docs: def _call_spy(self, *args, **kwargs):
        '''
        Wrapper to call the spied-on function. Operates similar to
        Expectation.test.
        '''
        if self._spy_side_effect:
            if self._spy_side_effect_args or self._spy_side_effect_kwargs:
                self._spy_side_effect(
                    *self._spy_side_effect_args,
                    **self._spy_side_effect_kwargs)
            else:
                self._spy_side_effect(*args, **kwargs)
  
        return_value = self._stub.call_orig(*args, **kwargs)
        if self._spy_return:
            self._spy_return(return_value)
  
        return return_value