code: def test_from_pretrained_subfolder(self):
      with self.assertRaises(OSError):
          # config is in subfolder, the following should not work without specifying the subfolder
          _ = BertConfig.from_pretrained(
              "hf-internal-testing/tiny-random-bert-subfolder"
          )
  
      config = BertConfig.from_pretrained(
          "hf-internal-testing/tiny-random-bert-subfolder",
          subfolder="bert",
      )
  
      self.assertIsNotNone(config)
  
imports: import copy
  import json
  import os
  import shutil
  import sys
  import tempfile
  import unittest
  import unittest.mock
  from pathlib import Path
  from huggingface_hub import HfFolder, delete_repo, set_access_token
  from requests.exceptions import HTTPError
  from transformers import AutoConfig, BertConfig, GPT2Config, is_torch_available
  from transformers.configuration_utils import PretrainedConfig
  from transformers.testing_utils import TOKEN, USER, is_staging_test
  from test_module.custom_configuration import CustomConfig
label_desc: Use image node_id 3 for calling the ConfigTestUtils obj's underlying member method code with example usage: obj.test_from_pretrained_subfolder() without return types