instead, in case
the new logic is not 100% compatible with the old one.
This showed up when I tried to port mmp to dotnet, because then Cecil stopped
looking in the GAC / system mono for assemblies (Cecil has a special case when
running on Mono to look in Mono's GAC), and tests started failing.
The initial idea of the refactoring looked nice but as soon as we want
to get the RunTestTask out of jenkins, we have a number of naming
issues. Move the tools to not use the *Task postfix so that it is
cleaner and we can later extra the RunTestTask better.
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
Co-authored-by: Přemek Vysoký <premek.vysoky@microsoft.com>
PR https://github.com/xamarin/xamarin-macios/pull/8184 removed the
inheritance with TextWriter, therefore the `as` will return null and we
will not generate the Html report. In this particular case, we do not
need an ILog, we just use it to get a path to the correct location,
therefore, we can create the file using the full path and pass it to the
xslt.
Fixes: https://github.com/xamarin/xamarin-macios/issues/8364
"msbuild /restore" will run nuget restore, then build. "msbuild /t:Restore"
will just run the Restore target, which should just restore.
This becomes significant when we later try to do "msbuild build", and expect
warnings to show up. If we previously built the project unintentionally, those
warnings won't show up because nothing will actually be built.
Move all the logic outside of the Jenkins namespace. Rework a little the
inheritance to make it nicer in the constructors.
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
Co-authored-by: Přemek Vysoký <premek.vysoky@microsoft.com>
Enabling this will ensure that future bindings (and Xcode updates that
change nullability information) are spotted right away.
The binding fixes are **not** complete, i.e. what was done was mostly
to debug the xtro rule and find corner cases. The backlog will be
_ignored_ so the builds won't fail.
VSMac has failing tests when they query the NSScrees.Screens property
which the following swift code shows that it can be executed in a diff
thread:
```swift
import Cocoa
import AppKit
DispatchQueue.global(qos: .background).async {
print("This is run on the background queue")
print(Thread.current)
var screens = NSScreen.screens
print (screens.count)
}
```
Fixes: https://github.com/xamarin/xamarin-macios/issues/8329
Goals
* Reflect Apple nullability annotations in our bindings using C#8
* No warnings when building bindings
Non-Goals
* Update (add or fix) `[NullAllowed]` to match Apple headers (next phase)
* Make the generator or internal code fully nullable aware (`nowarn` is used)
Notes
* Apple's own annotations are not 100% accurate :(
* Where known issue exists we have _fixed_ our attributes to match reality :)
* We also do additional null-checks internally that might seems not required (better safe than sorry).
Move the task and use composition so that we can reuse the code. This
will later allow other projects to use the class without the need of
Jenkins or Harness and just implement the base class.
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
Co-authored-by: Přemek Vysoký <premek.vysoky@microsoft.com>
The generator project file still needs some custom logic, because we can't put
the generated makefile fragment next to the csproj (that would break the
API/generator diff).
dotnet doesn't like projects within projects in the file system, because of
default inclusion behavior, where the top project will want to include the
source files for the nested projects.
There are ways around that, but the easiest is to just make sure there aren't
projects within other project directories.
There is a difference between mono and .netcore with regards to environment
variables when launching processes.
For the following example:
process.StartInfo.EnvironmentVariables ["FOO"] = null;
.netcore will launch the process with an empty FOO variable, while mono will
launch the process with no FOO variable set.
So unstead remove the variable from the collection of environment variables
(this works fine even if the collection doesn't contain the variable).
Ref: https://github.com/dotnet/runtime/issues/34446
Some of the Jenkins test tasks are very useful and do A LOT of stuff. So
we try to generalize the base class, to later be able to share the most
usebul ones in the shared lib.
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
Threading is hard, part 2. We could have a situation in which two tasks
that are instantiated async use the same id. The id is later used to
build the logs directory etc.. When they share the id we end up in a
situation in which the logs overlap.
fixes: https://github.com/xamarin/xamarin-macios/issues/8146
The testing framework dlls come from mono and their paths are harcoded
in the templates. Move the hardcoded paths out to the assembly locator
which know were to find the paths.
This is needed to later allow the cmd to pass the location of the paths.
The assets were being used from the bcl-test directory. Move them as
part of the template. Renamed a file to make things a little easier when
adding the assets (a '.' in the middle of the name made this
complicated).
The template should be selfcotained.
- Code that will later be moved to the `dotnet/xharness` repo is first moved to an isolated project before it will be extracted to the new repo and NuGetified
- New project for the shared code and new test project for tests accompanying the moved code are created
- Only Factories are left behind that are used only by XHarness
The Generator and the Factory classes are a xamarin-macios thing.
Initially, they were separated because the code that generated the bcl
tests was not inside xharness. That is not longer the case. We can merge
both classes, generalize the namespace and be more prepared to move out
of the xamarin-macios repo.
Threading is hard, even with async. We reached a situation in which the
src code of the test applications from the template was being generated
more than once. Ideally, we could have a nice solution with
AsyncLazy<bool> and use the lazy async to copy the code, but it was
moved to netcore 5. The fix is a little uglier but valid, lock and
enure we only generate it once. Please note that you CANNOT use a lock
statement inside a async method.
Fixes: https://github.com/xamarin/xamarin-macios/issues/8240
Remove two classes that are not really needed and a method. We moved to
named tuples to make things simpler. Unfortunally C# does not support:
```csharp
using MyNamedTuple = (string Name, double value, bool answer);
```
But we have to live with this. Makes the namespace simpler and removes
confusion with the already present project classes that are more widely
used.
* [Harness] Remove the BCLTestProjectInfo class.
The class is not really needed. Move to a tuple, make the definition of
the group test project nicer since the dictionary initiallization makes
it cleaner.
Looks like we have cases in which we get empty nodes when listing
devices, which makes the parsing of the nodes fail and crash.
Move the code to a diff method, try to parse the data, if there is an
exception (missing data) return null. If null is returned, do not add
it.
Fixes: https://github.com/xamarin/xamarin-macios/issues/8160
Looks like mono is not investing much time at the moment fixing
https://github.com/mono/mono/issues/18560
The above error happens always on 32b device tests. Added a new known
failure for the monitoring to use in their task so that they do not have
to goole the issue and they know that is knonw already.
Added a test in the xml parser that verifies that the parsing of the xml
is correct and that the correct number of failures is reported in the
human readable form.
fixes: https://github.com/xamarin/xamarin-macios/issues/8214
Remove two classes that are not really needed and a method. We moved to
named tuples to make things simpler. Unfortunally C# does not support:
```csharp
using MyNamedTuple = (string Name, double value, bool answer);
```
But we have to live with this. Makes the namespace simpler and removes
confusion with the already present project classes that are more widely
used.
Ignore a failing test on devices. Related mono issue: https://github.com/mono/mono/issues/19308
Mono has to fix the issue, so we ignore in the meantime.
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
Refactor result parsing and test it. Make sure that all the possible
corner cases are taken into account. The changes are as follow:
1. Move all the logic to a new class, which will take care of the reustl
parsing.
2. Simplify the parsing method by splitting the noise code to other
functions. There is no need to parse several files in the same method.
3. Add tests that make sure that the correct result is returned when:
a. The app cannot launch.
b. The app timesout.
c. The app crashes.
The _nice_ thing about `NSURLProtocol` is that it does not force the use
of the network - but we inflicted this upon us on tests.
So this updates the test to avoid the network, which should make it
more reliable and not so much influenced by the URL used or the OS
versions where it's executed.
This does not cover as much callback as before. However this it does
test that the NSUrlProtocol is registered correctly (what we care) and
the rest is largely only related the the OS (which is not the target
of our unit tests).
Hopefully fix https://github.com/xamarin/maccore/issues/1956
xcrun can print stuff to stderr even if it succeeds and prints what it found
to stdout, which means we have to separate stdout and stderr when capturing
xcrun's output.
This also means that we need a few changes to our RunCommand API:
* Add support for capturing stdout and stderr separately by providing
different callbacks/StringBuilder instances.
* Use overloads instead of default arguments, because with default arguments
we end up with ambiguous matches in a lot of places with the new overloads.
Fixes https://github.com/xamarin/xamarin-macios/issues/8147.
Backport of #8150.
This is not a complete solution, because it doesn't work when running device
tests, because then we don't build locally. On the other hand, that bug has
never been a problem for device bots, so hopefully that won't change in the
future.
Ref: https://github.com/xamarin/maccore/issues/2177
* [mtouch/mmp] Only use stdout from xcrun as the path of the file that was found. Fixes#8147.
xcrun can print stuff to stderr even if it succeeds and prints what it found
to stdout, which means we have to separate stdout and stderr when capturing
xcrun's output.
This also means that we need a few changes to our RunCommand API:
* Add support for capturing stdout and stderr separately by providing
different callbacks/StringBuilder instances.
* Use overloads instead of default arguments, because with default arguments
we end up with ambiguous matches in a lot of places with the new overloads.
Fixes https://github.com/xamarin/xamarin-macios/issues/8147.
* [tests] Fix mmptest build.
* [mtouch/mmp] Fix process log output.
First step to try and clean up the psring of results and ensure that we
are doing the correct thing. We have several issue there. We want to
move all the complicated logic out of AppRunner and test the different
outputs and the full result matrix.
This commit first allows to use an instance class for the parsing, later
we will move things out. Step by step
XHarness TestAssemblyDefinition is very particular on the way we deal
with the mono test assemblies, in the general case, it only contains the
assembly name, but in the xamarin-macios it calculates the name of the
assembly using the platform.
Create an interface so that the command line was its own implementaiton
and move as much as possible to use the AssemblyLocator class. Later we
can add two simpler implementations for the more general cases.
Move the AssemblyLocator out of the Templates namespace since it makes
more sense.
* Unify target framework code between mtouch and mmp.
* Simplify the code in mmp: have three possible valid target frameworks for
most of code, and add special code to handle setting any other valid target
frameworks to redirect to one of those three valid target frameworks (and
warn if given any of those valid, but not "main", target frameworks). Any
other code can then depend on the target framework having exactly one of
those specific values, which means we can make IsUnified* variables
convenience properties instead.
* Unify a bit more of the argument parsing code between mtouch and mmp, since
that made a few other things easier.
* Add TargetFramework.IsValidFramework to have one validation implementation.
* Move the implementation of TargetFramework.MonoFrameworkDirectory to mmp
itself, it's not really related to the target framework.
* Remove Driver.IsUnified and IsClassic from mmp, they're not used anymore.
* Formally deprecate --xamarin-[full|system]-framework in mmp, they've really been deprecated for many years.
* Remove LinkerOptions.TargetFramework, it's not used anymore.
* Get rid of mmp's userTargetFramework fried, it's duplicated with the
targetFramework field.
* Add a few tests, and tweak others a bit.
Breaking changes:
* Both mtouch and mmp require --target-framework now. The only direct
consumers should be the MSBuild tasks, which already pass --target-framework
all the time. This simplifies code, and removes assumptions.
Initially the location of the test dlls of the downloaded artefact and the compiled mono were different. That was no longer the case and therefore there was a lot of code that could be removed since the wasDownloaded variable was set to be always true.
We remove the not needed code that will calculate a diff path if mono was compiled and use the AssemblyLocator class to point to the correct root path were test dlls will be found.
Co-authored-by: Přemek Vysoký <premek.vysoky@microsoft.com>
At this point the BCLTestProjectGenerator class just represents a configuration class that knows about the project that are particular to xamarin-macios. All the logic that creates the projects has been moved to the XamariniOSTemplate which creates the project using the information passed by the config class.
At this stage, we have the ability to generate test projects by simply passing the info classes, which can be built either by a class (like the generator one) or a command line. We have fully decoupled the project generation from Xharness.
Tests have been added or moved to the correct location.
The name of the tests is picked up in a more inner node than
expected. Fwd the test name to make sure that noe all
crashes/timeouts/launches have the same name.
Add extra information when we have a timeout. We want to know the
name and the bot used to ensure that it is easier to identify patterns.
Timeout tests now have:
test title as: App Timeout {AppName} {Variation} on bot {device_name}
message: AppName} {Variation} Test run timed out after {timeout.TotalMinutes} minute(s) on bot {device_name}.
Build issues now have:
test title: App Build {projectTask.TestName} {projectTask.Variation}
That way we know the exact app that failed to build and the exact app that timeout and the device used to run it.
Move the project templates to be a resource in the dll. That way we can
move all the code outside of xharness and used it outside. This is not a
fill refactor but a first step to decouple the bcl test generation from
the xamarin-macios project.
XHarness should not see a difference, everythign works and simply makes
the dlls larger due to the new resources.
The code is going to take into account that the mono team will want to
use and unmanaged template with no dependencies on Xamarin.iOS and
Xamarin.Mac.
Co-Authored-By: Rolf Bjarne Kvinge <rolf@xamarin.com>
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
Move the project templates to be a resource in the dll. That way we can
move all the code outside of xharness and used it outside. This is not a
fill refactor but a first step to decouple the bcl test generation from
the xamarin-macios project.
XHarness should not see a difference, everythign works and simply makes
the dlls larger due to the new resources.
The code is going to take into account that the mono team will want to
use and unmanaged template with no dependencies on Xamarin.iOS and
Xamarin.Mac.
Add tests for the SimDevice and Simulators classes that ensure that the
process is correctly called and the xml with the simulators parsed and
returns the correct number of sims.
Update the generation of the xml to include a more descriptive title
than "AppCrash". After this commit the name of the testcase and the test
follow this pattern:
- "App Crash {ApplicationName} {Variation}"
This will make it easier to filter since the an example failure will be:
"App Crash Monotouch (Debug)"
Note, the '()' in the example are part of the variation and that is
build by xharness and passed to the runner.
Fixes: https://github.com/xamarin/xamarin-macios/issues/8077
Moved the implementations under Hardare. Add the following to simplify
the testing of the AppRunner:
1. Add interfaces for the listing/loading of devices and simulators.
2. Add a special class for mlaunch args. That way we are sure that
arguments are correctly passed and we do not have typos.
3. Added tests for the new classes and for the device and devices
classes.
4. Added tests for the management of the TCC db.
Tests for the SimDevice and Simulators will come in a following PR. The
only reason for it is that I realize that the commit was getting to
large.
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
Co-authored-by: Přemek Vysoký <premek.vysoky@microsoft.com>
Moved the implementations under Hardware. Add the following to simplify
the testing of the AppRunner:
1. Add interfaces for the listing/loading of devices and simulators.
2. Add a special class for mlaunch args. That way we are sure that
arguments are correctly passed and we do not have typos.
3. Added tests for the new classes and for the device and devices
classes.
4. Added tests for the management of the TCC db.
Tests for the SimDevice and Simulators will come in a following PR. The
only reason for it is that I realize that the commit was getting to
large.
Co-Authored-By: Rolf Bjarne Kvinge <rolf@xamarin.com>
Co-Authored-By: Přemek Vysoký <premek.vysoky@microsoft.com>
Move all the extension methods to a class. After this refactor, we will
be able to DI the manager in the other classes and assert that the
processes are called with the correct parameters without the need of
launching them.
Also added tests for the manager. We create a dummy console app that
will be executed by the tests. The console app has a number of
parameters that will be used to ensure that the new process behaves as
we want:
- Use the passed exit code.
- Create child proecesses if needed.
- Sleep to force a timeout.
- Writer messages to stdout and stderr.
Our tests call the dummy app and ensures that the results match the
behaviour expected by the dummy app.
Co-authored-by: Manuel de la Pena <mandel@microsoft.com>
Co-authored-by: Premek Vysoky <prvysoky@microsoft.com>
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
* [Harness] Refactor process management to be testable.
Move all the extension methods to a class. After this refactor, we will
be able to DI the manager in the other classes and assert that the
processes are called with the correct parameters without the need of
launching them.
Also added tests for the manager. We create a dummy console app that
will be executed by the tests. The console app has a number of
parameters that will be used to ensure that the new process behaves as
we want:
- Use the passed exit code.
- Create child proecesses if needed.
- Sleep to force a timeout.
- Writer messages to stdout and stderr.
Our tests call the dummy app and ensures that the results match the
behaviour expected by the dummy app.
* Apply suggestions from code review
Co-Authored-By: Přemek Vysoký <premek.vysoky@microsoft.com>
* Move out utils into a separate namespace
* Move Cache to the test project
* Fix namespaces after merge
* Remove unneeded code
* Move Target files
* Sort csproj
* Refactor Targets
* Rename Cache to TempDirectory
* Fix using
* Move ProjectFileExtensions
* Remove dead code
* Move Extensions
* Add empty StringUtilsTests
* Add StringUtils tests
* Revert refactorings
* Update tests/xharness/Utilities/StringUtils.cs
Co-Authored-By: Rolf Bjarne Kvinge <rolf@xamarin.com>
* Update tests/xharness/Utilities/StringUtils.cs
Co-Authored-By: Rolf Bjarne Kvinge <rolf@xamarin.com>
* Add better formatarguments test
* Update tests/xharness/Utilities/StringUtils.cs
Co-Authored-By: Rolf Bjarne Kvinge <rolf@xamarin.com>
Co-authored-by: Manuel de la Pena <mandel@microsoft.com>
Co-authored-by: Premek Vysoky <prvysoky@microsoft.com>
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
This also meant adding support for running .NET tests in xharness. Some
refactoring was done to extract common code to shared members, in order to
avoid duplicating a lot of code.
* [mtouch][mmp] Share error.cs and make it safer against FormatException
Beside the obvious code sharing [1] this makes the error reporting code
safer against `FormatException`.
Even with code review this happened a few times in the past - we get
a string that can't format correctly in some error handling code. This
means the `FormatException` must be fixed before we can see the
underlying root issue (delaying bug fixes and support).
Recent changes made for localization makes it harder to review the
original strings (and even harder for translated strings) for
correctness. This means we can end up with something like
```
String.Format ("{0} {1}", "foo");
``
and easily miss it (since they split between different files) if there
are several changes inside a PR.
Finally sprinkle some unit tests :)
[1] we should move everything to use `ProductException` but that will be
for another PR...
Move all the extension methods to a class. After this refactor, we will
be able to DI the manager in the other classes and assert that the
processes are called with the correct parameters without the need of
launching them.
Also added tests for the manager. We create a dummy console app that
will be executed by the tests. The console app has a number of
parameters that will be used to ensure that the new process behaves as
we want:
- Use the passed exit code.
- Create child proecesses if needed.
- Sleep to force a timeout.
- Writer messages to stdout and stderr.
Our tests call the dummy app and ensures that the results match the
behaviour expected by the dummy app.
Co-authored-by: Přemek Vysoký <premek.vysoky@microsoft.com>
Provide tests that will ensure that the Tcp listener and File listener
will work correctly. Tests ensure that both listeners receive the data
and write it in the ILog
The tcp test is an interesting one because it redirects the call of the
method to a diff callback that will write the data in a stream to check
the final result.
This optimization can be enabled when it's not possible to use the
managed linker (e.g. **Don't link**) or when the managed linker cannot
remove references to deprecated types that would cause an application
to be rejected by Apple.
References to the existing types will be renamed, e.g. `UIWebView` to
`DeprecatedWebView`, in every assemblies.
The type definition is also renamed (for validity) and all custom
attributes on the types and their members will be removed.
Code inside the members will be replaced with a
`throw new NotSupportedException ();`.
The msbuild test app `MyReleaseBuild` has been updated to test that the
optimization is working as expected (device builds are slow so reusing
this test has little impact in test time).
Basically the test ensure that `UIWebView` is used and cannot be removed
by the compiler (optimization) or the managed linker (since it's
referenced). Since the optimization is enabled then we can `grep` then
final `.app` directory to ensure there's no mention of `UIWebView` inside
any of the files that would be submitted.
The application can be run, by itself, and will turn green if OK, red if
`DeprecatedWebView` can't be found (skeleton replacement for `UIWebView`)
or orange if a `NotSupportedException` is thrown.
Finally introspection tests have been updated to skip over the deprecated
(and renamed) types. It should not be an issue right now, since this
optimization is not enabled by default, but it made testing easier.
Using this option it's possible to test for the presence of a type
reference in both pre-linked and post-linked assemblies.
This makes it possible to detect if
* a 3rd party assemblies are using some specific type you would like to avoid;
* a type reference has been removed during the build (e.g. linker)
Notes:
* Custom attributes are encoded differently and not included in the assembly type references metadata.
* Assembly that define a type `X` do not have a reference (but the definition) of the type (and won't be reported).
If either the pre or post-linked warnings are not useful then it's possible
to add `-nowarn:150x` to exclude the results.
E.g.
* `-nowarn:1502` would not report references in pre-linked assemblies;
* `-nowarn:1503` would not report references in post-linked assemblies;
Finally `-warnaserror:150x` can be used to stop a build that would not
satisfy either the pre or post-linked condition.
* `-warnaserror:1502` would not report references in pre-linked assemblies;
* `-warnaserror:1503` would not report references in post-linked assemblies;
_side note_ this was first done on `d16-6` to ease backports as `master`
has multiple changes for localization. A similar PR will be done for
`master` once merged.
Move to use interfaces, that will let us later add tests that will
verify that all the correct logging is performed. As an example, added a
test for XmlResultParser that ensures that the failures are correctly
generated. The test uses Moq to pass the different paths to be used and
later be able to verify the wirtten xml.
Co-authored-by: Přemek Vysoký <premek.vysoky@microsoft.com>
so if we optimize (to remove references) the tests will be ignored.
Doing this based on define was wrong since we have different (and more)
configurations executed on devices,
`Default` property was using a nil-handle which is incorrect since
* we don't allow that (this is generally a bad sign)
* it does not map to `OS_LOG_DEFAULT`
Since `Default` was assigned in the type (static) constructor then
the whole type became unusable :(
Header `log.h` shows that the right definition requires us to load a
field and use it.
```
define OS_LOG_DEFAULT OS_OBJECT_GLOBAL_OBJECT(os_log_t, _os_log_default)
```
While `NULL` can actually be used for disabled (not exposed) by this
contradicting (nullability-wise) macro
```
define OS_LOG_DISABLED ((os_log_t _Nonnull)NULL)
```
Also adds unit tests. A more general tests for `.cctor` will be added
to introspection tests in a separate PR.
Fixes https://github.com/xamarin/xamarin-macios/issues/7959
Manuel de la Pena
Rolf Bjarne Kvinge
Sebastien Pouliot
Přemek Vysoký
Alex Soto
Chris Hamons
Whitney Schmidt