code: def create_and_test_config_from_and_save_pretrained_subfolder(self):
      config_first = self.config_class(**self.inputs_dict)
  
      subfolder = "test"
      with tempfile.TemporaryDirectory() as tmpdirname:
          sub_tmpdirname = os.path.join(tmpdirname, subfolder)
          config_first.save_pretrained(sub_tmpdirname)
          config_second = self.config_class.from_pretrained(
              tmpdirname, subfolder=subfolder
          )
  
      self.parent.assertEqual(
          config_second.to_dict(), config_first.to_dict()
      )
  
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 6 for calling the ConfigTester obj's underlying member method code with example usage: obj.create_and_test_config_from_and_save_pretrained_subfolder() without return types