code: def testLocalTpuResolver(self):
      cr = resolver.TPUClusterResolver(tpu="local")
      self.assertEqual(cr.get_master(), "")
  
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 29 for calling the TPUClusterResolverTest obj's underlying member method code with example usage: obj.testLocalTpuResolver() without return types