Use test-unit

.gitignore

@@ -6,3 +6,6 @@
 /pkg/
 /spec/reports/
 /tmp/
+Gemfile.lock
+*.bundle
+*.so

Gemfile

@@ -4,3 +4,4 @@ gemspec
 
 gem "rake"
 gem "rake-compiler"
+gem "test-unit"

Rakefile

@@ -3,9 +3,17 @@ require "rake/testtask"
 
 Rake::TestTask.new(:test) do |t|
   t.libs << "test/lib"
+  t.ruby_opts << "-rhelper"
   t.test_files = FileList["test/**/test_*.rb"]
 end
 
+task :sync_tool do
+  require 'fileutils'
+  FileUtils.cp "../ruby/tool/lib/test/unit/core_assertions.rb", "./test/lib"
+  FileUtils.cp "../ruby/tool/lib/envutil.rb", "./test/lib"
+  FileUtils.cp "../ruby/tool/lib/find_executable.rb", "./test/lib"
+end
+
 require 'rake/extensiontask'
 Rake::ExtensionTask.new("pathname")
 

test/lib/core_assertions.rb

@@ -115,7 +115,7 @@ def syntax_check(code, fname, line)
 
       def assert_no_memory_leak(args, prepare, code, message=nil, limit: 2.0, rss: false, **opt)
         # TODO: consider choosing some appropriate limit for MJIT and stop skipping this once it does not randomly fail
-        pend 'assert_no_memory_leak may consider MJIT memory usage as leak' if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
+        pend 'assert_no_memory_leak may consider MJIT memory usage as leak' if defined?(RubyVM::JIT) && RubyVM::JIT.enabled?
 
         require_relative '../../memory_status'
         raise MiniTest::Skip, "unsupported platform" unless defined?(Memory::Status)
@@ -264,7 +264,7 @@ def separated_runner(out = nil)
         at_exit {
           out.puts [Marshal.dump($!)].pack('m'), "assertions=\#{self._assertions}"
         }
-        Test::Unit::Runner.class_variable_set(:@@stop_auto_run, true)
+        Test::Unit::Runner.class_variable_set(:@@stop_auto_run, true) if defined?(Test::Unit::Runner)
       end
 
       def assert_separately(args, file = nil, line = nil, src, ignore_stderr: nil, **opt)
@@ -276,7 +276,7 @@ def assert_separately(args, file = nil, line = nil, src, ignore_stderr: nil, **o
         capture_stdout = true
         unless /mswin|mingw/ =~ RUBY_PLATFORM
           capture_stdout = false
-          opt[:out] = MiniTest::Unit.output
+          opt[:out] = MiniTest::Unit.output if defined?(MiniTest::Unit)
           res_p, res_c = IO.pipe
           opt[res_c.fileno] = res_c.fileno
         end
@@ -330,6 +330,27 @@ def assert_separately(args, file = nil, line = nil, src, ignore_stderr: nil, **o
         raise marshal_error if marshal_error
       end
 
+      # Run Ractor-related test without influencing the main test suite
+      def assert_ractor(src, args: [], require: nil, require_relative: nil, file: nil, line: nil, ignore_stderr: nil, **opt)
+        return unless defined?(Ractor)
+
+        require = "require #{require.inspect}" if require
+        if require_relative
+          dir = File.dirname(caller_locations[0,1][0].absolute_path)
+          full_path = File.expand_path(require_relative, dir)
+          require = "#{require}; require #{full_path.inspect}"
+        end
+
+        assert_separately(args, file, line, <<~RUBY, ignore_stderr: ignore_stderr, **opt)
+          #{require}
+          previous_verbose = $VERBOSE
+          $VERBOSE = nil
+          Ractor.new {} # trigger initial warning
+          $VERBOSE = previous_verbose
+          #{src}
+        RUBY
+      end
+
       # :call-seq:
       #   assert_throw( tag, failure_message = nil, &block )
       #
@@ -587,6 +608,20 @@ def assert_warn(*args)
         assert_warning(*args) {$VERBOSE = false; yield}
       end
 
+      def assert_deprecated_warning(mesg = /deprecated/)
+        assert_warning(mesg) do
+          Warning[:deprecated] = true
+          yield
+        end
+      end
+
+      def assert_deprecated_warn(mesg = /deprecated/)
+        assert_warn(mesg) do
+          Warning[:deprecated] = true
+          yield
+        end
+      end
+
       class << (AssertFile = Struct.new(:failure_message).new)
         include CoreAssertions
         def assert_file_predicate(predicate, *args)