code: def _verify_method(self):
          
  
          class_level = self._target.is_class_or_module()
  
          verify_method(self._target, self._method_name, class_level=class_level)
docs: Verify that a method may be doubled.
  
          Verifies that the target object has a method matching the name the user is attempting to
          double.
  
          :raise: ``VerifyingDoubleError`` if no matching method is found.