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# encoding: utf-8
# frozen_string_literal: false

require "optparse"
require "rbconfig"
require "leakchecker"

##
# Minimal (mostly drop-in) replacement for test-unit.
#
# :include: README.txt

module MiniTest

  def self.const_missing name # :nodoc:
    case name
    when :MINI_DIR then
      msg = "MiniTest::MINI_DIR was removed. Don't violate other's internals."
      warn "WAR\NING: #{msg}"
      warn "WAR\NING: Used by #{caller.first}."
      const_set :MINI_DIR, "bad value"
    else
      super
    end
  end

  ##
  # Assertion base class

  class Assertion < Exception; end

  ##
  # Assertion raised when skipping a test

  class Skip < Assertion; end

  class << self
    ##
    # Filter object for backtraces.

    attr_accessor :backtrace_filter
  end

  class BacktraceFilter # :nodoc:
    def filter bt
      return ["No backtrace"] unless bt

      new_bt = []

      unless $DEBUG then
        bt.each do |line|
          break if line =~ /lib\/minitest/
          new_bt << line
        end

        new_bt = bt.reject { |line| line =~ /lib\/minitest/ } if new_bt.empty?
        new_bt = bt.dup if new_bt.empty?
      else
        new_bt = bt.dup
      end

      new_bt
    end
  end

  self.backtrace_filter = BacktraceFilter.new

  def self.filter_backtrace bt # :nodoc:
    backtrace_filter.filter bt
  end

  ##
  # MiniTest Assertions.  All assertion methods accept a +msg+ which is
  # printed if the assertion fails.

  module Assertions
    ##
    # Returns the diff command to use in #diff. Tries to intelligently
    # figure out what diff to use.

    def self.diff
      @diff = if (RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ &&
                  system("diff.exe", __FILE__, __FILE__)) then
                "diff.exe -u"
              elsif Minitest::Unit::Guard.maglev? then # HACK
                "diff -u"
              elsif system("gdiff", __FILE__, __FILE__)
                "gdiff -u" # solaris and kin suck
              elsif system("diff", __FILE__, __FILE__)
                "diff -u"
              else
                nil
              end unless defined? @diff

      @diff
    end

    ##
    # Set the diff command to use in #diff.

    def self.diff= o
      @diff = o
    end

    ##
    # Returns a diff between +exp+ and +act+. If there is no known
    # diff command or if it doesn't make sense to diff the output
    # (single line, short output), then it simply returns a basic
    # comparison between the two.

    def diff exp, act
      require "tempfile"

      expect = mu_pp_for_diff exp
      butwas = mu_pp_for_diff act
      result = nil

      need_to_diff =
        MiniTest::Assertions.diff &&
        (expect.include?("\n")    ||
         butwas.include?("\n")    ||
         expect.size > 30         ||
         butwas.size > 30         ||
         expect == butwas)

      return "Expected: #{mu_pp exp}\n  Actual: #{mu_pp act}" unless
        need_to_diff

      tempfile_a = nil
      tempfile_b = nil

      Tempfile.open("expect") do |a|
        tempfile_a = a
        a.puts expect
        a.flush

        Tempfile.open("butwas") do |b|
          tempfile_b = b
          b.puts butwas
          b.flush

          result = `#{MiniTest::Assertions.diff} #{a.path} #{b.path}`
          result.sub!(/^\-\-\- .+/, "--- expected")
          result.sub!(/^\+\+\+ .+/, "+++ actual")

          if result.empty? then
            klass = exp.class
            result = [
                      "No visible difference in the #{klass}#inspect output.\n",
                      "You should look at the implementation of #== on ",
                      "#{klass} or its members.\n",
                      expect,
                     ].join
          end
        end
      end

      result
    ensure
      tempfile_a.close! if tempfile_a
      tempfile_b.close! if tempfile_b
    end

    ##
    # This returns a human-readable version of +obj+. By default
    # #inspect is called. You can override this to use #pretty_print
    # if you want.

    def mu_pp obj
      s = obj.inspect
      s = s.encode Encoding.default_external if defined? Encoding
      s
    end

    ##
    # This returns a diff-able human-readable version of +obj+. This
    # differs from the regular mu_pp because it expands escaped
    # newlines and makes hex-values generic (like object_ids). This
    # uses mu_pp to do the first pass and then cleans it up.

    def mu_pp_for_diff obj
      mu_pp(obj).gsub(/\\n/, "\n").gsub(/:0x[a-fA-F0-9]{4,}/m, ':0xXXXXXX')
    end

    def _assertions= n # :nodoc:
      @_assertions = n
    end

    def _assertions # :nodoc:
      @_assertions ||= 0
    end

    ##
    # Fails unless +test+ is a true value.

    def assert test, msg = nil
      msg ||= "Failed assertion, no message given."
      self._assertions += 1
      unless test then
        msg = msg.call if Proc === msg
        raise MiniTest::Assertion, msg
      end
      true
    end

    ##
    # Fails unless +obj+ is empty.

    def assert_empty obj, msg = nil
      msg = message(msg) { "Expected #{mu_pp(obj)} to be empty" }
      assert_respond_to obj, :empty?
      assert obj.empty?, msg
    end

    ##
    # Fails unless <tt>exp == act</tt> printing the difference between
    # the two, if possible.
    #
    # If there is no visible difference but the assertion fails, you
    # should suspect that your #== is buggy, or your inspect output is
    # missing crucial details.
    #
    # For floats use assert_in_delta.
    #
    # See also: MiniTest::Assertions.diff

    def assert_equal exp, act, msg = nil
      msg = message(msg, "") { diff exp, act }
      assert exp == act, msg
    end

    ##
    # For comparing Floats.  Fails unless +exp+ and +act+ are within +delta+
    # of each other.
    #
    #   assert_in_delta Math::PI, (22.0 / 7.0), 0.01

    def assert_in_delta exp, act, delta = 0.001, msg = nil
      n = (exp - act).abs
      msg = message(msg) {
        "Expected |#{exp} - #{act}| (#{n}) to be <= #{delta}"
      }
      assert delta >= n, msg
    end

    ##
    # For comparing Floats.  Fails unless +exp+ and +act+ have a relative
    # error less than +epsilon+.

    def assert_in_epsilon a, b, epsilon = 0.001, msg = nil
      assert_in_delta a, b, [a.abs, b.abs].min * epsilon, msg
    end

    ##
    # Fails unless +collection+ includes +obj+.

    def assert_includes collection, obj, msg = nil
      msg = message(msg) {
        "Expected #{mu_pp(collection)} to include #{mu_pp(obj)}"
      }
      assert_respond_to collection, :include?
      assert collection.include?(obj), msg
    end

    ##
    # Fails unless +obj+ is an instance of +cls+.

    def assert_instance_of cls, obj, msg = nil
      msg = message(msg) {
        "Expected #{mu_pp(obj)} to be an instance of #{cls}, not #{obj.class}"
      }

      assert obj.instance_of?(cls), msg
    end

    ##
    # Fails unless +obj+ is a kind of +cls+.

    def assert_kind_of cls, obj, msg = nil # TODO: merge with instance_of
      msg = message(msg) {
        "Expected #{mu_pp(obj)} to be a kind of #{cls}, not #{obj.class}" }

      assert obj.kind_of?(cls), msg
    end

    ##
    # Fails unless +matcher+ <tt>=~</tt> +obj+.

    def assert_match matcher, obj, msg = nil
      msg = message(msg) { "Expected #{mu_pp matcher} to match #{mu_pp obj}" }
      assert_respond_to matcher, :"=~"
      matcher = Regexp.new Regexp.escape matcher if String === matcher
      assert matcher =~ obj, msg
    end

    ##
    # Fails unless +obj+ is nil

    def assert_nil obj, msg = nil
      msg = message(msg) { "Expected #{mu_pp(obj)} to be nil" }
      assert obj.nil?, msg
    end

    ##
    # For testing with binary operators.
    #
    #   assert_operator 5, :<=, 4

    def assert_operator o1, op, o2 = (predicate = true; nil), msg = nil
      return assert_predicate o1, op, msg if predicate
      msg = message(msg) { "Expected #{mu_pp(o1)} to be #{op} #{mu_pp(o2)}" }
      assert o1.__send__(op, o2), msg
    end

    ##
    # Fails if stdout or stderr do not output the expected results.
    # Pass in nil if you don't care about that streams output. Pass in
    # "" if you require it to be silent. Pass in a regexp if you want
    # to pattern match.
    #
    # NOTE: this uses #capture_io, not #capture_subprocess_io.
    #
    # See also: #assert_silent

    def assert_output stdout = nil, stderr = nil
      out, err = capture_io do
        yield
      end

      err_msg = Regexp === stderr ? :assert_match : :assert_equal if stderr
      out_msg = Regexp === stdout ? :assert_match : :assert_equal if stdout

      y = send err_msg, stderr, err, "In stderr" if err_msg
      x = send out_msg, stdout, out, "In stdout" if out_msg

      (!stdout || x) && (!stderr || y)
    end

    ##
    # For testing with predicates.
    #
    #   assert_predicate str, :empty?
    #
    # This is really meant for specs and is front-ended by assert_operator:
    #
    #   str.must_be :empty?

    def assert_predicate o1, op, msg = nil
      msg = message(msg) { "Expected #{mu_pp(o1)} to be #{op}" }
      assert o1.__send__(op), msg
    end

    ##
    # Fails unless the block raises one of +exp+. Returns the
    # exception matched so you can check the message, attributes, etc.

    def assert_raises *exp
      msg = "#{exp.pop}.\n" if String === exp.last

      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, "#{msg}#{mu_pp(exp)} exception expected, not")
        }

        return e
      end

      exp = exp.first if exp.size == 1

      flunk "#{msg}#{mu_pp(exp)} expected but nothing was raised."
    end

    ##
    # Fails unless +obj+ responds to +meth+.

    def assert_respond_to obj, meth, msg = nil
      msg = message(msg) {
        "Expected #{mu_pp(obj)} (#{obj.class}) to respond to ##{meth}"
      }
      assert obj.respond_to?(meth), msg
    end

    ##
    # Fails unless +exp+ and +act+ are #equal?

    def assert_same exp, act, msg = nil
      msg = message(msg) {
        data = [mu_pp(act), act.object_id, mu_pp(exp), exp.object_id]
        "Expected %s (oid=%d) to be the same as %s (oid=%d)" % data
      }
      assert exp.equal?(act), msg
    end

    ##
    # +send_ary+ is a receiver, message and arguments.
    #
    # Fails unless the call returns a true value
    # TODO: I should prolly remove this from specs

    def assert_send send_ary, m = nil
      recv, msg, *args = send_ary
      m = message(m) {
        "Expected #{mu_pp(recv)}.#{msg}(*#{mu_pp(args)}) to return true" }
      assert recv.__send__(msg, *args), m
    end

    ##
    # Fails if the block outputs anything to stderr or stdout.
    #
    # See also: #assert_output

    def assert_silent
      assert_output "", "" do
        yield
      end
    end

    ##
    # Fails unless the block throws +sym+

    def assert_throws sym, msg = nil
      default = "Expected #{mu_pp(sym)} to have been thrown"
      caught = true
      catch(sym) do
        begin
          yield
        rescue ThreadError => e       # wtf?!? 1.8 + threads == suck
          default += ", not \:#{e.message[/uncaught throw \`(\w+?)\'/, 1]}"
        rescue ArgumentError => e     # 1.9 exception
          default += ", not #{e.message.split(/ /).last}"
        rescue NameError => e         # 1.8 exception
          default += ", not #{e.name.inspect}"
        end
        caught = false
      end

      assert caught, message(msg) { default }
    end

    ##
    # Captures $stdout and $stderr into strings:
    #
    #   out, err = capture_io do
    #     puts "Some info"
    #     warn "You did a bad thing"
    #   end
    #
    #   assert_match %r%info%, out
    #   assert_match %r%bad%, err
    #
    # NOTE: For efficiency, this method uses StringIO and does not
    # capture IO for subprocesses. Use #capture_subprocess_io for
    # that.

    def capture_io
      require 'stringio'

      captured_stdout, captured_stderr = StringIO.new, StringIO.new

      synchronize do
        orig_stdout, orig_stderr = $stdout, $stderr
        $stdout, $stderr         = captured_stdout, captured_stderr

        begin
          yield
        ensure
          $stdout = orig_stdout
          $stderr = orig_stderr
        end
      end

      return captured_stdout.string, captured_stderr.string
    end

    ##
    # Captures $stdout and $stderr into strings, using Tempfile to
    # ensure that subprocess IO is captured as well.
    #
    #   out, err = capture_subprocess_io do
    #     system "echo Some info"
    #     system "echo You did a bad thing 1>&2"
    #   end
    #
    #   assert_match %r%info%, out
    #   assert_match %r%bad%, err
    #
    # NOTE: This method is approximately 10x slower than #capture_io so
    # only use it when you need to test the output of a subprocess.

    def capture_subprocess_io
      require 'tempfile'

      captured_stdout, captured_stderr = Tempfile.new("out"), Tempfile.new("err")

      synchronize do
        orig_stdout, orig_stderr = $stdout.dup, $stderr.dup
        $stdout.reopen captured_stdout
        $stderr.reopen captured_stderr

        begin
          yield

          $stdout.rewind
          $stderr.rewind

          [captured_stdout.read, captured_stderr.read]
        ensure
          $stdout.reopen orig_stdout
          $stderr.reopen orig_stderr
          orig_stdout.close
          orig_stderr.close
          captured_stdout.close!
          captured_stderr.close!
        end
      end
    end

    ##
    # Returns details for exception +e+

    def exception_details e, msg
      [
       "#{msg}",
       "Class: <#{e.class}>",
       "Message: <#{e.message.inspect}>",
       "---Backtrace---",
       "#{MiniTest::filter_backtrace(e.backtrace).join("\n")}",
       "---------------",
      ].join "\n"
    end

    ##
    # Fails with +msg+

    def flunk msg = nil
      msg ||= "Epic Fail!"
      assert false, msg
    end

    ##
    # Returns a proc that will output +msg+ along with the default message.

    def message msg = nil, ending = ".", &default
      proc {
        msg = msg.call.chomp(".") if Proc === msg
        custom_message = "#{msg}.\n" unless msg.nil? or msg.to_s.empty?
        "#{custom_message}#{default.call}#{ending}"
      }
    end

    ##
    # used for counting assertions

    def pass msg = nil
      assert true
    end

    ##
    # Fails if +test+ is a true value

    def refute test, msg = nil
      msg ||= "Failed refutation, no message given"
      not assert(! test, msg)
    end

    ##
    # Fails if +obj+ is empty.

    def refute_empty obj, msg = nil
      msg = message(msg) { "Expected #{mu_pp(obj)} to not be empty" }
      assert_respond_to obj, :empty?
      refute obj.empty?, msg
    end

    ##
    # Fails if <tt>exp == act</tt>.
    #
    # For floats use refute_in_delta.

    def refute_equal exp, act, msg = nil
      msg = message(msg) {
        "Expected #{mu_pp(act)} to not be equal to #{mu_pp(exp)}"
      }
      refute exp == act, msg
    end

    ##
    # For comparing Floats.  Fails if +exp+ is within +delta+ of +act+.
    #
    #   refute_in_delta Math::PI, (22.0 / 7.0)

    def refute_in_delta exp, act, delta = 0.001, msg = nil
      n = (exp - act).abs
      msg = message(msg) {
        "Expected |#{exp} - #{act}| (#{n}) to not be <= #{delta}"
      }
      refute delta >= n, msg
    end

    ##
    # For comparing Floats.  Fails if +exp+ and +act+ have a relative error
    # less than +epsilon+.

    def refute_in_epsilon a, b, epsilon = 0.001, msg = nil
      refute_in_delta a, b, a * epsilon, msg
    end

    ##
    # Fails if +collection+ includes +obj+.

    def refute_includes collection, obj, msg = nil
      msg = message(msg) {
        "Expected #{mu_pp(collection)} to not include #{mu_pp(obj)}"
      }
      assert_respond_to collection, :include?
      refute collection.include?(obj), msg
    end

    ##
    # Fails if +obj+ is an instance of +cls+.

    def refute_instance_of cls, obj, msg = nil
      msg = message(msg) {
        "Expected #{mu_pp(obj)} to not be an instance of #{cls}"
      }
      refute obj.instance_of?(cls), msg
    end

    ##
    # Fails if +obj+ is a kind of +cls+.

    def refute_kind_of cls, obj, msg = nil # TODO: merge with instance_of
      msg = message(msg) { "Expected #{mu_pp(obj)} to not be a kind of #{cls}" }
      refute obj.kind_of?(cls), msg
    end

    ##
    # Fails if +matcher+ <tt>=~</tt> +obj+.

    def refute_match matcher, obj, msg = nil
      msg = message(msg) {"Expected #{mu_pp matcher} to not match #{mu_pp obj}"}
      assert_respond_to matcher, :"=~"
      matcher = Regexp.new Regexp.escape matcher if String === matcher
      refute matcher =~ obj, msg
    end

    ##
    # Fails if +obj+ is nil.

    def refute_nil obj, msg = nil
      msg = message(msg) { "Expected #{mu_pp(obj)} to not be nil" }
      refute obj.nil?, msg
    end

    ##
    # Fails if +o1+ is not +op+ +o2+. Eg:
    #
    #   refute_operator 1, :>, 2 #=> pass
    #   refute_operator 1, :<, 2 #=> fail

    def refute_operator o1, op, o2 = (predicate = true; nil), msg = nil
      return refute_predicate o1, op, msg if predicate
      msg = message(msg) { "Expected #{mu_pp(o1)} to not be #{op} #{mu_pp(o2)}"}
      refute o1.__send__(op, o2), msg
    end

    ##
    # For testing with predicates.
    #
    #   refute_predicate str, :empty?
    #
    # This is really meant for specs and is front-ended by refute_operator:
    #
    #   str.wont_be :empty?

    def refute_predicate o1, op, msg = nil
      msg = message(msg) { "Expected #{mu_pp(o1)} to not be #{op}" }
      refute o1.__send__(op), msg
    end

    ##
    # Fails if +obj+ responds to the message +meth+.

    def refute_respond_to obj, meth, msg = nil
      msg = message(msg) { "Expected #{mu_pp(obj)} to not respond to #{meth}" }

      refute obj.respond_to?(meth), msg
    end

    ##
    # Fails if +exp+ is the same (by object identity) as +act+.

    def refute_same exp, act, msg = nil
      msg = message(msg) {
        data = [mu_pp(act), act.object_id, mu_pp(exp), exp.object_id]
        "Expected %s (oid=%d) to not be the same as %s (oid=%d)" % data
      }
      refute exp.equal?(act), msg
    end

    ##
    # Skips the current test. Gets listed at the end of the run but
    # doesn't cause a failure exit code.

    def skip msg = nil, bt = caller
      msg ||= "Skipped, no message given"
      @skip = true
      raise MiniTest::Skip, msg, bt
    end

    ##
    # Was this testcase skipped? Meant for #teardown.

    def skipped?
      defined?(@skip) and @skip
    end

    ##
    # Takes a block and wraps it with the runner's shared mutex.

    def synchronize
      Minitest::Unit.runner.synchronize do
        yield
      end
    end
  end

  class Unit # :nodoc:
    VERSION = "4.7.5" # :nodoc:

    attr_accessor :report, :failures, :errors, :skips # :nodoc:
    attr_accessor :assertion_count                    # :nodoc:
    attr_writer   :test_count                         # :nodoc:
    attr_accessor :start_time                         # :nodoc:
    attr_accessor :help                               # :nodoc:
    attr_accessor :verbose                            # :nodoc:
    attr_writer   :options                            # :nodoc:

    ##
    # :attr:
    #
    # if true, installs an "INFO" signal handler (only available to BSD and
    # OS X users) which prints diagnostic information about the test run.
    #
    # This is auto-detected by default but may be overridden by custom
    # runners.

    attr_accessor :info_signal

    ##
    # Lazy accessor for options.

    def options
      @options ||= {}
    end

    @@installed_at_exit ||= false
    @@out = $stdout
    @@after_tests = []

    ##
    # A simple hook allowing you to run a block of code after _all_ of
    # the tests are done. Eg:
    #
    #   MiniTest::Unit.after_tests { p $debugging_info }

    def self.after_tests &block
      @@after_tests << block
    end

    ##
    # Registers MiniTest::Unit to run tests at process exit

    def self.autorun
      at_exit {
        # don't run if there was a non-exit exception
        next if $! and not $!.kind_of? SystemExit

        # the order here is important. The at_exit handler must be
        # installed before anyone else gets a chance to install their
        # own, that way we can be assured that our exit will be last
        # to run (at_exit stacks).
        exit_code = nil

        at_exit {
          @@after_tests.reverse_each(&:call)
          exit false if exit_code && exit_code != 0
        }

        exit_code = MiniTest::Unit.new.run ARGV
      } unless @@installed_at_exit
      @@installed_at_exit = true
    end

    ##
    # Returns the stream to use for output.

    def self.output
      @@out
    end

    ##
    # Sets MiniTest::Unit to write output to +stream+.  $stdout is the default
    # output

    def self.output= stream
      @@out = stream
    end

    ##
    # Tells MiniTest::Unit to delegate to +runner+, an instance of a
    # MiniTest::Unit subclass, when MiniTest::Unit#run is called.

    def self.runner= runner
      @@runner = runner
    end

    ##
    # Returns the MiniTest::Unit subclass instance that will be used
    # to run the tests. A MiniTest::Unit instance is the default
    # runner.

    def self.runner
      @@runner ||= self.new
    end

    ##
    # Return all plugins' run methods (methods that start with "run_").

    def self.plugins
      @@plugins ||= (["run_tests"] +
                     public_instance_methods(false).
                     grep(/^run_/).map { |s| s.to_s }).uniq
    end

    ##
    # Return the IO for output.

    def output
      self.class.output
    end

    def puts *a  # :nodoc:
      output.puts(*a)
    end

    def print *a # :nodoc:
      output.print(*a)
    end

    def test_count # :nodoc:
      @test_count ||= 0
    end

    ##
    # Runner for a given +type+ (eg, test vs bench).

    def _run_anything type
      suites = TestCase.send "#{type}_suites"
      return if suites.empty?

      puts
      puts "# Running #{type}s:"
      puts

      @test_count, @assertion_count = 0, 0
      test_count = assertion_count = 0
      sync = output.respond_to? :"sync=" # stupid emacs
      old_sync, output.sync = output.sync, true if sync

      count = 0
      begin
        start = Time.now

        results = _run_suites suites, type

        @test_count      = results.inject(0) { |sum, (tc, _)| sum + tc }
        @assertion_count = results.inject(0) { |sum, (_, ac)| sum + ac }
        test_count      += @test_count
        assertion_count += @assertion_count
        t = Time.now - start
        count += 1
        unless @repeat_count
          puts
          puts
        end
        puts "Finished%s %ss in %.6fs, %.4f tests/s, %.4f assertions/s.\n" %
             [(@repeat_count ? "(#{count}/#{@repeat_count}) " : ""), type,
               t, @test_count.fdiv(t), @assertion_count.fdiv(t)]
      end while @repeat_count && count < @repeat_count && report.empty?

      output.sync = old_sync if sync

      report.each_with_index do |msg, i|
        puts "\n%3d) %s" % [i + 1, msg]
      end

      puts
      @test_count      = test_count
      @assertion_count = assertion_count

      status
    end

    ##
    # Runs all the +suites+ for a given +type+.
    #

    def _run_suites suites, type
      suites.map { |suite| _run_suite suite, type }
    end

    ##
    # Run a single +suite+ for a given +type+.

    def _run_suite suite, type
      header = "#{type}_suite_header"
      puts send(header, suite) if respond_to? header

      filter = options[:filter] || '/./'
      filter = Regexp.new $1 if filter =~ /\/(.*)\//

      all_test_methods = suite.send "#{type}_methods"

      filtered_test_methods = all_test_methods.find_all { |m|
        filter === m || filter === "#{suite}##{m}"
      }

      leakchecker = LeakChecker.new

      assertions = filtered_test_methods.map { |method|
        inst = suite.new method
        inst._assertions = 0

        print "#{suite}##{method} = " if @verbose

        start_time = Time.now if @verbose
        result = inst.run self

        print "%.2f s = " % (Time.now - start_time) if @verbose
        print result
        puts if @verbose
        $stdout.flush

        leakchecker.check("#{inst.class}\##{inst.__name__}")

        inst._assertions
      }

      return assertions.size, assertions.inject(0) { |sum, n| sum + n }
    end

    ##
    # Record the result of a single test. Makes it very easy to gather
    # information. Eg:
    #
    #   class StatisticsRecorder < MiniTest::Unit
    #     def record suite, method, assertions, time, error
    #       # ... record the results somewhere ...
    #     end
    #   end
    #
    #   MiniTest::Unit.runner = StatisticsRecorder.new
    #
    # NOTE: record might be sent more than once per test.  It will be
    # sent once with the results from the test itself.  If there is a
    # failure or error in teardown, it will be sent again with the
    # error or failure.

    def record suite, method, assertions, time, error
    end

    def location e # :nodoc:
      last_before_assertion = ""
      e.backtrace.reverse_each do |s|
        break if s =~ /in .(assert|refute|flunk|pass|fail|raise|must|wont)/
        last_before_assertion = s
      end
      last_before_assertion.sub(/:in .*$/, '')
    end

    ##
    # Writes status for failed test +meth+ in +klass+ which finished with
    # exception +e+

    def puke klass, meth, e
      e = case e
          when MiniTest::Skip then
            @skips += 1
            return "S" unless @verbose
            "Skipped:\n#{klass}##{meth} [#{location e}]:\n#{e.message}\n"
          when MiniTest::Assertion then
            @failures += 1
            "Failure:\n#{klass}##{meth} [#{location e}]:\n#{e.message}\n"
          else
            @errors += 1
            bt = MiniTest::filter_backtrace(e.backtrace).join "\n    "
            "Error:\n#{klass}##{meth}:\n#{e.class}: #{e.message.b}\n    #{bt}\n"
          end
      @report << e
      e[0, 1]
    end

    def initialize # :nodoc:
      @report = []
      @errors = @failures = @skips = 0
      @verbose = false
      @mutex = Thread::Mutex.new
      @info_signal = Signal.list['INFO']
      @repeat_count = nil
    end

    def synchronize # :nodoc:
      if @mutex then
        @mutex.synchronize { yield }
      else
        yield
      end
    end

    def process_args args = [] # :nodoc:
      options = {}
      orig_args = args.dup

      OptionParser.new do |opts|
        opts.banner  = 'minitest options:'
        opts.version = MiniTest::Unit::VERSION

        opts.on '-h', '--help', 'Display this help.' do
          puts opts
          exit
        end

        opts.on '-s', '--seed SEED', Integer, "Sets random seed" do |m|
          options[:seed] = m.to_i
        end

        opts.on '-v', '--verbose', "Verbose. Show progress processing files." do
          options[:verbose] = true
        end

        opts.on '-n', '--name PATTERN', "Filter test names on pattern (e.g. /foo/)" do |a|
          options[:filter] = a
        end

        opts.parse! args
        orig_args -= args
      end

      unless options[:seed] then
        srand
        options[:seed] = srand % 0xFFFF
        orig_args << "--seed" << options[:seed].to_s
      end

      srand options[:seed]

      self.verbose = options[:verbose]
      @help = orig_args.map { |s| s =~ /[\s|&<>$()]/ ? s.inspect : s }.join " "

      options
    end

    ##
    # Begins the full test run. Delegates to +runner+'s #_run method.

    def run args = []
      self.class.runner._run(args)
    end

    ##
    # Top level driver, controls all output and filtering.

    def _run args = []
      args = process_args args # ARGH!! blame test/unit process_args
      self.options.merge! args

      puts "Run options: #{help}"

      self.class.plugins.each do |plugin|
        send plugin
        break unless report.empty?
      end

      return failures + errors if self.test_count > 0 # or return nil...
    rescue Interrupt
      abort 'Interrupted'
    end

    ##
    # Runs test suites matching +filter+.

    def run_tests
      _run_anything :test
    end

    ##
    # Writes status to +io+

    def status io = self.output
      format = "%d tests, %d assertions, %d failures, %d errors, %d skips"
      io.puts format % [test_count, assertion_count, failures, errors, skips]
    end

    ##
    # Provides a simple set of guards that you can use in your tests
    # to skip execution if it is not applicable. These methods are
    # mixed into TestCase as both instance and class methods so you
    # can use them inside or outside of the test methods.
    #
    #   def test_something_for_mri
    #     skip "bug 1234"  if jruby?
    #     # ...
    #   end
    #
    #   if windows? then
    #     # ... lots of test methods ...
    #   end

    module Guard

      ##
      # Is this running on jruby?

      def jruby? platform = RUBY_PLATFORM
        "java" == platform
      end

      ##
      # Is this running on mri?

      def maglev? platform = defined?(RUBY_ENGINE) && RUBY_ENGINE
        "maglev" == platform
      end

      module_function :maglev?

      ##
      # Is this running on mri?

      def mri? platform = RUBY_DESCRIPTION
        /^ruby/ =~ platform
      end

      ##
      # Is this running on rubinius?

      def rubinius? platform = defined?(RUBY_ENGINE) && RUBY_ENGINE
        "rbx" == platform
      end

      ##
      # Is this running on windows?

      def windows? platform = RUBY_PLATFORM
        /mswin|mingw/ =~ platform
      end
    end

    ##
    # Provides before/after hooks for setup and teardown. These are
    # meant for library writers, NOT for regular test authors. See
    # #before_setup for an example.

    module LifecycleHooks
      ##
      # Runs before every test, after setup. This hook is meant for
      # libraries to extend minitest. It is not meant to be used by
      # test developers.
      #
      # See #before_setup for an example.

      def after_setup; end

      ##
      # Runs before every test, before setup. This hook is meant for
      # libraries to extend minitest. It is not meant to be used by
      # test developers.
      #
      # As a simplistic example:
      #
      #   module MyMinitestPlugin
      #     def before_setup
      #       super
      #       # ... stuff to do before setup is run
      #     end
      #
      #     def after_setup
      #       # ... stuff to do after setup is run
      #       super
      #     end
      #
      #     def before_teardown
      #       super
      #       # ... stuff to do before teardown is run
      #     end
      #
      #     def after_teardown
      #       # ... stuff to do after teardown is run
      #       super
      #     end
      #   end
      #
      #   class MiniTest::Unit::TestCase
      #     include MyMinitestPlugin
      #   end

      def before_setup; end

      ##
      # Runs after every test, before teardown. This hook is meant for
      # libraries to extend minitest. It is not meant to be used by
      # test developers.
      #
      # See #before_setup for an example.

      def before_teardown; end

      ##
      # Runs after every test, after teardown. This hook is meant for
      # libraries to extend minitest. It is not meant to be used by
      # test developers.
      #
      # See #before_setup for an example.

      def after_teardown; end
    end

    ##
    # Subclass TestCase to create your own tests. Typically you'll want a
    # TestCase subclass per implementation class.
    #
    # See MiniTest::Assertions

    class TestCase
      include LifecycleHooks
      include Guard
      extend Guard

      attr_reader :__name__ # :nodoc:

      PASSTHROUGH_EXCEPTIONS = [NoMemoryError, SignalException,
                                Interrupt, SystemExit] # :nodoc:

      ##
      # Runs the tests reporting the status to +runner+

      def run runner
        trap "INFO" do
          runner.report.each_with_index do |msg, i|
            warn "\n%3d) %s" % [i + 1, msg]
          end
          warn ''
          time = runner.start_time ? Time.now - runner.start_time : 0
          warn "Current Test: %s#%s %.2fs" % [self.class, self.__name__, time]
          runner.status $stderr
        end if runner.info_signal

        start_time = Time.now

        result = ""
        begin
          @passed = nil
          self.before_setup
          self.setup
          self.after_setup
          self.run_test self.__name__
          result = "." unless io?
          time = Time.now - start_time
          runner.record self.class, self.__name__, self._assertions, time, nil
          @passed = true
        rescue *PASSTHROUGH_EXCEPTIONS
          raise
        rescue Exception => e
          @passed = Skip === e
          time = Time.now - start_time
          runner.record self.class, self.__name__, self._assertions, time, e
          result = runner.puke self.class, self.__name__, e
        ensure
          %w{ before_teardown teardown after_teardown }.each do |hook|
            begin
              self.send hook
            rescue *PASSTHROUGH_EXCEPTIONS
              raise
            rescue Exception => e
              @passed = false
              runner.record self.class, self.__name__, self._assertions, time, e
              result = runner.puke self.class, self.__name__, e
            end
          end
          trap 'INFO', 'DEFAULT' if runner.info_signal
        end
        result
      end

      alias :run_test :__send__

      def initialize name # :nodoc:
        @__name__ = name
        @__io__ = nil
        @passed = nil
        @@current = self # FIX: make thread local
      end

      def self.current # :nodoc:
        @@current # FIX: make thread local
      end

      ##
      # Return the output IO object

      def io
        @__io__ = true
        MiniTest::Unit.output
      end

      ##
      # Have we hooked up the IO yet?

      def io?
        @__io__
      end

      def self.reset # :nodoc:
        @@test_suites = {}
      end

      reset

      ##
      # Make diffs for this TestCase use #pretty_inspect so that diff
      # in assert_equal can be more details. NOTE: this is much slower
      # than the regular inspect but much more usable for complex
      # objects.

      def self.make_my_diffs_pretty!
        require 'pp'

        define_method :mu_pp do |o|
          o.pretty_inspect
        end
      end

      def self.inherited klass # :nodoc:
        @@test_suites[klass] = true
        super
      end

      def self.test_order # :nodoc:
        :random
      end

      def self.test_suites # :nodoc:
        @@test_suites.keys.sort_by { |ts| ts.name.to_s }
      end

      def self.test_methods # :nodoc:
        methods = public_instance_methods(true).grep(/^test/).map { |m| m.to_s }

        case self.test_order
        when :parallel
          max = methods.size
          ParallelEach.new methods.sort.sort_by { rand max }
        when :random then
          max = methods.size
          methods.sort.sort_by { rand max }
        when :alpha, :sorted then
          methods.sort
        else
          raise "Unknown test_order: #{self.test_order.inspect}"
        end
      end

      ##
      # Returns true if the test passed.

      def passed?
        @passed
      end

      ##
      # Runs before every test. Use this to set up before each test
      # run.

      def setup; end

      ##
      # Runs after every test. Use this to clean up after each test
      # run.

      def teardown; end

      include MiniTest::Assertions
    end # class TestCase
  end # class Unit

  Test = Unit::TestCase
end # module MiniTest

Minitest = MiniTest # :nodoc: because ugh... I typo this all the time