code: def test_access_valid_setting():
      SETTINGS = copy.deepcopy(DEFAULT_SETTINGS)
      SETTINGS.CONFIG.READ_ONLY_CONFIG = True
      assert SETTINGS.CONFIG.READ_ONLY_CONFIG
  
imports: import copy
  from sacred import SETTINGS
  import pytest
  from sacred.settings import SettingError
label_desc: Use image node_id 3 for calling a global function with example usage: test_access_valid_setting() without return types