ruby/tool/test/testunit/test_minitest_unit.rb

# encoding: utf-8
# frozen_string_literal: false

require 'pathname'
require_relative 'metametameta'

module MyModule; end
class AnError < StandardError; include MyModule; end
class ImmutableString < String; def inspect; super.freeze; end; end

class TestMiniTestUnit < MetaMetaMetaTestCase
  pwd = Pathname.new File.expand_path Dir.pwd
  basedir = Pathname.new(File.expand_path "lib/minitest") + 'mini'
  basedir = basedir.relative_path_from(pwd).to_s
  MINITEST_BASE_DIR = basedir[/\A\./] ? basedir : "./#{basedir}"
  BT_MIDDLE = ["#{MINITEST_BASE_DIR}/test.rb:161:in `each'",
               "#{MINITEST_BASE_DIR}/test.rb:158:in `each'",
               "#{MINITEST_BASE_DIR}/test.rb:139:in `run'",
               "#{MINITEST_BASE_DIR}/test.rb:106:in `run'"]

  def test_class_puke_with_assertion_failed
    exception = Test::Assertion.new "Oh no!"
    exception.set_backtrace ["unhappy"]
    assert_equal 'F', @tu.puke('SomeClass', 'method_name', exception)
    assert_equal 1, @tu.failures
    assert_match(/^Failure.*Oh no!/m, @tu.report.first)
    assert_match("SomeClass#method_name [unhappy]", @tu.report.first)
  end

  def test_class_puke_with_assertion_failed_and_long_backtrace
    bt = (["test/test_some_class.rb:615:in `method_name'",
           "#{MINITEST_BASE_DIR}/unit.rb:140:in `assert_raise'",
           "test/test_some_class.rb:615:in `each'",
           "test/test_some_class.rb:614:in `test_method_name'",
           "#{MINITEST_BASE_DIR}/test.rb:165:in `__send__'"] +
          BT_MIDDLE +
          ["#{MINITEST_BASE_DIR}/test.rb:29"])
    bt = util_expand_bt bt

    ex_location = util_expand_bt(["test/test_some_class.rb:615"]).first

    exception = Test::Assertion.new "Oh no!"
    exception.set_backtrace bt
    assert_equal 'F', @tu.puke('TestSomeClass', 'test_method_name', exception)
    assert_equal 1, @tu.failures
    assert_match(/^Failure.*Oh no!/m, @tu.report.first)
    assert_match("TestSomeClass#test_method_name [#{ex_location}]", @tu.report.first)
  end

  def test_class_puke_with_assertion_failed_and_user_defined_assertions
    bt = (["lib/test/my/util.rb:16:in `another_method_name'",
           "#{MINITEST_BASE_DIR}/unit.rb:140:in `assert_raise'",
           "lib/test/my/util.rb:15:in `block in assert_something'",
           "lib/test/my/util.rb:14:in `each'",
           "lib/test/my/util.rb:14:in `assert_something'",
           "test/test_some_class.rb:615:in `each'",
           "test/test_some_class.rb:614:in `test_method_name'",
           "#{MINITEST_BASE_DIR}/test.rb:165:in `__send__'"] +
          BT_MIDDLE +
          ["#{MINITEST_BASE_DIR}/test.rb:29"])
    bt = util_expand_bt bt

    ex_location = util_expand_bt(["test/test_some_class.rb:615"]).first

    exception = Test::Assertion.new "Oh no!"
    exception.set_backtrace bt
    assert_equal 'F', @tu.puke('TestSomeClass', 'test_method_name', exception)
    assert_equal 1, @tu.failures
    assert_match(/^Failure.*Oh no!/m, @tu.report.first)
    assert_match("TestSomeClass#test_method_name [#{ex_location}]", @tu.report.first)
  end

  def test_class_puke_with_failure_and_flunk_in_backtrace
    exception = begin
                  Test::Unit::TestCase.new('fake tc').flunk
                rescue Test::Assertion => failure
                  failure
                end
    assert_equal 'F', @tu.puke('SomeClass', 'method_name', exception)
    refute @tu.report.any?{|line| line =~ /in .flunk/}
  end

  def test_class_puke_with_flunk_and_user_defined_assertions
    bt = (["lib/test/my/util.rb:16:in `flunk'",
           "#{MINITEST_BASE_DIR}/unit.rb:140:in `assert_raise'",
           "lib/test/my/util.rb:15:in `block in assert_something'",
           "lib/test/my/util.rb:14:in `each'",
           "lib/test/my/util.rb:14:in `assert_something'",
           "test/test_some_class.rb:615:in `each'",
           "test/test_some_class.rb:614:in `test_method_name'",
           "#{MINITEST_BASE_DIR}/test.rb:165:in `__send__'"] +
          BT_MIDDLE +
          ["#{MINITEST_BASE_DIR}/test.rb:29"])
    bt = util_expand_bt bt

    ex_location = util_expand_bt(["test/test_some_class.rb:615"]).first

    exception = Test::Assertion.new "Oh no!"
    exception.set_backtrace bt
    assert_equal 'F', @tu.puke('TestSomeClass', 'test_method_name', exception)
    assert_equal 1, @tu.failures
    assert_match(/^Failure.*Oh no!/m, @tu.report.first)
    assert_match("TestSomeClass#test_method_name [#{ex_location}]", @tu.report.first)
  end

  def test_class_puke_with_non_failure_exception
    exception = Exception.new("Oh no again!")
    assert_equal 'E', @tu.puke('SomeClass', 'method_name', exception)
    assert_equal 1, @tu.errors
    assert_match(/^Exception.*Oh no again!/m, @tu.report.first)
  end

  def test_filter_backtrace
    # this is a semi-lame mix of relative paths.
    # I cheated by making the autotest parts not have ./
    bt = (["lib/autotest.rb:571:in `add_exception'",
           "test/test_autotest.rb:62:in `test_add_exception'",
           "#{MINITEST_BASE_DIR}/test.rb:165:in `__send__'"] +
          BT_MIDDLE +
          ["#{MINITEST_BASE_DIR}/test.rb:29",
           "test/test_autotest.rb:422"])
    bt = util_expand_bt bt

    ex = ["lib/autotest.rb:571:in `add_exception'",
          "test/test_autotest.rb:62:in `test_add_exception'"]
    ex = util_expand_bt ex

    fu = Test::filter_backtrace(bt)

    assert_equal ex, fu
  end

  def test_filter_backtrace_all_unit
    bt = (["#{MINITEST_BASE_DIR}/test.rb:165:in `__send__'"] +
          BT_MIDDLE +
          ["#{MINITEST_BASE_DIR}/test.rb:29"])
    ex = bt.clone
    fu = Test::filter_backtrace(bt)
    assert_equal ex, fu
  end

  def test_filter_backtrace_unit_starts
    bt = (["#{MINITEST_BASE_DIR}/test.rb:165:in `__send__'"] +
          BT_MIDDLE +
          ["#{MINITEST_BASE_DIR}/mini/test.rb:29",
           "-e:1"])

    bt = util_expand_bt bt

    ex = ["-e:1"]
    fu = Test::filter_backtrace bt
    assert_equal ex, fu
  end

  def test_default_runner_is_minitest_unit
    assert_instance_of Test::Unit::Runner, Test::Unit::Runner.runner
  end


  def test_passed_eh_teardown_good
    test_class = Class.new Test::Unit::TestCase do
      def teardown; assert true; end
      def test_omg; assert true; end
    end

    test = test_class.new :test_omg
    test.run @tu
    assert test.passed?
  end

  def test_passed_eh_teardown_skipped
    test_class = Class.new Test::Unit::TestCase do
      def teardown; assert true; end
      def test_omg; skip "bork"; end
    end

    test = test_class.new :test_omg
    test.run @tu
    assert test.passed?
  end

  def test_passed_eh_teardown_flunked
    test_class = Class.new Test::Unit::TestCase do
      def teardown; flunk;       end
      def test_omg; assert true; end
    end

    test = test_class.new :test_omg
    test.run @tu
    refute test.passed?
  end

  def util_expand_bt bt
    bt.map { |f| (f =~ /^\./) ? File.expand_path(f) : f }
  end
end

class TestMiniTestUnitInherited < MetaMetaMetaTestCase
  def with_overridden_include
    Class.class_eval do
      def inherited_with_hacks klass
        throw :inherited_hook
      end

      alias inherited_without_hacks inherited
      alias inherited               inherited_with_hacks
      alias IGNORE_ME!              inherited # 1.8 bug. god I love venture bros
    end

    yield
  ensure
    Class.class_eval do
      alias inherited inherited_without_hacks

      undef_method :inherited_with_hacks
      undef_method :inherited_without_hacks
    end

    refute_respond_to Class, :inherited_with_hacks
    refute_respond_to Class, :inherited_without_hacks
  end

  def test_inherited_hook_plays_nice_with_others
    with_overridden_include do
      assert_throws :inherited_hook do
        Class.new Test::Unit::TestCase
      end
    end
  end
end

class TestMiniTestRunner < MetaMetaMetaTestCase
  # do not parallelize this suite... it just can't handle it.

  def test_class_test_suites
    @assertion_count = 0

    tc = Class.new(Test::Unit::TestCase)

    assert_equal 2, Test::Unit::TestCase.test_suites.size
    assert_equal [tc, Test::Unit::TestCase], Test::Unit::TestCase.test_suites
  end

  def assert_filtering name, expected, a = false
    args = %W[--name #{name} --seed 42]

    alpha = Class.new Test::Unit::TestCase do
      define_method :test_something do
        assert a
      end
    end
    Object.const_set(:Alpha, alpha)

    beta = Class.new Test::Unit::TestCase do
      define_method :test_something do
        assert true
      end
    end
    Object.const_set(:Beta, beta)

    assert_report expected, args
  ensure
    Object.send :remove_const, :Alpha
    Object.send :remove_const, :Beta
  end

  def test_run_with_other_runner
    Test::Unit::Runner.runner = Class.new Test::Unit::Runner do
      def _run_suite suite, type
        suite.before_suite # Run once before each suite
        super suite, type
      end
    end.new

    Class.new Test::Unit::TestCase do
      def self.name; "wacky!" end

      def self.before_suite
        Test::Unit::Runner.output.puts "Running #{self.name} tests"
        @@foo = 1
      end

      def test_something
        assert_equal 1, @@foo
      end

      def test_something_else
        assert_equal 1, @@foo
      end
    end

    expected = clean <<-EOM
      Running wacky! tests
      ..

      Finished tests in 0.00

      2 tests, 2 assertions, 0 failures, 0 errors, 0 skips
    EOM

    assert_report expected
  end

  require 'monitor'

  class Latch
    def initialize count = 1
      @count = count
      @lock  = Monitor.new
      @cv    = @lock.new_cond
    end

    def release
      @lock.synchronize do
        @count -= 1 if @count > 0
        @cv.broadcast if @count == 0
      end
    end

    def await
      @lock.synchronize { @cv.wait_while { @count > 0 } }
    end
  end
end

class TestMiniTestUnitOrder < MetaMetaMetaTestCase
  # do not parallelize this suite... it just can't handle it.

  def test_before_setup
    call_order = []
    Class.new Test::Unit::TestCase do
      define_method :setup do
        super()
        call_order << :setup
      end

      define_method :before_setup do
        call_order << :before_setup
      end

      def test_omg; assert true; end
    end

    with_output do
      @tu.run %w[--seed 42]
    end

    expected = [:before_setup, :setup]
    assert_equal expected, call_order
  end

  def test_after_teardown
    call_order = []
    Class.new Test::Unit::TestCase do
      define_method :teardown do
        super()
        call_order << :teardown
      end

      define_method :after_teardown do
        call_order << :after_teardown
      end

      def test_omg; assert true; end
    end

    with_output do
      @tu.run %w[--seed 42]
    end

    expected = [:teardown, :after_teardown]
    assert_equal expected, call_order
  end

  def test_all_teardowns_are_guaranteed_to_run
    call_order = []
    Class.new Test::Unit::TestCase do
      define_method :after_teardown do
        super()
        call_order << :after_teardown
        raise
      end

      define_method :teardown do
        super()
        call_order << :teardown
        raise
      end

      define_method :before_teardown do
        super()
        call_order << :before_teardown
        raise
      end

      def test_omg; assert true; end
    end

    with_output do
      @tu.run %w[--seed 42]
    end

    expected = [:before_teardown, :teardown, :after_teardown]
    assert_equal expected, call_order
  end

  def test_setup_and_teardown_survive_inheritance
    call_order = []

    parent = Class.new Test::Unit::TestCase do
      define_method :setup do
        call_order << :setup_method
      end

      define_method :teardown do
        call_order << :teardown_method
      end

      define_method :test_something do
        call_order << :test
      end
    end

    _ = Class.new parent

    with_output do
      @tu.run %w[--seed 42]
    end

    # Once for the parent class, once for the child
    expected = [:setup_method, :test, :teardown_method] * 2

    assert_equal expected, call_order
  end
end

class TestMiniTestUnitTestCase < Test::Unit::TestCase
  # do not call parallelize_me! - teardown accesses @tc._assertions
  # which is not threadsafe. Nearly every method in here is an
  # assertion test so it isn't worth splitting it out further.

  RUBY18 = ! defined? Encoding

  def setup
    super

    Test::Unit::TestCase.reset

    @tc = Test::Unit::TestCase.new 'fake tc'
    @zomg = "zomg ponies!"
    @assertion_count = 1
  end

  def teardown
    assert_equal(@assertion_count, @tc._assertions,
                 "expected #{@assertion_count} assertions to be fired during the test, not #{@tc._assertions}") if @tc.passed?
  end

  def non_verbose
    orig_verbose = $VERBOSE
    $VERBOSE = false

    yield
  ensure
    $VERBOSE = orig_verbose
  end

  def test_assert
    @assertion_count = 2

    @tc.assert_equal true, @tc.assert(true), "returns true on success"
  end

  def test_assert__triggered
    util_assert_triggered "Failed assertion, no message given." do
      @tc.assert false
    end
  end

  def test_assert__triggered_message
    util_assert_triggered @zomg do
      @tc.assert false, @zomg
    end
  end

  def test_assert_empty
    @assertion_count = 2

    @tc.assert_empty []
  end

  def test_assert_empty_triggered
    @assertion_count = 2

    util_assert_triggered "Expected [1] to be empty." do
      @tc.assert_empty [1]
    end
  end

  def test_assert_equal
    @tc.assert_equal 1, 1
  end

  def test_assert_equal_different_collection_array_hex_invisible
    object1 = Object.new
    object2 = Object.new
    msg = "No visible difference in the Array#inspect output.
           You should look at the implementation of #== on Array or its members.
           [#<Object:0xXXXXXX>]".gsub(/^ +/, "")
    util_assert_triggered msg do
      @tc.assert_equal [object1], [object2]
    end
  end

  def test_assert_equal_different_collection_hash_hex_invisible
    h1, h2 = {}, {}
    h1[1] = Object.new
    h2[1] = Object.new
    msg = "No visible difference in the Hash#inspect output.
           You should look at the implementation of #== on Hash or its members.
           {1=>#<Object:0xXXXXXX>}".gsub(/^ +/, "")

    util_assert_triggered msg do
      @tc.assert_equal h1, h2
    end
  end

  def test_assert_equal_different_diff_deactivated
    skip "https://github.com/MagLev/maglev/issues/209" if maglev?

    without_diff do
      util_assert_triggered util_msg("haha" * 10, "blah" * 10) do
        o1 = "haha" * 10
        o2 = "blah" * 10

        @tc.assert_equal o1, o2
      end
    end
  end

  def test_assert_equal_different_hex
    c = Class.new do
      def initialize s; @name = s; end
    end

    o1 = c.new "a"
    o2 = c.new "b"
    msg = "--- expected
           +++ actual
           @@ -1 +1 @@
           -#<#<Class:0xXXXXXX>:0xXXXXXX @name=\"a\">
           +#<#<Class:0xXXXXXX>:0xXXXXXX @name=\"b\">
           ".gsub(/^ +/, "")

    util_assert_triggered msg do
      @tc.assert_equal o1, o2
    end
  end

  def test_assert_equal_different_hex_invisible
    o1 = Object.new
    o2 = Object.new

    msg = "No visible difference in the Object#inspect output.
           You should look at the implementation of #== on Object or its members.
           #<Object:0xXXXXXX>".gsub(/^ +/, "")

    util_assert_triggered msg do
      @tc.assert_equal o1, o2
    end
  end

  def test_assert_equal_different_long
    msg = "<\"hahahahahahahahahahahahahahahahahahahaha\"> expected but was
           <\"blahblahblahblahblahblahblahblahblahblah\">.".gsub(/^ +/, "")

    util_assert_triggered msg do
      o1 = "haha" * 10
      o2 = "blah" * 10

      @tc.assert_equal o1, o2
    end
  end

  def test_assert_equal_different_long_invisible
    msg = "<\"blahblahblahblahblahblahblahblahblahblah\"> (UTF-8) expected but was
           <\"blahblahblahblahblahblahblahblahblahblah\"> (UTF-8).".gsub(/^ +/, "")

    util_assert_triggered msg do
      o1 = "blah" * 10
      o2 = "blah" * 10
      def o1.== o
        false
      end
      @tc.assert_equal o1, o2
    end
  end

  def test_assert_equal_different_long_msg
    msg = "message.
           <\"hahahahahahahahahahahahahahahahahahahaha\"> expected but was
           <\"blahblahblahblahblahblahblahblahblahblah\">.".gsub(/^ +/, "")

    util_assert_triggered msg do
      o1 = "haha" * 10
      o2 = "blah" * 10
      @tc.assert_equal o1, o2, "message"
    end
  end

  def test_assert_equal_different_short
    util_assert_triggered util_msg(1, 2) do
      @tc.assert_equal 1, 2
    end
  end

  def test_assert_equal_different_short_msg
    util_assert_triggered util_msg(1, 2, "message") do
      @tc.assert_equal 1, 2, "message"
    end
  end

  def test_assert_equal_different_short_multiline
    msg = "--- expected\n+++ actual\n@@ -1,2 +1,2 @@\n \"a\n-b\"\n+c\"\n"
    util_assert_triggered msg do
      @tc.assert_equal "a\nb", "a\nc"
    end
  end

  def test_assert_equal_different_escaped_newline
    msg = "--- expected\n+++ actual\n@@ -1,2 +1,2 @@\n \"xxx\n-a\\\\nb\"\n+a\\\\nc\"\n"
    util_assert_triggered msg do
      @tc.assert_equal "xxx\na\\nb", "xxx\na\\nc"
    end
  end

  def test_assert_in_delta
    @tc.assert_in_delta 0.0, 1.0 / 1000, 0.1
  end

  def test_delta_consistency
    @tc.assert_in_delta 0, 1, 1

    util_assert_triggered "Expected |0 - 1| (1) to not be <= 1." do
      @tc.refute_in_delta 0, 1, 1
    end
  end

  def test_assert_in_delta_triggered
    x = maglev? ? "9.999999xxxe-07" : "1.0e-06"
    util_assert_triggered "Expected |0.0 - 0.001| (0.001) to be <= #{x}." do
      @tc.assert_in_delta 0.0, 1.0 / 1000, 0.000001
    end
  end

  def test_assert_in_epsilon
    @assertion_count = 10

    @tc.assert_in_epsilon 10000, 9991
    @tc.assert_in_epsilon 9991, 10000
    @tc.assert_in_epsilon 1.0, 1.001
    @tc.assert_in_epsilon 1.001, 1.0

    @tc.assert_in_epsilon 10000, 9999.1, 0.0001
    @tc.assert_in_epsilon 9999.1, 10000, 0.0001
    @tc.assert_in_epsilon 1.0, 1.0001, 0.0001
    @tc.assert_in_epsilon 1.0001, 1.0, 0.0001

    @tc.assert_in_epsilon(-1, -1)
    @tc.assert_in_epsilon(-10000, -9991)
  end

  def test_epsilon_consistency
    @tc.assert_in_epsilon 1.0, 1.001

    msg = "Expected |1.0 - 1.001| (0.000999xxx) to not be <= 0.001."
    util_assert_triggered msg do
      @tc.refute_in_epsilon 1.0, 1.001
    end
  end

  def test_assert_in_epsilon_triggered
    util_assert_triggered 'Expected |10000 - 9990| (10) to be <= 9.99.' do
      @tc.assert_in_epsilon 10000, 9990
    end
  end

  def test_assert_in_epsilon_triggered_negative_case
    x = (RUBY18 and not maglev?) ? "0.1" : "0.100000xxx"
    y = maglev? ? "0.100000xxx" : "0.1"
    util_assert_triggered "Expected |-1.1 - -1| (#{x}) to be <= #{y}." do
      @tc.assert_in_epsilon(-1.1, -1, 0.1)
    end
  end

  def test_assert_includes
    @assertion_count = 2

    @tc.assert_includes [true], true
  end

  def test_assert_includes_triggered
    @assertion_count = 3

    e = @tc.assert_raise Test::Assertion do
      @tc.assert_includes [true], false
    end

    expected = "Expected [true] to include false."
    assert_equal expected, e.message
  end

  def test_assert_instance_of
    @tc.assert_instance_of String, "blah"
  end

  def test_assert_instance_of_triggered
    util_assert_triggered 'Expected "blah" to be an instance of Array, not String.' do
      @tc.assert_instance_of Array, "blah"
    end
  end

  def test_assert_kind_of
    @tc.assert_kind_of String, "blah"
  end

  def test_assert_kind_of_triggered
    util_assert_triggered 'Expected "blah" to be a kind of Array, not String.' do
      @tc.assert_kind_of Array, "blah"
    end
  end

  def test_assert_match
    @assertion_count = 2
    @tc.assert_match(/\w+/, "blah blah blah")
  end

  def test_assert_match_matcher_object
    @assertion_count = 2

    pattern = Object.new
    def pattern.=~(other) true end

    @tc.assert_match pattern, 5
  end

  def test_assert_match_matchee_to_str
    @assertion_count = 2

    obj = Object.new
    def obj.to_str; "blah" end

    @tc.assert_match "blah", obj
  end

  def test_assert_match_object_triggered
    @assertion_count = 2

    pattern = Object.new
    def pattern.=~(other) false end
    def pattern.inspect; "[Object]" end

    util_assert_triggered 'Expected [Object] to match 5.' do
      @tc.assert_match pattern, 5
    end
  end

  def test_assert_match_triggered
    @assertion_count = 2
    util_assert_triggered 'Expected /\d+/ to match "blah blah blah".' do
      @tc.assert_match(/\d+/, "blah blah blah")
    end
  end

  def test_assert_nil
    @tc.assert_nil nil
  end

  def test_assert_nil_triggered
    util_assert_triggered 'Expected 42 to be nil.' do
      @tc.assert_nil 42
    end
  end

  def test_assert_operator
    @tc.assert_operator 2, :>, 1
  end

  def test_assert_operator_bad_object
    bad = Object.new
    def bad.==(other) true end

    @tc.assert_operator bad, :equal?, bad
  end

  def test_assert_operator_triggered
    util_assert_triggered "Expected 2 to be < 1." do
      @tc.assert_operator 2, :<, 1
    end
  end

  def test_assert_output_both
    @assertion_count = 2

    @tc.assert_output "yay", "blah" do
      print "yay"
      $stderr.print "blah"
    end
  end

  def test_assert_output_both_regexps
    @assertion_count = 4

    @tc.assert_output(/y.y/, /bl.h/) do
      print "yay"
      $stderr.print "blah"
    end
  end

  def test_assert_output_err
    @tc.assert_output nil, "blah" do
      $stderr.print "blah"
    end
  end

  def test_assert_output_neither
    @assertion_count = 0

    @tc.assert_output do
      # do nothing
    end
  end

  def test_assert_output_out
    @tc.assert_output "blah" do
      print "blah"
    end
  end

  def test_assert_output_triggered_both
    util_assert_triggered util_msg("blah", "blah blah", "In stderr") do
      @tc.assert_output "yay", "blah" do
        print "boo"
        $stderr.print "blah blah"
      end
    end
  end

  def test_assert_output_triggered_err
    util_assert_triggered util_msg("blah", "blah blah", "In stderr") do
      @tc.assert_output nil, "blah" do
        $stderr.print "blah blah"
      end
    end
  end

  def test_assert_output_triggered_out
    util_assert_triggered util_msg("blah", "blah blah", "In stdout") do
      @tc.assert_output "blah" do
        print "blah blah"
      end
    end
  end

  def test_assert_predicate
    @tc.assert_predicate "", :empty?
  end

  def test_assert_predicate_triggered
    util_assert_triggered 'Expected "blah" to be empty?.' do
      @tc.assert_predicate "blah", :empty?
    end
  end

  def test_assert_raise
    @tc.assert_raise RuntimeError do
      raise "blah"
    end
  end

  def test_assert_raise_module
    @tc.assert_raise MyModule do
      raise AnError
    end
  end

  ##
  # *sigh* This is quite an odd scenario, but it is from real (albeit
  # ugly) test code in ruby-core:
  #
  # https://github.com/ruby/ruby/commit/6bab4ea9917dc05cd2c94aead2e96eb7df7d4be1

  def test_assert_raise_skip
    @assertion_count = 0

    util_assert_triggered "skipped", Test::Skip do
      @tc.assert_raise ArgumentError do
        begin
          raise "blah"
        rescue
          skip "skipped"
        end
      end
    end
  end

  def test_assert_raise_triggered_different
    e = assert_raise Test::Assertion do
      @tc.assert_raise RuntimeError do
        raise SyntaxError, "icky"
      end
    end

    expected = clean <<-EOM.chomp
      [RuntimeError] exception expected, not #<SyntaxError: icky>.
    EOM

    actual = e.message.gsub(/^.+:\d+/, 'FILE:LINE')
    actual.gsub!(/block \(\d+ levels\) in /, '') if RUBY_VERSION >= '1.9.0'

    assert_equal expected, actual
  end

  def test_assert_raise_triggered_different_msg
    e = assert_raise Test::Assertion do
      @tc.assert_raise RuntimeError, "XXX" do
        raise SyntaxError, "icky"
      end
    end

    expected = clean <<-EOM
      XXX.
      [RuntimeError] exception expected, not #<SyntaxError: icky>.
    EOM

    actual = e.message.gsub(/^.+:\d+/, 'FILE:LINE')
    actual.gsub!(/block \(\d+ levels\) in /, '') if RUBY_VERSION >= '1.9.0'

    assert_equal expected.chomp, actual
  end

  def test_assert_raise_triggered_none
    e = assert_raise Test::Assertion do
      @tc.assert_raise Test::Assertion do
        # do nothing
      end
    end

    expected = "Test::Assertion expected but nothing was raised."

    assert_equal expected, e.message
  end

  def test_assert_raise_triggered_none_msg
    e = assert_raise Test::Assertion do
      @tc.assert_raise Test::Assertion, "XXX" do
        # do nothing
      end
    end

    expected = "XXX.\nTest::Assertion expected but nothing was raised."

    assert_equal expected, e.message
  end

  def test_assert_raise_triggered_subclass
    e = assert_raise Test::Assertion do
      @tc.assert_raise StandardError do
        raise AnError
      end
    end

    expected = clean <<-EOM.chomp
      [StandardError] exception expected, not #<AnError: AnError>.
    EOM

    actual = e.message.gsub(/^.+:\d+/, 'FILE:LINE')
    actual.gsub!(/block \(\d+ levels\) in /, '') if RUBY_VERSION >= '1.9.0'

    assert_equal expected, actual
  end

  def test_assert_respond_to
    @tc.assert_respond_to "blah", :empty?
  end

  def test_assert_respond_to_triggered
    util_assert_triggered 'Expected "blah" (String) to respond to #rawr!.' do
      @tc.assert_respond_to "blah", :rawr!
    end
  end

  def test_assert_same
    @assertion_count = 3

    o = "blah"
    @tc.assert_same 1, 1
    @tc.assert_same :blah, :blah
    @tc.assert_same o, o
  end

  def test_assert_same_triggered
    @assertion_count = 2

    util_assert_triggered 'Expected 2 (oid=N) to be the same as 1 (oid=N).' do
      @tc.assert_same 1, 2
    end

    s1 = "blah"
    s2 = "blah"

    util_assert_triggered 'Expected "blah" (oid=N) to be the same as "blah" (oid=N).' do
      @tc.assert_same s1, s2
    end
  end

  def test_assert_send
    @tc.assert_send [1, :<, 2]
  end

  def test_assert_send_bad
    util_assert_triggered "Expected 1.>(2) to return true." do
      @tc.assert_send [1, :>, 2]
    end
  end

  def test_assert_silent
    @assertion_count = 2

    @tc.assert_silent do
      # do nothing
    end
  end

  def test_assert_silent_triggered_err
    util_assert_triggered util_msg("", "blah blah", "In stderr") do
      @tc.assert_silent do
        $stderr.print "blah blah"
      end
    end
  end

  def test_assert_silent_triggered_out
    @assertion_count = 2

    util_assert_triggered util_msg("", "blah blah", "In stdout") do
      @tc.assert_silent do
        print "blah blah"
      end
    end
  end

  def test_assert_throws
    @tc.assert_throws :blah do
      throw :blah
    end
  end

  def test_assert_throws_different
    util_assert_triggered 'Expected :blah to have been thrown, not :not_blah.' do
      @tc.assert_throws :blah do
        throw :not_blah
      end
    end
  end

  def test_assert_throws_unthrown
    util_assert_triggered 'Expected :blah to have been thrown.' do
      @tc.assert_throws :blah do
        # do nothing
      end
    end
  end

  def test_capture_io
    @assertion_count = 0

    non_verbose do
      out, err = capture_io do
        puts 'hi'
        $stderr.puts 'bye!'
      end

      assert_equal "hi\n", out
      assert_equal "bye!\n", err
    end
  end

  def test_capture_subprocess_io
    @assertion_count = 0

    non_verbose do
      out, err = capture_subprocess_io do
        system("echo", "hi")
        system("echo", "bye!", out: :err)
      end

      assert_equal "hi\n", out
      assert_equal "bye!\n", err
    end
  end

  def test_flunk
    util_assert_triggered 'Epic Fail!' do
      @tc.flunk
    end
  end

  def test_flunk_message
    util_assert_triggered @zomg do
      @tc.flunk @zomg
    end
  end

  def test_message
    @assertion_count = 0

    assert_equal "blah2.",         @tc.message          { "blah2" }.call
    assert_equal "blah2.",         @tc.message("")      { "blah2" }.call
    assert_equal "blah1.\nblah2.", @tc.message(:blah1)  { "blah2" }.call
    assert_equal "blah1.\nblah2.", @tc.message("blah1") { "blah2" }.call

    message = proc { "blah1" }
    assert_equal "blah1.\nblah2.", @tc.message(message) { "blah2" }.call

    message = @tc.message { "blah1" }
    assert_equal "blah1.\nblah2.", @tc.message(message) { "blah2" }.call
  end

  def test_message_message
    util_assert_triggered "whoops.\n<1> expected but was\n<2>." do
      @tc.assert_equal 1, 2, message { "whoops" }
    end
  end

  def test_message_lambda
    util_assert_triggered "whoops.\n<1> expected but was\n<2>." do
      @tc.assert_equal 1, 2, lambda { "whoops" }
    end
  end

  def test_message_deferred
    @assertion_count, var = 0, nil

    msg = message { var = "blah" }

    assert_nil var

    msg.call

    assert_equal "blah", var
  end

  def test_pass
    @tc.pass
  end

  def test_prints
    printer = Class.new { extend Test::Unit::Assertions }
    @tc.assert_equal '"test"', printer.mu_pp(ImmutableString.new 'test')
  end

  def test_refute
    @assertion_count = 2

    @tc.assert_equal false, @tc.refute(false), "returns false on success"
  end

  def test_refute_empty
    @assertion_count = 2

    @tc.refute_empty [1]
  end

  def test_refute_empty_triggered
    @assertion_count = 2

    util_assert_triggered "Expected [] to not be empty." do
      @tc.refute_empty []
    end
  end

  def test_refute_equal
    @tc.refute_equal "blah", "yay"
  end

  def test_refute_equal_triggered
    util_assert_triggered 'Expected "blah" to not be equal to "blah".' do
      @tc.refute_equal "blah", "blah"
    end
  end

  def test_refute_in_delta
    @tc.refute_in_delta 0.0, 1.0 / 1000, 0.000001
  end

  def test_refute_in_delta_triggered
    x = maglev? ? "0.100000xxx" : "0.1"
    util_assert_triggered "Expected |0.0 - 0.001| (0.001) to not be <= #{x}." do
      @tc.refute_in_delta 0.0, 1.0 / 1000, 0.1
    end
  end

  def test_refute_in_epsilon
    @tc.refute_in_epsilon 10000, 9990-1
  end

  def test_refute_in_epsilon_triggered
    util_assert_triggered 'Expected |10000 - 9990| (10) to not be <= 10.0.' do
      @tc.refute_in_epsilon 10000, 9990
      fail
    end
  end

  def test_refute_includes
    @assertion_count = 2

    @tc.refute_includes [true], false
  end

  def test_refute_includes_triggered
    @assertion_count = 3

    e = @tc.assert_raise Test::Assertion do
      @tc.refute_includes [true], true
    end

    expected = "Expected [true] to not include true."
    assert_equal expected, e.message
  end

  def test_refute_instance_of
    @tc.refute_instance_of Array, "blah"
  end

  def test_refute_instance_of_triggered
    util_assert_triggered 'Expected "blah" to not be an instance of String.' do
      @tc.refute_instance_of String, "blah"
    end
  end

  def test_refute_kind_of
    @tc.refute_kind_of Array, "blah"
  end

  def test_refute_kind_of_triggered
    util_assert_triggered 'Expected "blah" to not be a kind of String.' do
      @tc.refute_kind_of String, "blah"
    end
  end

  def test_refute_match
    @assertion_count = 2
    @tc.refute_match(/\d+/, "blah blah blah")
  end

  def test_refute_match_matcher_object
    @assertion_count = 2
    non_verbose do
      obj = Object.new
      def obj.=~(other); false; end
      @tc.refute_match obj, 5
    end
  end

  def test_refute_match_object_triggered
    @assertion_count = 2

    pattern = Object.new
    def pattern.=~(other) true end
    def pattern.inspect; "[Object]" end

    util_assert_triggered 'Expected [Object] to not match 5.' do
      @tc.refute_match pattern, 5
    end
  end

  def test_refute_match_triggered
    @assertion_count = 2
    util_assert_triggered 'Expected /\w+/ to not match "blah blah blah".' do
      @tc.refute_match(/\w+/, "blah blah blah")
    end
  end

  def test_refute_nil
    @tc.refute_nil 42
  end

  def test_refute_nil_triggered
    util_assert_triggered 'Expected nil to not be nil.' do
      @tc.refute_nil nil
    end
  end

  def test_refute_predicate
    @tc.refute_predicate "42", :empty?
  end

  def test_refute_predicate_triggered
    util_assert_triggered 'Expected "" to not be empty?.' do
      @tc.refute_predicate "", :empty?
    end
  end

  def test_refute_operator
    @tc.refute_operator 2, :<, 1
  end

  def test_refute_operator_bad_object
    bad = Object.new
    def bad.==(other) true end

    @tc.refute_operator true, :equal?, bad
  end

  def test_refute_operator_triggered
    util_assert_triggered "Expected 2 to not be > 1." do
      @tc.refute_operator 2, :>, 1
    end
  end

  def test_refute_respond_to
    @tc.refute_respond_to "blah", :rawr!
  end

  def test_refute_respond_to_triggered
    util_assert_triggered 'Expected "blah" to not respond to empty?.' do
      @tc.refute_respond_to "blah", :empty?
    end
  end

  def test_refute_same
    @tc.refute_same 1, 2
  end

  def test_refute_same_triggered
    util_assert_triggered 'Expected 1 (oid=N) to not be the same as 1 (oid=N).' do
      @tc.refute_same 1, 1
    end
  end

  def test_skip
    @assertion_count = 0

    util_assert_triggered "haha!", Test::Skip do
      @tc.skip "haha!"
    end
  end

  def test_test_methods_random
    @assertion_count = 0

    sample_test_case = Class.new Test::Unit::TestCase do
      def self.test_order; :random; end
      def test_test1; assert "does not matter" end
      def test_test2; assert "does not matter" end
      def test_test3; assert "does not matter" end
      @test_order = [1, 0, 2]
      def self.rand(n) @test_order.shift; end
    end

    expected = %w(test_test2 test_test1 test_test3)
    assert_equal expected, sample_test_case.test_methods
  end

  def test_test_methods_sorted
    @assertion_count = 0

    sample_test_case = Class.new Test::Unit::TestCase do
      def self.test_order; :sorted end
      def test_test3; assert "does not matter" end
      def test_test2; assert "does not matter" end
      def test_test1; assert "does not matter" end
    end

    expected = %w(test_test1 test_test2 test_test3)
    assert_equal expected, sample_test_case.test_methods
  end

  def assert_triggered expected, klass = Test::Assertion
    e = assert_raise klass do
      yield
    end

    msg = e.message.sub(/(---Backtrace---).*/m, '\1')
    msg.gsub!(/\(oid=[-0-9]+\)/, '(oid=N)')
    msg.gsub!(/(\d\.\d{6})\d+/, '\1xxx') # normalize: ruby version, impl, platform

    assert_equal expected, msg
  end
  alias util_assert_triggered assert_triggered

  def util_msg exp, act, msg = nil
    s = "<#{exp.inspect}> expected but was\n<#{act.inspect}>."
    s = "#{msg}.\n#{s}" if msg
    s
  end

  def without_diff
    old_diff = Test::Unit::Assertions.diff
    Test::Unit::Assertions.diff = nil

    yield
  ensure
    Test::Unit::Assertions.diff = old_diff
  end
end

class TestMiniTestGuard < Test::Unit::TestCase
  def test_mri_eh
    assert self.class.mri? "ruby blah"
    assert self.mri? "ruby blah"
  end

  def test_jruby_eh
    assert self.class.jruby? "java"
    assert self.jruby? "java"
  end

  def test_rubinius_eh
    assert self.class.rubinius? "rbx"
    assert self.rubinius? "rbx"
  end

  def test_windows_eh
    assert self.class.windows? "mswin"
    assert self.windows? "mswin"
  end
end

class TestMiniTestUnitRecording < MetaMetaMetaTestCase
  # do not parallelize this suite... it just can't handle it.

  def assert_run_record(*expected, &block)
    def @tu.record suite, method, assertions, time, error
      recording[method] << error
    end

    def @tu.recording
      @recording ||= Hash.new { |h,k| h[k] = [] }
    end

    Test::Unit::Runner.runner = @tu

    Class.new Test::Unit::TestCase, &block

    with_output do
      @tu.run
    end

    recorded = @tu.recording.fetch("test_method").map(&:class)

    assert_equal expected, recorded
  end

  def test_record_passing
    assert_run_record NilClass do
      def test_method
        assert true
      end
    end
  end

  def test_record_failing
    assert_run_record Test::Assertion do
      def test_method
        assert false
      end
    end
  end

  def test_record_error
    assert_run_record RuntimeError do
      def test_method
        raise "unhandled exception"
      end
    end
  end

  def test_record_error_teardown
    assert_run_record NilClass, RuntimeError do
      def test_method
        assert true
      end

      def teardown
        raise "unhandled exception"
      end
    end
  end

  def test_record_error_in_test_and_teardown
    assert_run_record AnError, RuntimeError do
      def test_method
        raise AnError
      end

      def teardown
        raise "unhandled exception"
      end
    end
  end

  def test_record_skip
    assert_run_record Test::Skip do
      def test_method
        skip "not yet"
      end
    end
  end
end