class_docstr: Tests for ValueArtifact.
code: def setUp(self):
      super().setUp()
      self.addCleanup(mock.patch.stopall)
  
imports: import json
  from unittest import mock
  import tensorflow
  from tfx.dsl.io import fileio
  from tfx.types import standard_artifacts
  from tfx.types import system_artifacts
  from tfx.types import value_artifact
  from google.protobuf import json_format
  from ml_metadata.proto import metadata_store_pb2
label_desc: Use image node_id 1 for calling the ValueArtifactTest obj's underlying member method code with example usage: obj.setUp() without return types