code: def testGetMasterNoEntries(self):
      tpu_map = {}
  
      with self.assertRaises(ValueError):
          resolver.TPUClusterResolver(
              project="test-project",
              zone="us-central1-c",
              tpu=[],
              coordinator_name=None,
              credentials=None,
              service=self.mock_service_client(tpu_map=tpu_map),
          )
  
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 13 for calling the TPUClusterResolverTest obj's underlying member method code with example usage: obj.testGetMasterNoEntries() without return types