code: def test_raise_exception_in_get_external_persistor():
      with pytest.raises(ImportError):
          _ = persistor.get_persistor("unknown.persistor")
  
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 4 for calling a global function with example usage: test_raise_exception_in_get_external_persistor() without return types