code: def testBuild(self):
      policy = gaussian_policy.GaussianPolicy(self._wrapped_policy)
      self.assertEqual(policy.time_step_spec, self._time_step_spec)
      self.assertEqual(policy.action_spec, self._action_spec)
      self.assertEqual(len(policy.variables()), 2)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import tensorflow
  from tf_agents.networks import network
  from tf_agents.policies import actor_policy
  from tf_agents.policies import gaussian_policy
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import time_step
  from tf_agents.utils import test_utils
label_desc: Use image node_id 4 for calling the GaussianPolicyTest obj's underlying member method code with example usage: obj.testBuild() without return types