def devaluate(actual, expected)
      if expected != actual
        pass new_message.is_equal_to(expected).when_it_is(actual)
      else
        fail new_message.did_not_expect(actual)
      end
    end
def devaluate(actual, expected)
      if expected != actual
        pass new_message.is_equal_to(expected).when_it_is(actual)
      else
        fail new_message.did_not_expect(actual)
      end
    end
(see Riot::AssertionMacro#devaluate)
 @param [Object] expected the object value to compare actual to