code: def test_invalid_env(self):
      env = GymEnv(DummyDiscreteEnv())
      with pytest.raises(ValueError):
          GaussianGRUPolicy(env_spec=env.spec)
  
file_path: garage/tests/garage/tf/policies/test_gaussian_gru_policy.py
imports: import pickle
  import numpy
  import pytest
  import tensorflow
  from garage.envs import GymEnv
  from garage.tf.policies import GaussianGRUPolicy
  from tests.fixtures import TfGraphTestCase
  from tests.fixtures.envs.dummy import DummyBoxEnv, DummyDictEnv, DummyDiscreteEnv
label_desc: Use image node_id 1 for calling the TestGaussianGRUPolicy obj's underlying member method code with example usage: obj.test_invalid_env() without return types