code: def assertTraceContains(response, message):
      
      if not hasattr(response, "verify_trace"):
          raise AttributeError("Response object does not contain verify_trace method!")
      if not response.verify_trace(message, False):
          raise TestStepFail('Assert: Message(s) "%s" not in response' % message)
docs: Raise TestStepFail if response.verify_trace does not find message from response traces.
  
      :param response: Response. Must contain method verify_trace
      :param message: Message to look for
      :return: Nothing
      :raises: AttributeError if response does not contain verify_trace method.
      TestStepFail if verify_trace returns False.