code: def testCustomJobNameAndPortRetrieval(self):
      gce_cluster_resolver = GCEClusterResolver(
          project="test-project",
          zone="us-east1-d",
          instance_group="test-instance-group",
          task_type="custom",
          port=2222,
          credentials=None,
          service=self.standard_mock_service_client(),
      )
  
      actual_cluster_spec = gce_cluster_resolver.cluster_spec()
      expected_proto = """
      job { name: 'custom' tasks { key: 0 value: '10.123.45.67:2222' } }
      """
      self._verifyClusterSpecEquality(
          actual_cluster_spec, expected_proto
      )
  
imports: from tensorflow.python.distribute.cluster_resolver.cluster_resolver import UnionClusterResolver
  from tensorflow.python.distribute.cluster_resolver.gce_cluster_resolver import GCEClusterResolver
  from tensorflow.python.platform import test
  from tensorflow.python.training import server_lib
label_desc: Use image node_id 11 for calling the GCEClusterResolverTest obj's underlying member method code with example usage: obj.testCustomJobNameAndPortRetrieval() without return types