test_abc.py 文件源码

def test_registration_basics(self):
        class A:
            __metaclass__ = abc.ABCMeta
        class B(object):
            pass
        b = B()
        self.assertFalse(issubclass(B, A))
        self.assertFalse(issubclass(B, (A,)))
        self.assertNotIsInstance(b, A)
        self.assertNotIsInstance(b, (A,))
        A.register(B)
        self.assertTrue(issubclass(B, A))
        self.assertTrue(issubclass(B, (A,)))
        self.assertIsInstance(b, A)
        self.assertIsInstance(b, (A,))
        class C(B):
            pass
        c = C()
        self.assertTrue(issubclass(C, A))
        self.assertTrue(issubclass(C, (A,)))
        self.assertIsInstance(c, A)
        self.assertIsInstance(c, (A,))