def test_basicErrorPropagation(self):
        """
        Verify that errors specified in a superclass are respected normally
        even if it has subclasses.
        """
        return self.errorCheck(
            InheritedError, NormalCommandProtocol, BaseCommand)

        Verify that errors specified in a superclass are respected normally
        even if it has subclasses.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_amp.py