code: def testNoCallComputeMetadata(self):
      cluster_resolver = resolver.TPUClusterResolver(
          tpu="grpc://10.1.2.3:8470"
      )
      self.assertEqual(
          "grpc://10.1.2.3:8470", cluster_resolver.master()
      )
      self.assertEqual(
          server_lib.ClusterSpec(
              {"worker": ["10.1.2.3:8470"]}
          ).as_dict(),
          cluster_resolver.cluster_spec().as_dict(),
      )
  
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 19 for calling the TPUClusterResolverTest obj's underlying member method code with example usage: obj.testNoCallComputeMetadata() without return types