code: def assertEqual(first, second, message=None):
      
      if not first == second:
          raise TestStepFail(
              format_message(message) if message is not None else "Assert: %s != %s" % (str(first),
                                                                                        str(second)))
docs: Assert that first equals second.
  
      :param first: First part to evaluate
      :param second: Second part to evaluate
      :param message: Failure message
      :raises: TestStepFail if not first == second