code: def test_pickleable(self):
      env = GridWorldEnv(desc="8x8")
      round_trip = pickle.loads(pickle.dumps(env))
      assert round_trip
      assert round_trip._start_state == env._start_state
      step_env(round_trip)
      round_trip.close()
      env.close()
  
imports: import pickle
  from garage.envs.grid_world_env import GridWorldEnv
  from tests.helpers import step_env
label_desc: Use image node_id 1 for calling the TestGridWorldEnv obj's underlying member method code with example usage: obj.test_pickleable() without return types