code: def clear(cls):
      
      # Clear the in-memory settings cache, forcing reload upon subsequent "get"
      # request.
      super(Configuration, cls).clear()
  
      # Reset in-memory custom configuration info.
      _CustomConfigurationFileWrapper.clear(persistent=False)
docs: Clear all configuration properties from in-memory cache, but do NOT
      alter the custom configuration file. Used in unit-testing.