def METHOD_NAME():
    env_fns = [make_env("CartPole-v1", i) for i in range(8)]
    env = SyncVectorEnv(env_fns)
    observations, infos = env.reset()
    env.close()
    assert isinstance(env.observation_space, Box)
    assert isinstance(observations, np.ndarray)
    assert isinstance(infos, dict)
    assert observations.dtype == env.observation_space.dtype
    assert observations.shape == (8,) + env.single_observation_space.shape
    assert observations.shape == env.observation_space.shape
    del observations