code: def test_return_bullet_env():
      env = GymEnv(env=gym.make("CartPoleBulletEnv-v1"))
      assert isinstance(env, BulletEnv)
      env = GymEnv(env="CartPoleBulletEnv-v1")
      assert isinstance(env, BulletEnv)
      env = GymEnv(gym.make("CartPoleBulletEnv-v1"))
      assert isinstance(env, BulletEnv)
      env = GymEnv("CartPoleBulletEnv-v1")
      assert isinstance(env, BulletEnv)
  
imports: import math
  import pickle
  import gym
  import pytest
  from garage import EnvSpec
  from garage.envs import GymEnv
  from garage.envs.bullet import BulletEnv
  from garage.envs.wrappers.clip_reward import ClipReward
  from garage.envs.wrappers.episodic_life import EpisodicLife
  from garage.envs.wrappers.grayscale import Grayscale
  from garage.envs.wrappers.max_and_skip import MaxAndSkip
  from garage.envs.wrappers.noop import Noop
  from garage.envs.wrappers.resize import Resize
  from garage.envs.wrappers.stack_frames import StackFrames
label_desc: Use image node_id 6 for calling a global function with example usage: test_return_bullet_env() without return types