code: def test_load_config_missing_append_config_raise_exception():
      with pytest.raises(exceptions.ExecutionError):
          config.load_config(
              None, ["dont_exist_config.cfg"], isolated=False
          )
  
imports: from __future__ import annotations
  import configparser
  import os.path
  from unittest import mock
  import pytest
  from flake8 import exceptions
  from flake8.main.options import register_default_options
  from flake8.options import config
  from flake8.options.manager import OptionManager
label_desc: Use image node_id 23 for calling a global function with example usage: test_load_config_missing_append_config_raise_exception() without return types