Avoid defining the same test class in multiple files

Should fix issues with parallel testing sometimes not running all
tests.

This should be viewed skipping whitespace changes.

Fixes [Bug #18731]

test/-ext-/bignum/test_big2str.rb

@@ -2,8 +2,7 @@
 require 'test/unit'
 require "-test-/bignum"
 
-class Test_Bignum < Test::Unit::TestCase
+class TestBignum_Big2str < Test::Unit::TestCase
-  class TestBig2str < Test::Unit::TestCase
 
   SIZEOF_BDIGIT = Bug::Bignum::SIZEOF_BDIGIT
   BITSPERDIG = Bug::Bignum::BITSPERDIG
@@ -26,5 +25,4 @@ class Test_Bignum < Test::Unit::TestCase
   rescue NotImplementedError
   end
 
-  end
 end

test/-ext-/bignum/test_bigzero.rb

@@ -2,8 +2,7 @@
 require 'test/unit'
 require "-test-/bignum"
 
-class Test_Bignum < Test::Unit::TestCase
+class TestBignum_BigZero < Test::Unit::TestCase
-  class TestBigZero < Test::Unit::TestCase
   def test_equal_0
     bug8204 = '[ruby-core:53893] [Bug #8204]'
     (0..10).each do |i|
@@ -16,5 +15,4 @@ class Test_Bignum < Test::Unit::TestCase
       assert_equal(true, Bug::Bignum.zero(i).zero?)
     end
   end
-  end
 end

test/-ext-/bignum/test_div.rb

@@ -2,8 +2,7 @@
 require 'test/unit'
 require "-test-/bignum"
 
-class Test_Bignum < Test::Unit::TestCase
+class TestBignum_Div < Test::Unit::TestCase
-  class TestDiv < Test::Unit::TestCase
 
   SIZEOF_BDIGIT = Bug::Bignum::SIZEOF_BDIGIT
   BITSPERDIG = Bug::Bignum::BITSPERDIG
@@ -25,5 +24,4 @@ class Test_Bignum < Test::Unit::TestCase
     assert_equal([q, r], Bug::Bignum.big_divrem_gmp(x, y))
   rescue NotImplementedError
   end
-  end
 end

test/-ext-/bignum/test_mul.rb

@@ -2,8 +2,7 @@
 require 'test/unit'
 require "-test-/bignum"
 
-class Test_Bignum < Test::Unit::TestCase
+class TestBignum_Mul < Test::Unit::TestCase
-  class TestMul < Test::Unit::TestCase
 
   SIZEOF_BDIGIT = Bug::Bignum::SIZEOF_BDIGIT
   BITSPERDIG = Bug::Bignum::BITSPERDIG
@@ -134,5 +133,4 @@ class Test_Bignum < Test::Unit::TestCase
   rescue NotImplementedError
   end
 
-  end
 end

test/-ext-/bignum/test_pack.rb

@@ -4,8 +4,7 @@
 require 'test/unit'
 require "-test-/bignum"
 
-class Test_Bignum < Test::Unit::TestCase
+class TestBignum_Pack < Test::Unit::TestCase
-  class TestPack < Test::Unit::TestCase
 
   MSWORD_FIRST = Bug::Bignum::INTEGER_PACK_MSWORD_FIRST
   LSWORD_FIRST = Bug::Bignum::INTEGER_PACK_LSWORD_FIRST
@@ -346,7 +345,6 @@ class Test_Bignum < Test::Unit::TestCase
                   "Bug::Bignum.test_unpack(#{str.dump}, #{n}, 1, 0, #{'%#x' % flags})")
     }
   end
-  end
 
   def test_numbits_2comp
     assert_equal(4, Bug::Bignum.test_numbits_2comp_without_sign(-9))
@@ -395,5 +393,4 @@ class Test_Bignum < Test::Unit::TestCase
     assert_equal(5, Bug::Bignum.test_numbytes_2comp_with_sign(0x7fffffffff))
     assert_equal(6, Bug::Bignum.test_numbytes_2comp_with_sign(0x8000000000))
   end
-
 end

test/-ext-/bignum/test_str2big.rb

@@ -2,8 +2,7 @@
 require 'test/unit'
 require "-test-/bignum"
 
-class Test_Bignum < Test::Unit::TestCase
+class TestBignum_Str2big < Test::Unit::TestCase
-  class TestStr2big < Test::Unit::TestCase
 
   SIZEOF_BDIGIT = Bug::Bignum::SIZEOF_BDIGIT
   BITSPERDIG = Bug::Bignum::BITSPERDIG
@@ -34,5 +33,4 @@ class Test_Bignum < Test::Unit::TestCase
   rescue NotImplementedError
   end
 
-  end
 end

test/-ext-/funcall/test_funcall.rb

@@ -1,11 +0,0 @@
-# frozen_string_literal: true
-require 'test/unit'
-
-class TestFuncall < Test::Unit::TestCase
-  require '-test-/funcall'
-
-  def test_funcall_extra_args
-    assert_equal 'TestFuncall', TestFuncall.extra_args_name,
-	 '[ruby-core:85266] [Bug #14425]'
-  end
-end

test/-ext-/funcall/test_passing_block.rb

@@ -9,6 +9,11 @@ class TestFuncall < Test::Unit::TestCase
   end
   require '-test-/funcall'
 
+  def test_funcall_extra_args
+    assert_equal 'TestFuncall', TestFuncall.extra_args_name,
+	 '[ruby-core:85266] [Bug #14425]'
+  end
+
   def test_with_funcall2
     ok = nil
     Relay.with_funcall2("feature#4504") {|arg| ok = arg || true}

test/date/test_date_ractor.rb

@@ -2,7 +2,7 @@
 require 'test/unit'
 require 'date'
 
-class TestDateParse < Test::Unit::TestCase
+class TestDateParseRactor < Test::Unit::TestCase
   def code(klass = Date, share: false)
     <<~RUBY.gsub('Date', klass.name)
       share = #{share}

test/fileutils/clobber.rb

@@ -4,10 +4,7 @@ require 'test/unit'
 require 'tmpdir'
 require_relative 'fileasserts'
 
-class TestFileUtils < Test::Unit::TestCase
+module TestFileUtilsClobber
-end
-
-module TestFileUtils::Clobber
   include Test::Unit::FileAssertions
 
   def my_rm_rf(path)

test/fileutils/test_dryrun.rb

@@ -8,7 +8,7 @@ require_relative 'visibility_tests'
 class TestFileUtilsDryRun < Test::Unit::TestCase
 
   include FileUtils::DryRun
-  include TestFileUtilsInc::Visibility
+  include TestFileUtilsIncVisibility
 
   def setup
     super

test/fileutils/test_nowrite.rb

@@ -8,7 +8,7 @@ require_relative 'visibility_tests'
 class TestFileUtilsNoWrite < Test::Unit::TestCase
 
   include FileUtils::NoWrite
-  include TestFileUtilsInc::Visibility
+  include TestFileUtilsIncVisibility
 
   def setup
     super

test/fileutils/test_verbose.rb

@@ -8,7 +8,7 @@ require_relative 'visibility_tests'
 class TestFileUtilsVerbose < Test::Unit::TestCase
 
   include FileUtils::Verbose
-  include TestFileUtilsInc::Visibility
+  include TestFileUtilsIncVisibility
 
   def setup
     super

test/fileutils/visibility_tests.rb

@@ -2,14 +2,11 @@
 require 'test/unit'
 require 'fileutils'
 
-class TestFileUtilsInc < Test::Unit::TestCase
-end
-
 ##
 # These tests are reused in the FileUtils::Verbose, FileUtils::NoWrite and
 # FileUtils::DryRun tests
 
-module TestFileUtilsInc::Visibility
+module TestFileUtilsIncVisibility
 
   FileUtils::METHODS.each do |m|
     define_method "test_singleton_visibility_#{m}" do

test/mkmf/base.rb

@@ -20,9 +20,7 @@ $INCFLAGS << " -I."
 $extout_prefix = "$(extout)$(target_prefix)/"
 
 class TestMkmf < Test::Unit::TestCase
-end
+  module Base
-
-module TestMkmf::Base
     MKMFLOG = proc {File.read("mkmf.log") rescue ""}
 
     class Capture
@@ -144,10 +142,9 @@ module TestMkmf::Base
       end
       nil
     end
-end
+  end
 
-class TestMkmf
+  include Base
-  include TestMkmf::Base
 
   def assert_separately(args, src, *rest, **options)
     super(args + ["-r#{__FILE__}"], "extend TestMkmf::Base; setup\nEND{teardown}\n#{src}", *rest, **options)

test/mkmf/test_config.rb

@@ -4,8 +4,7 @@ $extmk = true
 require 'test/unit'
 require 'mkmf'
 
-class TestMkmf < Test::Unit::TestCase
+class TestMkmfConfig < Test::Unit::TestCase
-  class TestConfig < Test::Unit::TestCase
   def test_dir_config
     bug8074 = '[Bug #8074]'
     lib = RbConfig.expand(RbConfig::MAKEFILE_CONFIG["libdir"], "exec_prefix"=>"")
@@ -13,5 +12,4 @@ class TestMkmf < Test::Unit::TestCase
       assert_equal(%w[/test/foo/include /test/foo#{lib}], dir_config("foo"), #{bug8074.dump})
     }
   end
-  end
 end

test/mkmf/test_constant.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: false
 require_relative 'base'
 
-class TestMkmf
+class TestMkmfTryConstant < TestMkmf
-  class TestTryConstant < TestMkmf
   def test_simple
     assert_equal( 0, mkmf {try_constant("0")}, MKMFLOG)
     assert_equal( 1, mkmf {try_constant("1")}, MKMFLOG)
@@ -34,5 +33,4 @@ class TestMkmf
   def test_large_unsigned
     assert_operator(mkmf {try_constant("1U<<(CHAR_BIT*sizeof(int)-1)")}, :>, 0, MKMFLOG)
   end
-  end
 end

test/mkmf/test_convertible.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: false
 require_relative 'base'
 
-class TestMkmf
+class TestMkmfConvertible < TestMkmf
-  class TestConvertible < TestMkmf
   def test_typeof_builtin
     ["", ["signed ", ""], "unsigned "].each do |signed, prefix|
       %w[short int long].each do |type|
@@ -31,5 +30,4 @@ class TestMkmf
   ensure
     File.unlink("confdefs.h")
   end
-  end
 end

test/mkmf/test_egrep_cpp.rb

@@ -2,8 +2,7 @@
 require_relative 'base'
 require 'tempfile'
 
-class TestMkmf
+class TestMkmfEgrepCpp < TestMkmf
-  class TestEgrepCpp < TestMkmf
   def test_egrep_cpp
     assert_equal(true, egrep_cpp(/ruby_init/, ""), MKMFLOG)
   end
@@ -11,5 +10,4 @@ class TestMkmf
   def test_not_have_func
     assert_equal(false, egrep_cpp(/never match/, ""), MKMFLOG)
   end
-  end
 end

test/mkmf/test_find_executable.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: false
 require_relative 'base'
 
-class TestMkmf
+class TestMkmfFindExecutable < TestMkmf
-  class TestFindExecutable < TestMkmf
   def setup
     super
     @path, ENV["PATH"] = ENV["PATH"], @tmpdir
@@ -54,5 +53,4 @@ class TestMkmf
       test_find_executable
     end
   end
-  end
 end

test/mkmf/test_flags.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: false
 require_relative 'base'
 
-class TestMkmf
+class TestMkmfFlags < TestMkmf
-  class TestFlags < TestMkmf
   def test_valid_warnflags
     val = $extmk
     warnflags = $warnflags
@@ -53,5 +52,4 @@ class TestMkmf
       assert(have_devel?, TestMkmf::MKMFLOG)
     end;
   end
-  end
 end

test/mkmf/test_framework.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: false
 require_relative 'base'
 
-class TestMkmf
+class TestMkmfHaveFramework < TestMkmf
-  class TestHaveFramework < TestMkmf
   def create_framework(fw, hdrname = "#{fw}.h")
     Dir.mktmpdir("frameworks") do |dir|
       fwdir = "#{dir}/#{fw}.framework"
@@ -45,5 +44,4 @@ class TestMkmf
       assert(have_framework([fw, hdrname]), MKMFLOG)
     end
   end
-  end
 end if /darwin/ =~ RUBY_PLATFORM

test/mkmf/test_have_func.rb

@@ -2,8 +2,7 @@
 require_relative 'base'
 require 'tempfile'
 
-class TestMkmf
+class TestMkmfHaveFunc < TestMkmf
-  class TestHaveFunc < TestMkmf
   def test_have_func
     assert_equal(true, have_func("ruby_init"), MKMFLOG)
     assert_include($defs, '-DHAVE_RUBY_INIT')
@@ -13,5 +12,4 @@ class TestMkmf
     assert_equal(false, have_func("no_ruby_init"), MKMFLOG)
     assert_not_include($defs, '-DHAVE_RUBY_INIT')
   end
-  end
 end

test/mkmf/test_have_library.rb

@@ -2,8 +2,7 @@
 require_relative 'base'
 require 'tempfile'
 
-class TestMkmf
+class TestMkmfHaveLibrary < TestMkmf
-  class TestHaveLibrary < TestMkmf
   LIBRARY_NAME = 'mkmftest'
   HEADER_NAME = "#{LIBRARY_NAME}.h"
   FUNC_NAME = 'ruby_mkmftest_foo'
@@ -52,5 +51,4 @@ class TestMkmf
     create_library
     assert_not_have_library("#{FUNC_NAME}_fake", HEADER_NAME)
   end
-  end
 end

test/mkmf/test_have_macro.rb

@@ -2,8 +2,7 @@
 require_relative 'base'
 require 'tempfile'
 
-class TestMkmf
+class TestMkmfHaveMacro < TestMkmf
-  class TestHaveMacro < TestMkmf
   MACRO_NAME = "RUBY_MKMFTEST_FOOBAR"
 
   def test_have_macro_opt
@@ -32,5 +31,4 @@ class TestMkmf
       assert_equal(false, have_macro(MACRO_NAME, base, "-I."), MKMFLOG)
     end
   end
-  end
 end

test/mkmf/test_install.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: false
 require_relative 'base'
 
-class TestMkmf
+class TestMkmfInstall < TestMkmf
-  class TestInstall < TestMkmf
   def test_install_dirs
     Dir.mktmpdir do |dir|
       File.write(dir+"/extconf.rb", "require 'mkmf'; create_makefile('test')")
@@ -26,5 +25,4 @@ class TestMkmf
       end
     end
   end
-  end
 end

test/mkmf/test_libs.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: false
 require_relative 'base'
 
-class TestMkmf
+class TestMkmfLibs < TestMkmf
-  class TestLibs < TestMkmf
   def test_split_libs
     assert_equal(%w[-lfoo -lbar], split_libs("-lfoo -lbar"))
   end
@@ -90,5 +89,4 @@ class TestMkmf
     assert_in_order(array, "d", "c", bug7467)
     assert_in_order(array, "c", "e", bug7467)
   end
-  end
 end if RUBY_ENGINE == "ruby"

test/mkmf/test_mkmf.rb

@@ -2,8 +2,7 @@
 require 'test/unit'
 require 'mkmf'
 
-class TestMkmf < Test::Unit::TestCase
+class TestMkmfGlobal < Test::Unit::TestCase
-  class TestGlobal < TestMkmf
   main = TOPLEVEL_BINDING.receiver
   MakeMakefile.public_instance_methods(false).each do |m|
     define_method(:"test_global_#{m}") do
@@ -11,5 +10,4 @@ class TestMkmf < Test::Unit::TestCase
       assert_not_respond_to(main, [m, false])
     end
   end
-  end
 end

test/mkmf/test_pkg_config.rb

@@ -2,8 +2,7 @@
 require_relative 'base'
 require 'shellwords'
 
-class TestMkmf
+class TestMkmfPkgConfig < TestMkmf
-  class TestPkgConfig < TestMkmf
   PKG_CONFIG = find_executable0("pkg-config")
 
   def setup
@@ -64,5 +63,4 @@ class TestMkmf
     actual = pkg_config("test1", "libs", "static").shellsplit.sort
     assert_equal(expected, actual, MKMFLOG)
   end
-  end
 end

test/mkmf/test_signedness.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: false
 require_relative 'base'
 
-class TestMkmf
+class TestMkmfSignedness < TestMkmf
-  class TestSignedness < TestMkmf
   def test_typeof_builtin
     bug4144 = '[ruby-dev:42731]'
     [["", "-1"], ["signed ", "-1"], ["unsigned ", "+1"]].each do |signed, expect|
@@ -26,5 +25,4 @@ class TestMkmf
   ensure
     File.unlink("confdefs.h")
   end
-  end
 end

test/mkmf/test_sizeof.rb

@@ -1,8 +1,7 @@
 # frozen_string_literal: false
 require_relative 'base'
 
-class TestMkmf
+class TestMkmfSizeof < TestMkmf
-  class TestSizeof < TestMkmf
   def setup
     super
     @sizeof_short = config_value("SIZEOF_SHORT").to_i
@@ -44,5 +43,4 @@ class TestMkmf
   ensure
     File.unlink("confdefs.h")
   end
-  end
 end

test/optparse/test_acceptable.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-class TestOptionParser::Acceptable < TestOptionParser
+class TestOptionParserAcceptable < TestOptionParser
 
   def setup
     super

test/optparse/test_autoconf.rb

@@ -2,9 +2,7 @@
 require 'test/unit'
 require 'optparse/ac'
 
-class TestOptionParser < Test::Unit::TestCase; end
+class TestOptionParserAutoConf < Test::Unit::TestCase
-
-class TestOptionParser::AutoConf < Test::Unit::TestCase
   def setup
     @opt = OptionParser::AC.new
     @foo = @bar = self.class

test/optparse/test_bash_completion.rb

@@ -2,9 +2,7 @@
 require 'test/unit'
 require 'optparse'
 
-class TestOptionParser < Test::Unit::TestCase
+class TestOptionParserBashCompletion < Test::Unit::TestCase
-end
-class TestOptionParser::BashCompletion < Test::Unit::TestCase
   def setup
     @opt = OptionParser.new
     @opt.define("-z", "zzz") {}

test/optparse/test_cclass.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-class TestOptionParser::CClass < TestOptionParser
+class TestOptionParserCClass < TestOptionParser
   def test_no_argument
     flags = []
     @opt.def_option("-[a-z]") {|x| flags << x}

test/optparse/test_did_you_mean.rb

@@ -6,7 +6,7 @@ rescue LoadError
   return
 end
 
-class TestOptionParser::DidYouMean < TestOptionParser
+class TestOptionParserDidYouMean < TestOptionParser
   def setup
     super
     @opt.def_option("--foo", Integer) { |v| @foo = v }

test/optparse/test_getopts.rb

@@ -2,9 +2,7 @@
 require 'test/unit'
 require 'optparse'
 
-class TestOptionParser < Test::Unit::TestCase
+class TestOptionParserGetopts < Test::Unit::TestCase
-end
-class TestOptionParser::Getopts < Test::Unit::TestCase
   def setup
     @opt = OptionParser.new
   end

test/optparse/test_kwargs.rb

@@ -3,9 +3,7 @@ require 'test/unit'
 require 'optparse'
 require 'optparse/kwargs'
 
-class TestOptionParser < Test::Unit::TestCase
+class TestOptionParserKwArg < Test::Unit::TestCase
-end
-class TestOptionParser::KwArg < Test::Unit::TestCase
   class K
     def initialize(host:, port: 8080)
       @host = host

test/optparse/test_noarg.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-module TestOptionParser::NoArg
+module TestOptionParserNoArg
   def setup
     super
     @opt.def_option "--with_underscore" do |x| @flag = x end
@@ -9,7 +9,7 @@ module TestOptionParser::NoArg
   end
 
   class Def1 < TestOptionParser
-    include NoArg
+    include TestOptionParserNoArg
     def setup
       super
       @opt.def_option("-x") {|x| @flag = x}
@@ -17,7 +17,7 @@ module TestOptionParser::NoArg
     end
   end
   class Def2 < TestOptionParser
-    include NoArg
+    include TestOptionParserNoArg
     def setup
       super
       @opt.def_option("-x", "--option") {|x| @flag = x}

test/optparse/test_optarg.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-class TestOptionParser::OptArg < TestOptionParser
+class TestOptionParserOptArg < TestOptionParser
   def setup
     super
     @opt.def_option("-x[VAL]") {|x| @flag = x}

test/optparse/test_placearg.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-class TestOptionParser::PlaceArg < TestOptionParser
+class TestOptionParserPlaceArg < TestOptionParser
   def setup
     super
     @opt.def_option("-x [VAL]") {|x| @flag = x}

test/optparse/test_reqarg.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-module TestOptionParser::ReqArg
+module TestOptionParserReqArg
   def setup
     super
     @opt.def_option "--with_underscore=VAL" do |x| @flag = x end
@@ -9,7 +9,7 @@ module TestOptionParser::ReqArg
   end
 
   class Def1 < TestOptionParser
-    include ReqArg
+    include TestOptionParserReqArg
     def setup
       super
       @opt.def_option("-xVAL") {|x| @flag = x}
@@ -19,21 +19,21 @@ module TestOptionParser::ReqArg
     end
   end
   class Def2 < TestOptionParser
-    include ReqArg
+    include TestOptionParserReqArg
     def setup
       super
       @opt.def_option("-x", "--option=VAL") {|x| @flag = x}
     end
   end
   class Def3 < TestOptionParser
-    include ReqArg
+    include TestOptionParserReqArg
     def setup
       super
       @opt.def_option("--option=VAL", "-x") {|x| @flag = x}
     end
   end
   class Def4 < TestOptionParser
-    include ReqArg
+    include TestOptionParserReqArg
     def setup
       super
       @opt.def_option("-xVAL", "--option=VAL") {|x| @flag = x}

test/optparse/test_summary.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-class TestOptionParser::SummaryTest < TestOptionParser
+class TestOptionParserSummaryTest < TestOptionParser
   def test_short_clash
     r = nil
     o = OptionParser.new do |opts|

test/optparse/test_zsh_completion.rb

@@ -2,9 +2,7 @@
 require 'test/unit'
 require 'optparse'
 
-class TestOptionParser < Test::Unit::TestCase
+class TestOptionParserZshCompletion < Test::Unit::TestCase
-end
-class TestOptionParser::ZshCompletion < Test::Unit::TestCase
   def setup
     @opt = OptionParser.new
     @opt.define("-z", "zzz") {}

test/ruby/enc/test_emoji_breaks.rb

@@ -4,9 +4,7 @@
 require "test/unit"
 
 class TestEmojiBreaks < Test::Unit::TestCase
-end
+  class BreakTest
-
-class TestEmojiBreaks::BreakTest
     attr_reader :string, :comment, :filename, :line_number, :type, :shortname
 
     def initialize(filename, line_number, data, comment='')
@@ -29,9 +27,9 @@ class TestEmojiBreaks::BreakTest
                             c.chr('UTF-8')
                           end.join
     end
-end
+  end
 
-class TestEmojiBreaks::BreakFile
+  class BreakFile
     attr_reader :basename, :fullname, :version
     FILES = []
 
@@ -45,9 +43,8 @@ class TestEmojiBreaks::BreakFile
     def self.files
       FILES
     end
-end
+  end
 
-class TestEmojiBreaks < Test::Unit::TestCase
   UNICODE_VERSION   = RbConfig::CONFIG['UNICODE_VERSION']
   UNICODE_DATA_PATH = File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}/ucd/emoji", __dir__)
   EMOJI_VERSION     = RbConfig::CONFIG['UNICODE_EMOJI_VERSION']
@@ -71,9 +68,8 @@ class TestEmojiBreaks < Test::Unit::TestCase
       omit "Emoji data files not available in #{EMOJI_DATA_PATH}."
     end
   end
-end
 
-TestEmojiBreaks.data_files_available? and  class TestEmojiBreaks
+  if data_files_available?
     def read_data
       tests = []
       EMOJI_DATA_FILES.each do |file|
@@ -154,4 +150,5 @@ TestEmojiBreaks.data_files_available? and  class TestEmojiBreaks
         end
       end
     end
+  end
 end

test/ruby/enc/test_grapheme_breaks.rb

@@ -4,9 +4,7 @@
 require "test/unit"
 
 class TestGraphemeBreaksFromFile < Test::Unit::TestCase
-end
+  class BreakTest
-
-class TestGraphemeBreaksFromFile::BreakTest
     attr_reader :clusters, :string, :comment, :line_number
 
     def initialize(line_number, data, comment)
@@ -26,9 +24,8 @@ class TestGraphemeBreaksFromFile::BreakTest
                       end
       @string = @clusters.join
     end
-end
+  end
 
-class TestGraphemeBreaksFromFile < Test::Unit::TestCase
   UNICODE_VERSION = RbConfig::CONFIG['UNICODE_VERSION']
   path = File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}", __dir__)
   UNICODE_DATA_PATH = File.directory?("#{path}/ucd/auxiliary") ? "#{path}/ucd/auxiliary" : path
@@ -43,9 +40,8 @@ class TestGraphemeBreaksFromFile < Test::Unit::TestCase
       omit "Unicode data file GraphemeBreakTest not available in #{UNICODE_DATA_PATH}."
     end
   end
-end
 
-TestGraphemeBreaksFromFile.file_available? and  class TestGraphemeBreaksFromFile
+  if file_available?
     def read_data
       tests = []
       IO.foreach(GRAPHEME_BREAK_TEST_FILE, encoding: Encoding::UTF_8) do |line|
@@ -92,4 +88,5 @@ TestGraphemeBreaksFromFile.file_available? and  class TestGraphemeBreaksFromFile
           "but got '#{string}', comment: #{test.comment}"
       end
     end
+  end
 end

test/ruby/test_inlinecache.rb

@@ -3,7 +3,7 @@
 
 require 'test/unit'
 
-class TestMethod < Test::Unit::TestCase
+class TestMethodInlineCache < Test::Unit::TestCase
   def test_alias
     m0 = Module.new do
       def foo; :M0 end