def test_original(self):
        """
        Proxy objects should have an C{original} attribute which refers to the
        original object passed to the constructor.
        """
        original = object()
        proxy = proxyForInterface(IProxiedInterface)(original)
        self.assertIs(proxy.original, original)

        Proxy objects should have an C{original} attribute which refers to the
        original object passed to the constructor.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/test/test_components.py