code: def testSave(self):
      saver = mock.create_autospec(
          policy_saver.PolicySaver, instance=True
      )
      async_saver = async_policy_saver.AsyncPolicySaver(saver)
  
      self.evaluate(tf.compat.v1.global_variables_initializer())
      save_path = os.path.join(self.get_temp_dir(), "policy")
      async_saver.save(save_path)
      async_saver.flush()
  
      saver.save.assert_called_once_with(save_path)
      # Have to close the saver to avoid hanging threads that will prevent OSS
      # tests from finishing.
      async_saver.close()
  
file_path: agents/tf_agents/policies/async_policy_saver_test.py
imports: import os
  from absl.testing.absltest import mock
  import tensorflow
  from tf_agents.networks import q_network
  from tf_agents.policies import async_policy_saver
  from tf_agents.policies import policy_saver
  from tf_agents.policies import q_policy
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import time_step
  from tf_agents.utils import common
  from tf_agents.utils import test_utils
label_desc: Use image node_id 1 for calling the AsyncPolicySaverTest obj's underlying member method code with example usage: obj.testSave() without return types