code: def verify_response_time(self, expected_below):
          
          if self.timedelta > expected_below:
              raise ValueError("Response time is more (%f) than expected (%f)!"
                               % (self.timedelta, expected_below))
docs: Verify that response time (time span between request-response) is reasonable.
  
          :param expected_below: integer
          :return: Nothing
          :raises: ValueError if timedelta > expected time