code: def test_pickle_unpickle(self):
      test_env = base.EnvironmentWrapper(
          environment=fakes.DiscreteEnvironment()
      )
  
      test_env_pickled = pickle.dumps(test_env)
      test_env_restored = pickle.loads(test_env_pickled)
      self.assertEqual(
          test_env.observation_spec(),
          test_env_restored.observation_spec(),
      )
  
file_path: acme/acme/wrappers/base_test.py
imports: import copy
  import pickle
  from acme.testing import fakes
  from acme.wrappers import base
  from absl.testing import absltest
label_desc: Use image node_id 1 for calling the BaseTest obj's underlying member method code with example usage: obj.test_pickle_unpickle() without return types