code: def test_no_tokenizer_with_string():
      with pytest.raises(ValueError):
          TfDocumentModel("text without tokenizer")
  
file_path: sumy/tests/test_models/test_tf.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import pytest
  from sumy.models import TfDocumentModel
  from sumy.nlp.tokenizers import Tokenizer
label_desc: Use image node_id 1 for calling a global function with example usage: test_no_tokenizer_with_string() without return types