test_weakref.py 文件源码

def test_getweakrefs(self):
        o = C()
        ref1 = weakref.ref(o, self.callback)
        ref2 = weakref.ref(o, self.callback)
        del ref1
        self.assertEqual(weakref.getweakrefs(o), [ref2],
                     "list of refs does not match")

        o = C()
        ref1 = weakref.ref(o, self.callback)
        ref2 = weakref.ref(o, self.callback)
        del ref2
        self.assertEqual(weakref.getweakrefs(o), [ref1],
                     "list of refs does not match")

        del ref1
        self.assertEqual(weakref.getweakrefs(o), [],
                     "list of refs not cleared")

        # assumes ints do not support weakrefs
        self.assertEqual(weakref.getweakrefs(1), [],
                     "list of refs does not match for int")