'Proxies of subinterfaces generated with proxyForInterface should allow
access to attributes of both the child and the base interfaces.'

def test_interfaceInheritance(self):

    proxyClass = proxyForInterface(IProxiedSubInterface)
    booable = Booable()
    proxy = proxyClass(booable)
    proxy.yay()
    proxy.boo()
    self.assertTrue(booable.yayed)
    self.assertTrue(booable.booed)
