def METHOD_NAME(self):
    no_backend = find_backend('    _import_structure["models.albert"].append("AlbertTokenizerFast")')
    self.assertIsNone(no_backend)
    simple_backend = find_backend("    if not is_tokenizers_available():")
    self.assertEqual(simple_backend, "tokenizers")
    backend_with_underscore = find_backend("    if not is_tensorflow_text_available():")
    self.assertEqual(backend_with_underscore, "tensorflow_text")
    double_backend = find_backend("    if not (is_sentencepiece_available() and is_tokenizers_available()):")
    self.assertEqual(double_backend, "sentencepiece_and_tokenizers")
    double_backend_with_underscore = find_backend(
        "    if not (is_sentencepiece_available() and is_tensorflow_text_available()):"
    )
    self.assertEqual(double_backend_with_underscore, "sentencepiece_and_tensorflow_text")
    triple_backend = find_backend(
        "    if not (is_sentencepiece_available() and is_tokenizers_available() and is_vision_available()):"
    )
    self.assertEqual(triple_backend, "sentencepiece_and_tokenizers_and_vision")