code: def test_custom_envs(env_class):
      env = env_class()
      check_env(env)
  
file_path: stable-baselines/tests/test_envs.py
imports: import pytest
  import gym
  from gym import spaces
  import numpy
  from stable_baselines.common.env_checker import check_env
  from stable_baselines.common.bit_flipping_env import BitFlippingEnv
  from stable_baselines.common.identity_env import IdentityEnv, IdentityEnvBox, IdentityEnvMultiBinary, IdentityEnvMultiDiscrete
label_desc: Use image node_id 2 for calling a global function with example usage: test_custom_envs(env_class) without return types