Method test_slots_no_weakref

Lib/test/test_dataclasses/__init__.py:3673–3685

(self)

        self.assertEqual(obj.b, 'b')

    def test_slots_no_weakref(self):
        @dataclass(slots=True)
        class A:
            # No weakref.
            pass

        self.assertNotIn("__weakref__", A.__slots__)
        a = A()
        with self.assertRaisesRegex(TypeError,
                                    "cannot create weak reference"):
            weakref.ref(a)
        with self.assertRaises(AttributeError):
            a.__weakref__

    def test_slots_weakref(self):
        @dataclass(slots=True, weakref_slot=True)