docstr: Tests proper creation of instance name based on display_name.
code: def test_get_instance_name(self):
      """Tests proper creation of instance name based on display_name."""
      display_name = "my_mesh"
      instance_name = metadata.get_instance_name(
          display_name,
          plugin_data_pb2.MeshPluginData.ContentType.Value("VERTEX"),
      )
      self.assertEqual("%s_VERTEX" % display_name, instance_name)
  
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 2 for calling the MetadataTest obj's underlying member method code with example usage: obj.test_get_instance_name() without return types