code: def test_roundtrip(self):
      result = grpc_util.extract_version(grpc_util.version_metadata())
      self.assertEqual(result, version.VERSION)
  
imports: import contextlib
  import hashlib
  import threading
  import time
  from concurrent import futures
  import grpc
  from tensorboard.util import grpc_util
  from tensorboard.util import grpc_util_test_pb2
  from tensorboard.util import grpc_util_test_pb2_grpc
  from tensorboard.util import test_util
  from tensorboard import test
  from tensorboard import version
label_desc: Use image node_id 2 for calling the VersionMetadataTest obj's underlying member method code with example usage: obj.test_roundtrip() without return types