Method test_post_init

Lib/test/test_dataclasses/__init__.py:5142–5166

(self)

    def test_post_init(self):
        @dataclass
        class A:
            a: int
            _: KW_ONLY
            b: InitVar[int]
            c: int
            d: InitVar[int]
            def __post_init__(self, b, d):
                raise CustomError(f'{b=} {d=}')
        with self.assertRaisesRegex(CustomError, 'b=3 d=4'):
            A(1, c=2, b=3, d=4)

        @dataclass
        class B:
            a: int
            _: KW_ONLY
            b: InitVar[int]
            c: int
            d: InitVar[int]
            def __post_init__(self, b, d):
                self.a = b
                self.c = d
        b = B(1, c=2, b=3, d=4)
        self.assertEqual(asdict(b), {'a': 3, 'c': 4})

    def test_defaults(self):
        # For kwargs, make sure we can have defaults after non-defaults.