'Proxy objects should proxy declared attributes, but not other
attributes.'

def test_proxyAttribute(self):

    yayable = Yayable()
    yayable.ifaceAttribute = object()
    proxy = proxyForInterface(IProxiedInterface)(yayable)
    self.assertIs(proxy.ifaceAttribute, yayable.ifaceAttribute)
    self.assertRaises(AttributeError, (lambda : proxy.yays))
