code: def _retrieve_tar(self, filename: Text) -> Text:
      pass
  
file_path: rasa/tests/nlu/test_persistor.py
imports: from typing import Text
  import pytest
  from unittest.mock import patch
  from moto import mock_s3
  from rasa.nlu import persistor
  from rasa.nlu.persistor import Persistor
label_desc: Use image node_id 1 for calling the TestPersistor obj's underlying member method code with example usage: obj._retrieve_tar(filename) without return types