module Minitest::Assertions

def self.diff

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

def self.diff= o

def self.diff= o
  @diff = o
end

def _synchronize # :nodoc:

:nodoc:
def _synchronize # :nodoc:
  yield
end

def assert test, msg = nil

def assert test, msg = nil
  self.assertions += 1
  unless test then
    msg ||= "Expected #{mu_pp test} to be truthy."
    msg = msg.call if Proc === msg
    raise Minitest::Assertion, msg
  end
  true
end

def assert_empty obj, msg = nil

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

def assert_equal exp, act, msg = nil

def assert_equal exp, act, msg = nil
  msg = message(msg, E) { diff exp, act }
  result = assert exp == act, msg
  if nil == exp then
    if Minitest::VERSION =~ /^6/ then
      refute_nil exp, "Use assert_nil if expecting nil."
    else
      where = Minitest.filter_backtrace(caller).first
      where = where.split(/:in /, 2).first # clean up noise
      warn "DEPRECATED: Use assert_nil if expecting nil from #{where}. This will fail in Minitest 6."
    end
  end
  result
end

def assert_in_delta exp, act, delta = 0.001, msg = nil

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

def assert_in_epsilon exp, act, epsilon = 0.001, msg = nil

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

def assert_includes collection, obj, msg = nil

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

def assert_instance_of cls, obj, msg = nil

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

def assert_kind_of cls, obj, msg = nil

def assert_kind_of cls, obj, msg = nil
  msg = message(msg) {
    "Expected #{mu_pp(obj)} to be a kind of #{cls}, not #{obj.class}" }
  assert obj.kind_of?(cls), msg
end

def assert_match matcher, obj, msg = nil

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

def assert_mock mock

def assert_mock mock
  assert mock.verify
end

def assert_nil obj, msg = nil

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

def assert_operator o1, op, o2 = UNDEFINED, msg = nil

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

def assert_output stdout = nil, stderr = nil

def assert_output stdout = nil, stderr = nil
  flunk "assert_output requires a block to capture output." unless
    block_given?
  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

def assert_predicate o1, op, msg = nil

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

def assert_raises *exp

def assert_raises *exp
  flunk "assert_raises requires a block to capture errors." unless
    block_given?
  msg = "#{exp.pop}.\n" if String === exp.last
  exp << StandardError if exp.empty?
  begin
    yield
  rescue *exp => e
    pass # count assertion
    return e
  rescue Minitest::Skip, Minitest::Assertion
    # don't count assertion
    raise
  rescue SignalException, SystemExit
    raise
  rescue Exception => e
    flunk proc {
      exception_details(e, "#{msg}#{mu_pp(exp)} exception expected, not")
    }
  end
  exp = exp.first if exp.size == 1
  flunk "#{msg}#{mu_pp(exp)} expected but nothing was raised."
end

def assert_respond_to obj, meth, msg = nil

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

def assert_same exp, act, msg = nil

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

def assert_send send_ary, m = nil

def assert_send send_ary, m = nil
  where = Minitest.filter_backtrace(caller).first
  where = where.split(/:in /, 2).first # clean up noise
  warn "DEPRECATED: assert_send. From #{where}"
  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

def assert_silent

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

def assert_throws sym, msg = nil

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
      raise e unless e.message.include?("uncaught throw")
      default += ", not #{e.message.split(/ /).last}"
    rescue NameError => e         # 1.8 exception
      raise e unless e.name == sym
      default += ", not #{e.name.inspect}"
    end
    caught = false
  end
  assert caught, message(msg) { default }
end

def capture_io

def capture_io
  _synchronize do
    begin
      captured_stdout, captured_stderr = StringIO.new, StringIO.new
      orig_stdout, orig_stderr = $stdout, $stderr
      $stdout, $stderr         = captured_stdout, captured_stderr
      yield
      return captured_stdout.string, captured_stderr.string
    ensure
      $stdout = orig_stdout
      $stderr = orig_stderr
    end
  end
end

def capture_subprocess_io

def capture_subprocess_io
  _synchronize do
    begin
      require "tempfile"
      captured_stdout, captured_stderr = Tempfile.new("out"), Tempfile.new("err")
      orig_stdout, orig_stderr = $stdout.dup, $stderr.dup
      $stdout.reopen captured_stdout
      $stderr.reopen captured_stderr
      yield
      $stdout.rewind
      $stderr.rewind
      return captured_stdout.read, captured_stderr.read
    ensure
      captured_stdout.unlink
      captured_stderr.unlink
      $stdout.reopen orig_stdout
      $stderr.reopen orig_stderr
    end
  end
end

def diff exp, act

def diff exp, act
  expect = mu_pp_for_diff exp
  butwas = mu_pp_for_diff act
  result = nil
  e1, e2 = expect.include?("\n"), expect.include?("\\n")
  b1, b2 = butwas.include?("\n"), butwas.include?("\\n")
  need_to_diff =
    (e1 ^ e2           ||
     b1 ^ b2           ||
     expect.size > 30  ||
     butwas.size > 30  ||
     expect == butwas) &&
    Minitest::Assertions.diff
  return "Expected: #{mu_pp exp}\n  Actual: #{mu_pp act}" unless
    need_to_diff
  Tempfile.open("expect") do |a|
    a.puts expect
    a.flush
    Tempfile.open("butwas") do |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
end

def exception_details e, msg

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

def flunk msg = nil

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

def message msg = nil, ending = nil, &default

def message msg = nil, ending = nil, &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

def mu_pp obj

def mu_pp obj
  s = obj.inspect
  if defined? Encoding then
    s = s.encode Encoding.default_external
    if String === obj && (obj.encoding != Encoding.default_external ||
                          !obj.valid_encoding?) then
      enc = "# encoding: #{obj.encoding}"
      val = "#    valid: #{obj.valid_encoding?}"
      s = "#{enc}\n#{val}\n#{s}"
    end
  end
  s
end

def mu_pp_for_diff obj

def mu_pp_for_diff obj
  str = mu_pp obj
  # both '\n' & '\\n' (_after_ mu_pp (aka inspect))
  single = !!str.match(/(?<!\\|^)\\n/)
  double = !!str.match(/(?<=\\|^)\\n/)
  process =
    if single ^ double then
      if single then
        lambda { |s| s == "\\n"   ? "\n"    : s } # unescape
      else
        lambda { |s| s == "\\\\n" ? "\\n\n" : s } # unescape a bit, add nls
      end
    else
      :itself                                     # leave it alone
    end
  str.
    gsub(/\\?\\n/, &process).
    gsub(/:0x[a-fA-F0-9]{4,}/m, ":0xXXXXXX") # anonymize hex values
end

def pass _msg = nil

def pass _msg = nil
  assert true
end

def refute test, msg = nil

def refute test, msg = nil
  msg ||= message { "Expected #{mu_pp(test)} to not be truthy" }
  not assert !test, msg
end

def refute_empty obj, msg = nil

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

def refute_equal exp, act, msg = nil

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

def refute_in_delta exp, act, delta = 0.001, msg = nil

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

def refute_in_epsilon a, b, epsilon = 0.001, msg = nil

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

def refute_includes collection, obj, msg = nil

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

def refute_instance_of cls, obj, msg = nil

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

def refute_kind_of cls, obj, msg = nil

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

def refute_match matcher, obj, msg = nil

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

def refute_nil obj, msg = nil

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

def refute_operator o1, op, o2 = UNDEFINED, msg = nil

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

def refute_predicate o1, op, msg = nil

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

def refute_respond_to obj, meth, msg = nil

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

def refute_same exp, act, msg = nil

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

def skip msg = nil, bt = caller

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

def skipped?

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