def METHOD_NAME():
    env_fns = [
        make_env("CartPole-v1", i, render_mode="rgb_array_list") for i in range(4)
    ]
    env = SyncVectorEnv(env_fns)
    _ = env.reset()
    images = env.call("render")
    gravity = env.call("gravity")
    env.close()
    assert isinstance(images, tuple)
    assert len(images) == 4
    for i in range(4):
        assert len(images[i]) == 1
        assert isinstance(images[i][0], np.ndarray)
    assert isinstance(gravity, tuple)
    assert len(gravity) == 4
    for i in range(4):
        assert isinstance(gravity[i], float)
        assert gravity[i] == 9.8