Move to tool/lib from test/lib.

1 files changed, 984 insertions, 0 deletions

diff --git a/tool/lib/test/unit/assertions.rb b/tool/lib/test/unit/assertions.rb
new file mode 100644
index 0000000000..169a3dcc7e
--- /dev/null
+++ b/tool/lib/test/unit/assertions.rb
@@ -0,0 +1,984 @@
+# frozen_string_literal: true
+require 'minitest/unit'
+require 'pp'
+
+module Test
+  module Unit
+    module Assertions
+      include MiniTest::Assertions
+
+      def mu_pp(obj) #:nodoc:
+        obj.pretty_inspect.chomp
+      end
+
+      MINI_DIR = File.join(File.dirname(File.dirname(File.expand_path(__FILE__))), "minitest") #:nodoc:
+
+      # :call-seq:
+      #   assert(test, [failure_message])
+      #
+      #Tests if +test+ is true.
+      #
+      #+msg+ may be a String or a Proc. If +msg+ is a String, it will be used
+      #as the failure message. Otherwise, the result of calling +msg+ will be
+      #used as the message if the assertion fails.
+      #
+      #If no +msg+ is given, a default message will be used.
+      #
+      #    assert(false, "This was expected to be true")
+      def assert(test, *msgs)
+        case msg = msgs.first
+        when String, Proc
+        when nil
+          msgs.shift
+        else
+          bt = caller.reject { |s| s.start_with?(MINI_DIR) }
+          raise ArgumentError, "assertion message must be String or Proc, but #{msg.class} was given.", bt
+        end unless msgs.empty?
+        super
+      end
+
+      # :call-seq:
+      #   assert_block( failure_message = nil )
+      #
+      #Tests the result of the given block. If the block does not return true,
+      #the assertion will fail. The optional +failure_message+ argument is the same as in
+      #Assertions#assert.
+      #
+      #    assert_block do
+      #      [1, 2, 3].any? { |num| num < 1 }
+      #    end
+      def assert_block(*msgs)
+        assert yield, *msgs
+      end
+
+      # :call-seq:
+      #   assert_raise( *args, &block )
+      #
+      #Tests if the given block raises an exception. Acceptable exception
+      #types may be given as optional arguments. If the last argument is a
+      #String, it will be used as the error message.
+      #
+      #    assert_raise do #Fails, no Exceptions are raised
+      #    end
+      #
+      #    assert_raise NameError do
+      #      puts x  #Raises NameError, so assertion succeeds
+      #    end
+      def assert_raise(*exp, &b)
+        case exp.last
+        when String, Proc
+          msg = exp.pop
+        end
+
+        begin
+          yield
+        rescue MiniTest::Skip => e
+          return e if exp.include? MiniTest::Skip
+          raise e
+        rescue Exception => e
+          expected = exp.any? { |ex|
+            if ex.instance_of? Module then
+              e.kind_of? ex
+            else
+              e.instance_of? ex
+            end
+          }
+
+          assert expected, proc {
+            exception_details(e, message(msg) {"#{mu_pp(exp)} exception expected, not"}.call)
+          }
+
+          return e
+        ensure
+          unless e
+            exp = exp.first if exp.size == 1
+
+            flunk(message(msg) {"#{mu_pp(exp)} expected but nothing was raised"})
+          end
+        end
+      end
+
+      def assert_raises(*exp, &b)
+        raise NoMethodError, "use assert_raise", caller
+      end
+
+      # :call-seq:
+      #   assert_raise_with_message(exception, expected, msg = nil, &block)
+      #
+      #Tests if the given block raises an exception with the expected
+      #message.
+      #
+      #    assert_raise_with_message(RuntimeError, "foo") do
+      #      nil #Fails, no Exceptions are raised
+      #    end
+      #
+      #    assert_raise_with_message(RuntimeError, "foo") do
+      #      raise ArgumentError, "foo" #Fails, different Exception is raised
+      #    end
+      #
+      #    assert_raise_with_message(RuntimeError, "foo") do
+      #      raise "bar" #Fails, RuntimeError is raised but the message differs
+      #    end
+      #
+      #    assert_raise_with_message(RuntimeError, "foo") do
+      #      raise "foo" #Raises RuntimeError with the message, so assertion succeeds
+      #    end
+      def assert_raise_with_message(exception, expected, msg = nil, &block)
+        case expected
+        when String
+          assert = :assert_equal
+        when Regexp
+          assert = :assert_match
+        else
+          raise TypeError, "Expected #{expected.inspect} to be a kind of String or Regexp, not #{expected.class}"
+        end
+
+        ex = m = nil
+        EnvUtil.with_default_internal(expected.encoding) do
+          ex = assert_raise(exception, msg || proc {"Exception(#{exception}) with message matches to #{expected.inspect}"}) do
+            yield
+          end
+          m = ex.message
+        end
+        msg = message(msg, "") {"Expected Exception(#{exception}) was raised, but the message doesn't match"}
+
+        if assert == :assert_equal
+          assert_equal(expected, m, msg)
+        else
+          msg = message(msg) { "Expected #{mu_pp expected} to match #{mu_pp m}" }
+          assert expected =~ m, msg
+          block.binding.eval("proc{|_|$~=_}").call($~)
+        end
+        ex
+      end
+
+      # :call-seq:
+      #   assert_nothing_raised( *args, &block )
+      #
+      #If any exceptions are given as arguments, the assertion will
+      #fail if one of those exceptions are raised. Otherwise, the test fails
+      #if any exceptions are raised.
+      #
+      #The final argument may be a failure message.
+      #
+      #    assert_nothing_raised RuntimeError do
+      #      raise Exception #Assertion passes, Exception is not a RuntimeError
+      #    end
+      #
+      #    assert_nothing_raised do
+      #      raise Exception #Assertion fails
+      #    end
+      def assert_nothing_raised(*args)
+        self._assertions += 1
+        if Module === args.last
+          msg = nil
+        else
+          msg = args.pop
+        end
+        begin
+          line = __LINE__; yield
+        rescue MiniTest::Skip
+          raise
+        rescue Exception => e
+          bt = e.backtrace
+          as = e.instance_of?(MiniTest::Assertion)
+          if as
+            ans = /\A#{Regexp.quote(__FILE__)}:#{line}:in /o
+            bt.reject! {|ln| ans =~ ln}
+          end
+          if ((args.empty? && !as) ||
+              args.any? {|a| a.instance_of?(Module) ? e.is_a?(a) : e.class == a })
+            msg = message(msg) { "Exception raised:\n<#{mu_pp(e)}>" }
+            raise MiniTest::Assertion, msg.call, bt
+          else
+            raise
+          end
+        end
+      end
+
+      # :call-seq:
+      #   assert_nothing_thrown( failure_message = nil, &block )
+      #
+      #Fails if the given block uses a call to Kernel#throw, and
+      #returns the result of the block otherwise.
+      #
+      #An optional failure message may be provided as the final argument.
+      #
+      #    assert_nothing_thrown "Something was thrown!" do
+      #      throw :problem?
+      #    end
+      def assert_nothing_thrown(msg=nil)
+        begin
+          ret = yield
+        rescue ArgumentError => error
+          raise error if /\Auncaught throw (.+)\z/m !~ error.message
+          msg = message(msg) { "<#{$1}> was thrown when nothing was expected" }
+          flunk(msg)
+        end
+        assert(true, "Expected nothing to be thrown")
+        ret
+      end
+
+      # :call-seq:
+      #   assert_throw( tag, failure_message = nil, &block )
+      #
+      #Fails unless the given block throws +tag+, returns the caught
+      #value otherwise.
+      #
+      #An optional failure message may be provided as the final argument.
+      #
+      #    tag = Object.new
+      #    assert_throw(tag, "#{tag} was not thrown!") do
+      #      throw tag
+      #    end
+      def assert_throw(tag, msg = nil)
+        ret = catch(tag) do
+          begin
+            yield(tag)
+          rescue UncaughtThrowError => e
+            thrown = e.tag
+          end
+          msg = message(msg) {
+            "Expected #{mu_pp(tag)} to have been thrown"\
+            "#{%Q[, not #{thrown}] if thrown}"
+          }
+          assert(false, msg)
+        end
+        assert(true)
+        ret
+      end
+
+      # :call-seq:
+      #   assert_equal( expected, actual, failure_message = nil )
+      #
+      #Tests if +expected+ is equal to +actual+.
+      #
+      #An optional failure message may be provided as the final argument.
+      def assert_equal(exp, act, msg = nil)
+        msg = message(msg) {
+          exp_str = mu_pp(exp)
+          act_str = mu_pp(act)
+          exp_comment = ''
+          act_comment = ''
+          if exp_str == act_str
+            if (exp.is_a?(String) && act.is_a?(String)) ||
+               (exp.is_a?(Regexp) && act.is_a?(Regexp))
+              exp_comment = " (#{exp.encoding})"
+              act_comment = " (#{act.encoding})"
+            elsif exp.is_a?(Float) && act.is_a?(Float)
+              exp_str = "%\#.#{Float::DIG+2}g" % exp
+              act_str = "%\#.#{Float::DIG+2}g" % act
+            elsif exp.is_a?(Time) && act.is_a?(Time)
+              if exp.subsec * 1000_000_000 == exp.nsec
+                exp_comment = " (#{exp.nsec}[ns])"
+              else
+                exp_comment = " (subsec=#{exp.subsec})"
+              end
+              if act.subsec * 1000_000_000 == act.nsec
+                act_comment = " (#{act.nsec}[ns])"
+              else
+                act_comment = " (subsec=#{act.subsec})"
+              end
+            elsif exp.class != act.class
+              # a subclass of Range, for example.
+              exp_comment = " (#{exp.class})"
+              act_comment = " (#{act.class})"
+            end
+          elsif !Encoding.compatible?(exp_str, act_str)
+            if exp.is_a?(String) && act.is_a?(String)
+              exp_str = exp.dump
+              act_str = act.dump
+              exp_comment = " (#{exp.encoding})"
+              act_comment = " (#{act.encoding})"
+            else
+              exp_str = exp_str.dump
+              act_str = act_str.dump
+            end
+          end
+          "<#{exp_str}>#{exp_comment} expected but was\n<#{act_str}>#{act_comment}"
+        }
+        assert(exp == act, msg)
+      end
+
+      # :call-seq:
+      #   assert_not_nil( expression, failure_message = nil )
+      #
+      #Tests if +expression+ is not nil.
+      #
+      #An optional failure message may be provided as the final argument.
+      def assert_not_nil(exp, msg=nil)
+        msg = message(msg) { "<#{mu_pp(exp)}> expected to not be nil" }
+        assert(!exp.nil?, msg)
+      end
+
+      # :call-seq:
+      #   assert_not_equal( expected, actual, failure_message = nil )
+      #
+      #Tests if +expected+ is not equal to +actual+.
+      #
+      #An optional failure message may be provided as the final argument.
+      def assert_not_equal(exp, act, msg=nil)
+        msg = message(msg) { "<#{mu_pp(exp)}> expected to be != to\n<#{mu_pp(act)}>" }
+        assert(exp != act, msg)
+      end
+
+      # :call-seq:
+      #   assert_no_match( regexp, string, failure_message = nil )
+      #
+      #Tests if the given Regexp does not match a given String.
+      #
+      #An optional failure message may be provided as the final argument.
+      def assert_no_match(regexp, string, msg=nil)
+        assert_instance_of(Regexp, regexp, "The first argument to assert_no_match should be a Regexp.")
+        self._assertions -= 1
+        msg = message(msg) { "<#{mu_pp(regexp)}> expected to not match\n<#{mu_pp(string)}>" }
+        assert(regexp !~ string, msg)
+      end
+
+      # :call-seq:
+      #   assert_not_same( expected, actual, failure_message = nil )
+      #
+      #Tests if +expected+ is not the same object as +actual+.
+      #This test uses Object#equal? to test equality.
+      #
+      #An optional failure message may be provided as the final argument.
+      #
+      #    assert_not_same("x", "x") #Succeeds
+      def assert_not_same(expected, actual, message="")
+        msg = message(msg) { build_message(message, <<EOT, expected, expected.__id__, actual, actual.__id__) }
+<?>
+with id <?> expected to not be equal\\? to
+<?>
+with id <?>.
+EOT
+        assert(!actual.equal?(expected), msg)
+      end
+
+      # :call-seq:
+      #   assert_respond_to( object, method, failure_message = nil )
+      #
+      #Tests if the given Object responds to +method+.
+      #
+      #An optional failure message may be provided as the final argument.
+      #
+      #    assert_respond_to("hello", :reverse)  #Succeeds
+      #    assert_respond_to("hello", :does_not_exist)  #Fails
+      def assert_respond_to(obj, (meth, *priv), msg = nil)
+        unless priv.empty?
+          msg = message(msg) {
+            "Expected #{mu_pp(obj)} (#{obj.class}) to respond to ##{meth}#{" privately" if priv[0]}"
+          }
+          return assert obj.respond_to?(meth, *priv), msg
+        end
+        #get rid of overcounting
+        if caller_locations(1, 1)[0].path.start_with?(MINI_DIR)
+          return if obj.respond_to?(meth)
+        end
+        super(obj, meth, msg)
+      end
+
+      # :call-seq:
+      #   assert_not_respond_to( object, method, failure_message = nil )
+      #
+      #Tests if the given Object does not respond to +method+.
+      #
+      #An optional failure message may be provided as the final argument.
+      #
+      #    assert_not_respond_to("hello", :reverse)  #Fails
+      #    assert_not_respond_to("hello", :does_not_exist)  #Succeeds
+      def assert_not_respond_to(obj, (meth, *priv), msg = nil)
+        unless priv.empty?
+          msg = message(msg) {
+            "Expected #{mu_pp(obj)} (#{obj.class}) to not respond to ##{meth}#{" privately" if priv[0]}"
+          }
+          return assert !obj.respond_to?(meth, *priv), msg
+        end
+        #get rid of overcounting
+        if caller_locations(1, 1)[0].path.start_with?(MINI_DIR)
+          return unless obj.respond_to?(meth)
+        end
+        refute_respond_to(obj, meth, msg)
+      end
+
+      # :call-seq:
+      #   assert_send( +send_array+, failure_message = nil )
+      #
+      # Passes if the method send returns a true value.
+      #
+      # +send_array+ is composed of:
+      # * A receiver
+      # * A method
+      # * Arguments to the method
+      #
+      # Example:
+      #   assert_send(["Hello world", :include?, "Hello"])    # -> pass
+      #   assert_send(["Hello world", :include?, "Goodbye"])  # -> fail
+      def assert_send send_ary, m = nil
+        recv, msg, *args = send_ary
+        m = message(m) {
+          if args.empty?
+            argsstr = ""
+          else
+            (argsstr = mu_pp(args)).sub!(/\A\[(.*)\]\z/m, '(\1)')
+          end
+          "Expected #{mu_pp(recv)}.#{msg}#{argsstr} to return true"
+        }
+        assert recv.__send__(msg, *args), m
+      end
+
+      # :call-seq:
+      #   assert_not_send( +send_array+, failure_message = nil )
+      #
+      # Passes if the method send doesn't return a true value.
+      #
+      # +send_array+ is composed of:
+      # * A receiver
+      # * A method
+      # * Arguments to the method
+      #
+      # Example:
+      #   assert_not_send([[1, 2], :member?, 1]) # -> fail
+      #   assert_not_send([[1, 2], :member?, 4]) # -> pass
+      def assert_not_send send_ary, m = nil
+        recv, msg, *args = send_ary
+        m = message(m) {
+          if args.empty?
+            argsstr = ""
+          else
+            (argsstr = mu_pp(args)).sub!(/\A\[(.*)\]\z/m, '(\1)')
+          end
+          "Expected #{mu_pp(recv)}.#{msg}#{argsstr} to return false"
+        }
+        assert !recv.__send__(msg, *args), m
+      end
+
+      ms = instance_methods(true).map {|sym| sym.to_s }
+      ms.grep(/\Arefute_/) do |m|
+        mname = ('assert_not_'.dup << m.to_s[/.*?_(.*)/, 1])
+        alias_method(mname, m) unless ms.include? mname
+      end
+      alias assert_include assert_includes
+      alias assert_not_include assert_not_includes
+
+      def assert_all?(obj, m = nil, &blk)
+        failed = []
+        obj.each do |*a, &b|
+          unless blk.call(*a, &b)
+            failed << (a.size > 1 ? a : a[0])
+          end
+        end
+        assert(failed.empty?, message(m) {failed.pretty_inspect})
+      end
+
+      def assert_not_all?(obj, m = nil, &blk)
+        failed = []
+        obj.each do |*a, &b|
+          if blk.call(*a, &b)
+            failed << (a.size > 1 ? a : a[0])
+          end
+        end
+        assert(failed.empty?, message(m) {failed.pretty_inspect})
+      end
+
+      # compatibility with test-unit
+      alias pend skip
+
+      if defined?(RubyVM::InstructionSequence)
+        def syntax_check(code, fname, line)
+          code = code.dup.force_encoding(Encoding::UTF_8)
+          RubyVM::InstructionSequence.compile(code, fname, fname, line)
+          :ok
+        end
+      else
+        def syntax_check(code, fname, line)
+          code = code.b
+          code.sub!(/\A(?:\xef\xbb\xbf)?(\s*\#.*$)*(\n)?/n) {
+            "#$&#{"\n" if $1 && !$2}BEGIN{throw tag, :ok}\n"
+          }
+          code = code.force_encoding(Encoding::UTF_8)
+          catch {|tag| eval(code, binding, fname, line - 1)}
+        end
+      end
+
+      def prepare_syntax_check(code, fname = nil, mesg = nil, verbose: nil)
+        fname ||= caller_locations(2, 1)[0]
+        mesg ||= fname.to_s
+        verbose, $VERBOSE = $VERBOSE, verbose
+        case
+        when Array === fname
+          fname, line = *fname
+        when defined?(fname.path) && defined?(fname.lineno)
+          fname, line = fname.path, fname.lineno
+        else
+          line = 1
+        end
+        yield(code, fname, line, message(mesg) {
+                if code.end_with?("\n")
+                  "```\n#{code}```\n"
+                else
+                  "```\n#{code}\n```\n""no-newline"
+                end
+              })
+      ensure
+        $VERBOSE = verbose
+      end
+
+      def assert_valid_syntax(code, *args, **opt)
+        prepare_syntax_check(code, *args, **opt) do |src, fname, line, mesg|
+          yield if defined?(yield)
+          assert_nothing_raised(SyntaxError, mesg) do
+            assert_equal(:ok, syntax_check(src, fname, line), mesg)
+          end
+        end
+      end
+
+      def assert_syntax_error(code, error, *args)
+        prepare_syntax_check(code, *args) do |src, fname, line, mesg|
+          yield if defined?(yield)
+          e = assert_raise(SyntaxError, mesg) do
+            syntax_check(src, fname, line)
+          end
+          assert_match(error, e.message, mesg)
+          e
+        end
+      end
+
+      def assert_normal_exit(testsrc, message = '', child_env: nil, **opt)
+        assert_valid_syntax(testsrc, caller_locations(1, 1)[0])
+        if child_env
+          child_env = [child_env]
+        else
+          child_env = []
+        end
+        out, _, status = EnvUtil.invoke_ruby(child_env + %W'-W0', testsrc, true, :merge_to_stdout, **opt)
+        assert !status.signaled?, FailDesc[status, message, out]
+      end
+
+      FailDesc = proc do |status, message = "", out = ""|
+        pid = status.pid
+        now = Time.now
+        faildesc = proc do
+          if signo = status.termsig
+            signame = Signal.signame(signo)
+            sigdesc = "signal #{signo}"
+          end
+          log = EnvUtil.diagnostic_reports(signame, pid, now)
+          if signame
+            sigdesc = "SIG#{signame} (#{sigdesc})"
+          end
+          if status.coredump?
+            sigdesc = "#{sigdesc} (core dumped)"
+          end
+          full_message = ''.dup
+          message = message.call if Proc === message
+          if message and !message.empty?
+            full_message << message << "\n"
+          end
+          full_message << "pid #{pid}"
+          full_message << " exit #{status.exitstatus}" if status.exited?
+          full_message << " killed by #{sigdesc}" if sigdesc
+          if out and !out.empty?
+            full_message << "\n" << out.b.gsub(/^/, '| ')
+            full_message.sub!(/(?<!\n)\z/, "\n")
+          end
+          if log
+            full_message << "Diagnostic reports:\n" << log.b.gsub(/^/, '| ')
+          end
+          full_message
+        end
+        faildesc
+      end
+
+      def assert_in_out_err(args, test_stdin = "", test_stdout = [], test_stderr = [], message = nil,
+                            success: nil, **opt)
+        args = Array(args).dup
+        args.insert((Hash === args[0] ? 1 : 0), '--disable=gems')
+        stdout, stderr, status = EnvUtil.invoke_ruby(args, test_stdin, true, true, **opt)
+        if signo = status.termsig
+          EnvUtil.diagnostic_reports(Signal.signame(signo), status.pid, Time.now)
+        end
+        if block_given?
+          raise "test_stdout ignored, use block only or without block" if test_stdout != []
+          raise "test_stderr ignored, use block only or without block" if test_stderr != []
+          yield(stdout.lines.map {|l| l.chomp }, stderr.lines.map {|l| l.chomp }, status)
+        else
+          all_assertions(message) do |a|
+            [["stdout", test_stdout, stdout], ["stderr", test_stderr, stderr]].each do |key, exp, act|
+              a.for(key) do
+                if exp.is_a?(Regexp)
+                  assert_match(exp, act)
+                elsif exp.all? {|e| String === e}
+                  assert_equal(exp, act.lines.map {|l| l.chomp })
+                else
+                  assert_pattern_list(exp, act)
+                end
+              end
+            end
+            unless success.nil?
+              a.for("success?") do
+                if success
+                  assert_predicate(status, :success?)
+                else
+                  assert_not_predicate(status, :success?)
+                end
+              end
+            end
+          end
+          status
+        end
+      end
+
+      def assert_ruby_status(args, test_stdin="", message=nil, **opt)
+        out, _, status = EnvUtil.invoke_ruby(args, test_stdin, true, :merge_to_stdout, **opt)
+        desc = FailDesc[status, message, out]
+        assert(!status.signaled?, desc)
+        message ||= "ruby exit status is not success:"
+        assert(status.success?, desc)
+      end
+
+      ABORT_SIGNALS = Signal.list.values_at(*%w"ILL ABRT BUS SEGV TERM")
+
+      def assert_separately(args, file = nil, line = nil, src, ignore_stderr: nil, **opt)
+        unless file and line
+          loc, = caller_locations(1,1)
+          file ||= loc.path
+          line ||= loc.lineno
+        end
+        src = <<eom
+# -*- coding: #{line += __LINE__; src.encoding}; -*-
+  require #{__dir__.dump};include Test::Unit::Assertions
+  END {
+    puts [Marshal.dump($!)].pack('m'), "assertions=\#{self._assertions}"
+  }
+#{line -= __LINE__; src}
+  class Test::Unit::Runner
+    @@stop_auto_run = true
+  end
+eom
+        args = args.dup
+        args.insert((Hash === args.first ? 1 : 0), "-w", "--disable=gems", *$:.map {|l| "-I#{l}"})
+        stdout, stderr, status = EnvUtil.invoke_ruby(args, src, true, true, **opt)
+        abort = status.coredump? || (status.signaled? && ABORT_SIGNALS.include?(status.termsig))
+        assert(!abort, FailDesc[status, nil, stderr])
+        self._assertions += stdout[/^assertions=(\d+)/, 1].to_i
+        begin
+          res = Marshal.load(stdout.unpack("m")[0])
+        rescue => marshal_error
+          ignore_stderr = nil
+        end
+        if res
+          if bt = res.backtrace
+            bt.each do |l|
+              l.sub!(/\A-:(\d+)/){"#{file}:#{line + $1.to_i}"}
+            end
+            bt.concat(caller)
+          else
+            res.set_backtrace(caller)
+          end
+          raise res unless SystemExit === res
+        end
+
+        # really is it succeed?
+        unless ignore_stderr
+          # the body of assert_separately must not output anything to detect error
+          assert(stderr.empty?, FailDesc[status, "assert_separately failed with error message", stderr])
+        end
+        assert(status.success?, FailDesc[status, "assert_separately failed", stderr])
+        raise marshal_error if marshal_error
+      end
+
+      def assert_warning(pat, msg = nil)
+        result = nil
+        stderr = EnvUtil.with_default_internal(pat.encoding) {
+          EnvUtil.verbose_warning {
+            result = yield
+          }
+        }
+        msg = message(msg) {diff pat, stderr}
+        assert(pat === stderr, msg)
+        result
+      end
+
+      def assert_warn(*args)
+        assert_warning(*args) {$VERBOSE = false; yield}
+      end
+
+      def assert_no_warning(pat, msg = nil)
+        result = nil
+        stderr = EnvUtil.verbose_warning {
+          EnvUtil.with_default_internal(pat.encoding) {
+            result = yield
+          }
+        }
+        msg = message(msg) {diff pat, stderr}
+        refute(pat === stderr, msg)
+        result
+      end
+
+      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
+        skip 'assert_no_memory_leak may consider MJIT memory usage as leak' if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
+
+        require_relative '../../memory_status'
+        raise MiniTest::Skip, "unsupported platform" unless defined?(Memory::Status)
+
+        token = "\e[7;1m#{$$.to_s}:#{Time.now.strftime('%s.%L')}:#{rand(0x10000).to_s(16)}:\e[m"
+        token_dump = token.dump
+        token_re = Regexp.quote(token)
+        envs = args.shift if Array === args and Hash === args.first
+        args = [
+          "--disable=gems",
+          "-r", File.expand_path("../../../memory_status", __FILE__),
+          *args,
+          "-v", "-",
+        ]
+        if defined? Memory::NO_MEMORY_LEAK_ENVS then
+          envs ||= {}
+          newenvs = envs.merge(Memory::NO_MEMORY_LEAK_ENVS) { |_, _, _| break }
+          envs = newenvs if newenvs
+        end
+        args.unshift(envs) if envs
+        cmd = [
+          'END {STDERR.puts '"#{token_dump}"'"FINAL=#{Memory::Status.new}"}',
+          prepare,
+          'STDERR.puts('"#{token_dump}"'"START=#{$initial_status = Memory::Status.new}")',
+          '$initial_size = $initial_status.size',
+          code,
+          'GC.start',
+        ].join("\n")
+        _, err, status = EnvUtil.invoke_ruby(args, cmd, true, true, **opt)
+        before = err.sub!(/^#{token_re}START=(\{.*\})\n/, '') && Memory::Status.parse($1)
+        after = err.sub!(/^#{token_re}FINAL=(\{.*\})\n/, '') && Memory::Status.parse($1)
+        assert(status.success?, FailDesc[status, message, err])
+        ([:size, (rss && :rss)] & after.members).each do |n|
+          b = before[n]
+          a = after[n]
+          next unless a > 0 and b > 0
+          assert_operator(a.fdiv(b), :<, limit, message(message) {"#{n}: #{b} => #{a}"})
+        end
+      rescue LoadError
+        skip
+      end
+
+      # kernel resolution can limit the minimum time we can measure
+      # [ruby-core:81540]
+      MIN_HZ = MiniTest::Unit::TestCase.windows? ? 67 : 100
+      MIN_MEASURABLE = 1.0 / MIN_HZ
+
+      def assert_cpu_usage_low(msg = nil, pct: 0.05, wait: 1.0, stop: nil)
+        require 'benchmark'
+
+        wait = EnvUtil.apply_timeout_scale(wait)
+        if wait < 0.1 # TIME_QUANTUM_USEC in thread_pthread.c
+          warn "test #{msg || 'assert_cpu_usage_low'} too short to be accurate"
+        end
+        tms = Benchmark.measure(msg || '') do
+          if stop
+            th = Thread.start {sleep wait; stop.call}
+            yield
+            th.join
+          else
+            begin
+              Timeout.timeout(wait) {yield}
+            rescue Timeout::Error
+            end
+          end
+        end
+
+        max = pct * tms.real
+        min_measurable = MIN_MEASURABLE
+        min_measurable *= 1.30 # add a little (30%) to account for misc. overheads
+        if max < min_measurable
+          max = min_measurable
+        end
+
+        assert_operator tms.total, :<=, max, msg
+      end
+
+      def assert_is_minus_zero(f)
+        assert(1.0/f == -Float::INFINITY, "#{f} is not -0.0")
+      end
+
+      def assert_file
+        AssertFile
+      end
+
+      # pattern_list is an array which contains regexp and :*.
+      # :* means any sequence.
+      #
+      # pattern_list is anchored.
+      # Use [:*, regexp, :*] for non-anchored match.
+      def assert_pattern_list(pattern_list, actual, message=nil)
+        rest = actual
+        anchored = true
+        pattern_list.each_with_index {|pattern, i|
+          if pattern == :*
+            anchored = false
+          else
+            if anchored
+              match = /\A#{pattern}/.match(rest)
+            else
+              match = pattern.match(rest)
+            end
+            unless match
+              msg = message(msg) {
+                expect_msg = "Expected #{mu_pp pattern}\n"
+                if /\n[^\n]/ =~ rest
+                  actual_mesg = +"to match\n"
+                  rest.scan(/.*\n+/) {
+                    actual_mesg << '  ' << $&.inspect << "+\n"
+                  }
+                  actual_mesg.sub!(/\+\n\z/, '')
+                else
+                  actual_mesg = "to match " + mu_pp(rest)
+                end
+                actual_mesg << "\nafter #{i} patterns with #{actual.length - rest.length} characters"
+                expect_msg + actual_mesg
+              }
+              assert false, msg
+            end
+            rest = match.post_match
+            anchored = true
+          end
+        }
+        if anchored
+          assert_equal("", rest)
+        end
+      end
+
+      # threads should respond to shift method.
+      # Array can be used.
+      def assert_join_threads(threads, message = nil)
+        errs = []
+        values = []
+        while th = threads.shift
+          begin
+            values << th.value
+          rescue Exception
+            errs << [th, $!]
+            th = nil
+          end
+        end
+        values
+      ensure
+        if th&.alive?
+          th.raise(Timeout::Error.new)
+          th.join rescue errs << [th, $!]
+        end
+        if !errs.empty?
+          msg = "exceptions on #{errs.length} threads:\n" +
+            errs.map {|t, err|
+            "#{t.inspect}:\n" +
+              err.full_message(highlight: false, order: :top)
+          }.join("\n---\n")
+          if message
+            msg = "#{message}\n#{msg}"
+          end
+          raise MiniTest::Assertion, msg
+        end
+      end
+
+      class << (AssertFile = Struct.new(:failure_message).new)
+        include Assertions
+        def assert_file_predicate(predicate, *args)
+          if /\Anot_/ =~ predicate
+            predicate = $'
+            neg = " not"
+          end
+          result = File.__send__(predicate, *args)
+          result = !result if neg
+          mesg = "Expected file ".dup << args.shift.inspect
+          mesg << "#{neg} to be #{predicate}"
+          mesg << mu_pp(args).sub(/\A\[(.*)\]\z/m, '(\1)') unless args.empty?
+          mesg << " #{failure_message}" if failure_message
+          assert(result, mesg)
+        end
+        alias method_missing assert_file_predicate
+
+        def for(message)
+          clone.tap {|a| a.failure_message = message}
+        end
+      end
+
+      class AllFailures
+        attr_reader :failures
+
+        def initialize
+          @count = 0
+          @failures = {}
+        end
+
+        def for(key)
+          @count += 1
+          yield
+        rescue Exception => e
+          @failures[key] = [@count, e]
+        end
+
+        def foreach(*keys)
+          keys.each do |key|
+            @count += 1
+            begin
+              yield key
+            rescue Exception => e
+              @failures[key] = [@count, e]
+            end
+          end
+        end
+
+        def message
+          i = 0
+          total = @count.to_s
+          fmt = "%#{total.size}d"
+          @failures.map {|k, (n, v)|
+            v = v.message
+            "\n#{i+=1}. [#{fmt%n}/#{total}] Assertion for #{k.inspect}\n#{v.b.gsub(/^/, '   | ').force_encoding(v.encoding)}"
+          }.join("\n")
+        end
+
+        def pass?
+          @failures.empty?
+        end
+      end
+
+      def assert_all_assertions(msg = nil)
+        all = AllFailures.new
+        yield all
+      ensure
+        assert(all.pass?, message(msg) {all.message.chomp(".")})
+      end
+      alias all_assertions assert_all_assertions
+
+      def assert_all_assertions_foreach(msg = nil, *keys, &block)
+        all = AllFailures.new
+        all.foreach(*keys, &block)
+      ensure
+        assert(all.pass?, message(msg) {all.message.chomp(".")})
+      end
+      alias all_assertions_foreach assert_all_assertions_foreach
+
+      def build_message(head, template=nil, *arguments) #:nodoc:
+        template &&= template.chomp
+        template.gsub(/\G((?:[^\\]|\\.)*?)(\\)?\?/) { $1 + ($2 ? "?" : mu_pp(arguments.shift)) }
+      end
+
+      def message(msg = nil, *args, &default) # :nodoc:
+        if Proc === msg
+          super(nil, *args) do
+            ary = [msg.call, (default.call if default)].compact.reject(&:empty?)
+            if 1 < ary.length
+              ary[0...-1] = ary[0...-1].map {|str| str.sub(/(?<!\.)\z/, '.') }
+            end
+            begin
+              ary.join("\n")
+            rescue Encoding::CompatibilityError
+              ary.map(&:b).join("\n")
+            end
+          end
+        else
+          super
+        end
+      end
+    end
+  end
+end