code: def testTpuTopology(self):
      cluster_resolver = resolver.TPUClusterResolver(tpu="local")
      self.assertIsNone(cluster_resolver._tpu_topology)
  
      # Test set with tpu topology proto.
      cluster_resolver.set_tpu_topology(
          serialized_tpu_topology=topology_pb2.TopologyProto(
              mesh_shape=[1, 1, 1, 1]
          ).SerializeToString()
      )
      self.assertIsInstance(
          cluster_resolver.tpu_hardware_feature,
          topology_pb2.TPUHardwareFeature,
      )
  
imports: import os
  import six
  from six.moves.urllib.error import URLError
  from tensorflow.core.protobuf.tpu import topology_pb2
  from tensorflow.python.client import session
  from tensorflow.python.distribute.cluster_resolver.tpu import tpu_cluster_resolver
  from tensorflow.python.eager import context
  from tensorflow.python.framework import config
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.training import server_lib
  from tensorflow.python.util import compat
label_desc: Use image node_id 30 for calling the TPUClusterResolverTest obj's underlying member method code with example usage: obj.testTpuTopology() without return types