code: def test_pattern_matching_fallback(self):
      with tempfile.TemporaryDirectory() as tmp_dir:
          # This model name contains bert and roberta, but roberta ends up being picked.
          folder = os.path.join(tmp_dir, "fake-roberta")
          os.makedirs(folder, exist_ok=True)
          with open(os.path.join(folder, "config.json"), "w") as f:
              f.write(json.dumps({}))
          config = AutoConfig.from_pretrained(folder)
          self.assertEqual(type(config), RobertaConfig)
  
imports: import importlib
  import json
  import os
  import sys
  import tempfile
  import unittest
  from pathlib import Path
  import transformers.models.auto
  from transformers.models.auto.configuration_auto import CONFIG_MAPPING, AutoConfig
  from transformers.models.bert.configuration_bert import BertConfig
  from transformers.models.roberta.configuration_roberta import RobertaConfig
  from transformers.testing_utils import DUMMY_UNKNOWN_IDENTIFIER, get_tests_dir
  from test_module.custom_configuration import CustomConfig
label_desc: Use image node_id 6 for calling the AutoConfigTest obj's underlying member method code with example usage: obj.test_pattern_matching_fallback() without return types