code: def _step_failure(self, action):
      return "error"
  
file_path: gym/tests/wrappers/test_passive_env_checker.py
imports: import re
  import warnings
  import numpy
  import pytest
  import gym
  from gym.wrappers.env_checker import PassiveEnvChecker
  from tests.envs.test_envs import PASSIVE_CHECK_IGNORE_WARNING
  from tests.envs.utils import all_testing_initialised_envs
  from tests.testing_env import GenericTestEnv
label_desc: Use image node_id 4 for calling a global function with example usage: _step_failure(action) and returns: str