def test_additionWithOriginalError(self):
        """
        Verify that errors specified in a command's superclass are respected
        even if that command defines new errors itself.
        """
        return self.errorCheck(
            InheritedError, AddedCommandProtocol, AddErrorsCommand, other=False)

        Verify that errors specified in a command's superclass are respected
        even if that command defines new errors itself.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_amp.py