Module: Megatest::Assertions

Included in:
Test
Defined in:
lib/megatest/assertions.rb

Instance Method Summary collapse

Instance Method Details

#assert(result, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 45

def assert(result, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    return if result

    if message
      @__m.fail(message)
    else
      @__m.fail(message, "Expected", @__m.pp(result), "to be truthy")
    end
  end
end

#assert_changes(expression, msg = nil, message: nil, from: @__m.unset, to: @__m.unset, &block) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 458

def assert_changes(expression, msg = nil, message: nil, from: @__m.unset, to: @__m.unset, &block)
  message = @__m.msg(msg, message)
  exp = @__m.expression(expression, block)
  @__m.assert do
    before = exp.call
    if @__m.set?(from) && !(from === before)
      @__m.fail(message, "Expected `#{@__m.pp_expression(exp)}` to starts from #{@__m.pp(from)}, but was #{@__m.pp(before)}")
    end

    retval = assert_nothing_raised(&block)

    after = exp.call

    if before == after
      details = "Expected `#{@__m.pp_expression(exp)}` to change"
      if @__m.set?(to)
        details = "#{details} to #{@__m.pp(to)}"
      end

      if before == to
        details = "#{details}, but it was already #{@__m.pp(to)}."
      else
        details = "#{details}, but it stayed #{@__m.pp(before)}"
      end

      @__m.fail(message, details)
    end

    if @__m.set?(to) && !(to === after)
      @__m.fail(message, "Expected `#{@__m.pp_expression(exp)}` to change to #{@__m.pp(to)}, got #{@__m.pp(after)}")
    end

    retval
  end
end

#assert_difference(expression, difference = @__m.unset, message: nil, &block) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 408

def assert_difference(expression, difference = @__m.unset, message: nil, &block)
  expressions = if @__m.set?(difference)
    Array(expression).to_h { |e| [e, difference] }
  elsif Hash === expression
    expression
  else
    Array(expression).to_h { |e| [e, 1] }
  end

  exps = expressions.keys.map { |e| @__m.expression(e, block) }

  @__m.assert do
    before = exps.map(&:call)

    retval = @__m.safe_yield(&block)

    expressions.zip(exps, before) do |(code, diff), exp, before_value|
      actual = exp.call
      expected = before_value + diff
      unless expected == actual
        error = "`#{@__m.pp_expression(code)}` didn't change by #{diff}, but by #{actual - before_value}."
        @__m.fail(message, error)
      end
    end

    retval
  end
end

#assert_empty(object, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 142

def assert_empty(object, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    unless object.empty?
      @__m.fail message, "Expected", @__m.pp(object), "to be empty"
    end
  end
end

#assert_equal(expected, actual, msg = nil, message: nil, allow_nil: false) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 91

def assert_equal(expected, actual, msg = nil, message: nil, allow_nil: false)
  message = @__m.msg(msg, message)
  @__m.assert do
    if !allow_nil && nil == expected
      @__m.fail(nil, "Use assert_nil if expecting nil, or pass `allow_nil: true`")
    end

    if expected != actual
      @__m.fail(
        message,
        @__m.diff(expected, actual) ||
        "Expected: #{@__m.pp(expected)}\n" \
        "  Actual: #{@__m.pp(actual)}",
      )
    end
  end
end

#assert_in_delta(expected, actual, delta = 0.001, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 515

def assert_in_delta(expected, actual, delta = 0.001, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    diff = (expected - actual).abs
    unless delta >= diff
      @__m.fail(message, "Expected", "|#{@__m.pp(expected)} - #{@__m.pp(actual)}| (#{diff})", "to be <= #{delta}")
    end
  end
end

#assert_in_epsilon(expected, actual, epsilon = 0.001, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 536

def assert_in_epsilon(expected, actual, epsilon = 0.001, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    diff = (expected - actual).abs
    delta = [expected.abs, actual.abs].min * epsilon
    unless delta >= diff
      @__m.fail(message, "Expected", "|#{@__m.pp(expected)} - #{@__m.pp(actual)}| (#{diff})", "to be <= #{delta}")
    end
  end
end

#assert_includes(collection, object, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 123

def assert_includes(collection, object, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    unless collection.include?(object)
      @__m.fail message, "Expected", @__m.pp(collection), "to include", @__m.pp(object)
    end
  end
end

#assert_instance_of(klass, actual, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 161

def assert_instance_of(klass, actual, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    unless actual.instance_of?(klass)
      @__m.fail(message, "Expected", @__m.pp(actual), "to be an instance of", @__m.pp(klass), "not", @__m.pp(actual.class))
    end
  end
end

#assert_kind_of(klass, actual, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 180

def assert_kind_of(klass, actual, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    unless actual.kind_of?(klass)
      @__m.fail(message, "Expected", @__m.pp(actual), "to be a kind of", @__m.pp(klass), "not", @__m.pp(actual.class))
    end
  end
end

#assert_match(original_matcher, obj, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 218

def assert_match(original_matcher, obj, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    matcher = if ::String === original_matcher
      ::Regexp.new(::Regexp.escape(original_matcher))
    else
      original_matcher
    end

    unless match = matcher.match(obj)
      @__m.fail(message, "Expected", @__m.pp(original_matcher), "to match", @__m.pp(obj))
    end

    match
  end
end

#assert_nil(actual, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 72

def assert_nil(actual, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    unless nil.equal?(actual)
      @__m.fail(message, "Expected", @__m.pp(actual), "to be nil")
    end
  end
end

#assert_nothing_raised ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 358

def assert_nothing_raised
  @__m.assert do
    yield
  rescue ::Megatest::Assertion, *::Megatest::IGNORED_ERRORS
    raise # Pass through
  rescue Exception => unexepected_exception
    raise ::Megatest::UnexpectedError, unexepected_exception
  end
end

#assert_operator(left, operator, right, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 389

def assert_operator(left, operator, right, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    unless left.__send__(operator, right)
      @__m.fail(message, "Expected", @__m.pp(left), "to be #{operator}", @__m.pp(right))
    end
  end
end

#assert_output(expected_stdout = nil, expected_stderr = nil, &block) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 571

def assert_output(expected_stdout = nil, expected_stderr = nil, &block)
  @__m.assert do
    @__m.fail("assert_output requires a block to capture output.") unless block_given?

    actual_stdout, actual_stderr = @__m.expect_no_failures do
      capture_io(&block)
    end

    if expected_stderr
      if Regexp === expected_stderr
        assert_match(expected_stderr, actual_stderr, message: "In stderr")
      else
        assert_equal(expected_stderr, actual_stderr, message: "In stderr")
      end
    end

    if expected_stdout
      if Regexp === expected_stdout
        assert_match(expected_stdout, actual_stdout, message: "In stdout")
      else
        assert_equal(expected_stdout, actual_stdout, message: "In stdout")
      end
    end
  end
end

#assert_predicate(actual, predicate, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 199

def assert_predicate(actual, predicate, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    unless @__m.expect_no_failures { actual.__send__(predicate) }
      @__m.fail(message, "Expected", @__m.pp(actual), "to be #{predicate}")
    end
  end
end

#assert_raises(expected = StandardError, *expected_exceptions, match: nil, message: nil) ⇒ Object Also known as: assert_raise 



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# File 'lib/megatest/assertions.rb', line 309

def assert_raises(expected = StandardError, *expected_exceptions, match: nil, message: nil)
  msg = expected_exceptions.pop if expected_exceptions.last.is_a?(String)
  message = @__m.msg(msg, message)

  matcher = if match
    if ::String === match
      ::Regexp.new(::Regexp.escape(match))
    else
      match
    end
  end

  @__m.assert do
    @__m.fail("assert_raises requires a block to capture errors.") unless block_given?

    begin
      before_yield = __LINE__
      yield
    rescue expected, *expected_exceptions => exception
      if matcher && !matcher.match?(exception.message)
        @__m.fail(message, "Expected", @__m.pp(match), "to match", @__m.pp(exception.message))
      end

      return exception
    rescue ::Megatest::Assertion, *::Megatest::IGNORED_ERRORS
      raise # Pass through
    rescue ::Exception => unexepected_exception
      error = @__m.strip_backtrace(unexepected_exception, __FILE__, before_yield + 1, 0)

      expected_pp = if expected_exceptions.empty?
        @__m.pp(expected)
      else
        expected_exceptions.map { |e| @__m.pp(e) }.join(", ") << " or #{@__m.pp(expected)}"
      end

      @__m.fail(message, "#{expected_pp} exception expected, not:\n#{@__m.pp(error)}")
    else
      expected_pp = if expected_exceptions.empty?
        @__m.pp(expected)
      else
        expected_exceptions.map { |e| @__m.pp(e) }.join(", ") << " or #{@__m.pp(expected)}"
      end

      @__m.fail(message, "Expected", expected_pp, "but nothing was raised.")
    end
  end
end

#assert_respond_to(object, method, msg = nil, message: nil, include_all: false) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 251

def assert_respond_to(object, method, msg = nil, message: nil, include_all: false)
  message = @__m.msg(msg, message)
  @__m.assert do
    unless object.respond_to?(method, include_all)
      @__m.fail(message, "Expected", @__m.pp(object), "to respond to :#{method}")
    end
  end
end

#assert_same(expected, actual, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 270

def assert_same(expected, actual, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    unless expected.equal?(actual)
      @__m.fail message, begin
        actual_pp = @__m.pp(actual)
        expected_pp = @__m.pp(expected)
        if actual_pp == expected_pp
          actual_pp += " (id: #{actual.object_id})"
          expected_pp += " (id: #{expected.object_id})"
        end

        "Expected          #{actual_pp}\n" \
        "To be the same as #{expected_pp}"
      end
    end
  end
end

#assert_silent(&block) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 597

def assert_silent(&block)
  @__m.assert do
    assert_output("", "", &block)
  end
end

#assert_throws(thrown_object, msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 368

def assert_throws(thrown_object, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    caught = true
    value = catch(thrown_object) do
      @__m.expect_no_failures do
        yield
      rescue UncaughtThrowError => error
        @__m.fail(message, "Expected", @__m.pp(thrown_object), "to have been thrown, not:", @__m.pp(error.tag))
      end
      caught = false
    end

    unless caught
      @__m.fail(message, "Expected", @__m.pp(thrown_object), "to have been thrown, but it wasn't")
    end

    value
  end
end

#capture_io ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 603

def capture_io
  require "stringio" unless defined?(::StringIO)
  captured_stdout, captured_stderr = ::StringIO.new, ::StringIO.new

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

  begin
    yield

    [captured_stdout.string, captured_stderr.string]
  ensure
    $stdout = orig_stdout
    $stderr = orig_stderr
  end
end

#flunk(msg = nil, message: nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 564

def flunk(msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    @__m.fail(message || "Failed")
  end
end

#pass ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 41

def pass
  @__m.assert {}
end

#refute(result, msg = nil, message: nil) ⇒ Object Also known as: assert_not 



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# File 'lib/megatest/assertions.rb', line 58

def refute(result, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    return unless result

    if message
      @__m.fail(message)
    else
      @__m.fail(message, "Expected", @__m.pp(result), "to be falsy")
    end
  end
end

#refute_changes(expression, msg = nil, message: nil, from: @__m.unset, &block) ⇒ Object Also known as: assert_no_changes 



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# File 'lib/megatest/assertions.rb', line 494

def refute_changes(expression, msg = nil, message: nil, from: @__m.unset, &block)
  message = @__m.msg(msg, message)
  exp = @__m.expression(expression, block)
  @__m.assert do
    before = exp.call
    if @__m.set?(from) && !(from === before)
      @__m.fail(message, "Expected `#{@__m.pp_expression(exp)}` to start from #{@__m.pp(from)}, but was #{@__m.pp(before)}.")
    end

    retval = assert_nothing_raised(&block)

    after = exp.call
    unless before == after
      @__m.fail(message, "Expected `#{@__m.pp_expression(exp)}` to not change, but it changed from #{@__m.pp(before)} to #{@__m.pp(after)}.")
    end

    retval
  end
end

#refute_difference(expressions, message: nil, &block) ⇒ Object Also known as: assert_no_difference 



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# File 'lib/megatest/assertions.rb', line 437

def refute_difference(expressions, message: nil, &block)
  exps = Array(expressions).map { |e| @__m.expression(e, block) }

  @__m.assert do
    before = exps.map(&:call)

    retval = @__m.safe_yield(&block)

    exps.zip(before) do |exp, before_value|
      actual = exp.call
      unless before_value == actual
        error = "Expected `#{@__m.pp_expression(exp)}` to not change, but it changed from #{@__m.pp(before_value)} to #{@__m.pp(actual)}."
        @__m.fail(message, error)
      end
    end

    retval
  end
end

#refute_empty(object, msg = nil, message: nil) ⇒ Object Also known as: assert_not_empty 



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# File 'lib/megatest/assertions.rb', line 151

def refute_empty(object, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    if object.empty?
      @__m.fail message, "Expected", @__m.pp(object), "to not be empty"
    end
  end
end

#refute_equal(expected, actual, msg = nil, message: nil, allow_nil: false) ⇒ Object Also known as: assert_not_equal 



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# File 'lib/megatest/assertions.rb', line 109

def refute_equal(expected, actual, msg = nil, message: nil, allow_nil: false)
  message = @__m.msg(msg, message)
  @__m.assert do
    if !allow_nil && nil == expected && !@__m.minitest_compatibility?
      @__m.fail(nil, "Use refute_nil if expecting to not be nil, or pass `allow_nil: true`")
    end

    if expected == actual
      @__m.fail(message, "Expected", @__m.pp(expected), "to not equal", @__m.pp(actual))
    end
  end
end

#refute_in_delta(expected, actual, delta = 0.001, msg = nil, message: nil) ⇒ Object Also known as: assert_not_in_delta 



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# File 'lib/megatest/assertions.rb', line 525

def refute_in_delta(expected, actual, delta = 0.001, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    diff = (expected - actual).abs
    if delta >= diff
      @__m.fail(message, "Expected", "|#{@__m.pp(expected)} - #{@__m.pp(actual)}| (#{diff})", "to not be <= #{delta}")
    end
  end
end

#refute_in_epsilon(expected, actual, epsilon = 0.001, msg = nil, message: nil) ⇒ Object Also known as: assert_not_epsilon 



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# File 'lib/megatest/assertions.rb', line 547

def refute_in_epsilon(expected, actual, epsilon = 0.001, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    diff = (expected - actual).abs
    delta = [expected.abs, actual.abs].min * epsilon
    if delta >= diff
      @__m.fail(message, "Expected", "|#{@__m.pp(expected)} - #{@__m.pp(actual)}| (#{diff})", "to not be <= #{delta}")
    end
  end
end

#refute_includes(collection, object, msg = nil, message: nil) ⇒ Object Also known as: assert_not_includes 



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# File 'lib/megatest/assertions.rb', line 132

def refute_includes(collection, object, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    if collection.include?(object)
      @__m.fail message, "Expected", @__m.pp(collection), "to not include", @__m.pp(object)
    end
  end
end

#refute_instance_of(klass, actual, msg = nil, message: nil) ⇒ Object Also known as: assert_not_instance_of 



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# File 'lib/megatest/assertions.rb', line 170

def refute_instance_of(klass, actual, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    if actual.instance_of?(klass)
      @__m.fail(message, "Expected", @__m.pp(actual), "to not be an instance of", @__m.pp(klass))
    end
  end
end

#refute_kind_of(klass, actual, msg = nil, message: nil) ⇒ Object Also known as: assert_not_kind_of 



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# File 'lib/megatest/assertions.rb', line 189

def refute_kind_of(klass, actual, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    if actual.kind_of?(klass)
      @__m.fail(message, "Expected", @__m.pp(actual), "to not be a kind of", @__m.pp(klass))
    end
  end
end

#refute_match(original_matcher, obj, msg = nil, message: nil) ⇒ Object Also known as: assert_no_match 



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# File 'lib/megatest/assertions.rb', line 235

def refute_match(original_matcher, obj, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    matcher = if ::String === original_matcher
      ::Regexp.new(::Regexp.escape(original_matcher))
    else
      original_matcher
    end

    if matcher.match?(obj)
      @__m.fail(message, "Expected", @__m.pp(original_matcher), "to not match", @__m.pp(obj))
    end
  end
end

#refute_nil(actual, msg = nil, message: nil) ⇒ Object Also known as: assert_not_nil 



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# File 'lib/megatest/assertions.rb', line 81

def refute_nil(actual, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    if nil.equal?(actual)
      @__m.fail(message, "Expected", @__m.pp(actual), "to not be nil")
    end
  end
end

#refute_operator(left, operator, right, msg = nil, message: nil) ⇒ Object Also known as: assert_not_operator 



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# File 'lib/megatest/assertions.rb', line 398

def refute_operator(left, operator, right, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    if left.__send__(operator, right)
      @__m.fail(message, "Expected", @__m.pp(left), "to not be #{operator}", @__m.pp(right))
    end
  end
end

#refute_predicate(actual, predicate, msg = nil, message: nil) ⇒ Object Also known as: assert_not_predicate 



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# File 'lib/megatest/assertions.rb', line 208

def refute_predicate(actual, predicate, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    if @__m.expect_no_failures { actual.__send__(predicate) }
      @__m.fail(message, "Expected", @__m.pp(actual), "to not be #{predicate}")
    end
  end
end

#refute_respond_to(object, method, msg = nil, message: nil, include_all: false) ⇒ Object Also known as: assert_not_respond_to 



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# File 'lib/megatest/assertions.rb', line 260

def refute_respond_to(object, method, msg = nil, message: nil, include_all: false)
  message = @__m.msg(msg, message)
  @__m.assert do
    if object.respond_to?(method, include_all)
      @__m.fail(message, "Expected", @__m.pp(object), "to not respond to :#{method}")
    end
  end
end

#refute_same(expected, actual, msg = nil, message: nil) ⇒ Object Also known as: assert_not_same 



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# File 'lib/megatest/assertions.rb', line 289

def refute_same(expected, actual, msg = nil, message: nil)
  message = @__m.msg(msg, message)
  @__m.assert do
    if expected.equal?(actual)
      @__m.fail message, begin
        actual_pp = @__m.pp(actual)
        expected_pp = @__m.pp(expected)
        if actual_pp == expected_pp
          actual_pp += " (id: #{actual.object_id})"
          expected_pp += " (id: #{expected.object_id})"
        end

        "Expected              #{actual_pp}\n" \
        "To not be the same as #{expected_pp}"
      end
    end
  end
end

#skip(message = nil) ⇒ Object 



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# File 'lib/megatest/assertions.rb', line 559

def skip(message = nil)
  message ||= "Skipped, no message given"
  ::Kernel.raise(::Megatest::Skip, message, nil)
end