docstr: Tests that defult components are added when necessary.
code: def test_default_components(self):
      """Tests that defult components are added when necessary."""
      self._create_metadata()
      stored_metadata = plugin_data_pb2.MeshPluginData(
          version=metadata.get_current_version(), components=0
      )
      parsed_metadata = metadata.parse_plugin_metadata(
          stored_metadata.SerializeToString()
      )
      self.assertGreater(parsed_metadata.components, 0)
  
file_path: tensorboard/tensorboard/plugins/mesh/metadata_test.py
imports: import tensorflow
  from tensorboard.plugins.mesh import metadata
  from tensorboard.plugins.mesh import plugin_data_pb2
label_desc: Use image node_id 7 for calling the MetadataTest obj's underlying member method code with example usage: obj.test_default_components() without return types