code: def test_tpu_strategy(
      self,
      mock_tpu_cluster_resolver,
      mock_experimental_connect_to_cluster,
      mock_initialize_tpu_system,
      mock_tpu_strategy,
  ):
      resolver = mock.MagicMock()
      mock_tpu_cluster_resolver.return_value = resolver
      mock_strategy = mock.MagicMock()
      mock_tpu_strategy.return_value = mock_strategy
  
      strategy = strategy_utils.get_strategy(
          tpu="bns_address", use_gpu=False
      )
  
      mock_tpu_cluster_resolver.assert_called_with(tpu="bns_address")
      mock_experimental_connect_to_cluster.assert_called_with(resolver)
      mock_initialize_tpu_system.assert_called_with(resolver)
      self.assertIs(strategy, mock_strategy)
  
file_path: agents/tf_agents/train/utils/strategy_utils_test.py
imports: from absl.testing.absltest import mock
  import tensorflow.compat.v2
  from tf_agents.train.utils import strategy_utils
  from tf_agents.utils import test_utils
label_desc: Use image node_id 2 for calling the StrategyUtilsTest obj's underlying member method code with example usage: obj.test_tpu_strategy(mock_tpu_cluster_resolver, mock_experimental_connect_to_cluster, mock_initialize_tpu_system, mock_tpu_strategy) without return types