Method test_slots_special2

Lib/test/test_descr.py:1447–1485

(self)

                __slots__ = ['__dict__', 'x']

    def test_slots_special2(self):
        # Testing __qualname__ and __classcell__ in __slots__
        class Meta(type):
            def __new__(cls, name, bases, namespace, attr):
                self.assertIn(attr, namespace)
                return super().__new__(cls, name, bases, namespace)

        class C1:
            def __init__(self):
                self.b = 42
        class C2(C1, metaclass=Meta, attr="__classcell__"):
            __slots__ = ["__classcell__"]
            def __init__(self):
                super().__init__()
        self.assertIsInstance(C2.__dict__["__classcell__"],
                              types.MemberDescriptorType)
        c = C2()
        self.assertEqual(c.b, 42)
        self.assertNotHasAttr(c, "__classcell__")
        c.__classcell__ = 42
        self.assertEqual(c.__classcell__, 42)
        with self.assertRaises(TypeError):
            class C3:
                __classcell__ = 42
                __slots__ = ["__classcell__"]

        class Q1(metaclass=Meta, attr="__qualname__"):
            __slots__ = ["__qualname__"]
        self.assertEqual(Q1.__qualname__, C1.__qualname__[:-2] + "Q1")
        self.assertIsInstance(Q1.__dict__["__qualname__"],
                              types.MemberDescriptorType)
        q = Q1()
        self.assertNotHasAttr(q, "__qualname__")
        q.__qualname__ = "q"
        self.assertEqual(q.__qualname__, "q")
        with self.assertRaises(TypeError):
            class Q2:
                __qualname__ = object()
                __slots__ = ["__qualname__"]

    def test_slots_descriptor(self):
        # Issue2115: slot descriptors did not correctly check