Method test_post_init_classmethod

Lib/test/test_dataclasses/__init__.py:1098–1111

(self)

        self.assertTrue(flag)

    def test_post_init_classmethod(self):
        @dataclass
        class C:
            flag = False
            x: int
            y: int
            @classmethod
            def __post_init__(cls):
                cls.flag = True

        self.assertFalse(C.flag)
        c = C(3, 4)
        self.assertEqual((c.x, c.y), (3, 4))
        self.assertTrue(C.flag)

    def test_post_init_not_auto_added(self):
        # See bpo-46757, which had proposed always adding __post_init__.  As