Method test_is_dataclass

Lib/test/test_dataclasses/__init__.py:1507–1532

(self)

                x: ClassVar[int] = field(default_factory=int)

    def test_is_dataclass(self):
        class NotDataClass:
            pass

        self.assertFalse(is_dataclass(0))
        self.assertFalse(is_dataclass(int))
        self.assertFalse(is_dataclass(NotDataClass))
        self.assertFalse(is_dataclass(NotDataClass()))

        @dataclass
        class C:
            x: int

        @dataclass
        class D:
            d: C
            e: int

        c = C(10)
        d = D(c, 4)

        self.assertTrue(is_dataclass(C))
        self.assertTrue(is_dataclass(c))
        self.assertFalse(is_dataclass(c.x))
        self.assertTrue(is_dataclass(d.d))
        self.assertFalse(is_dataclass(d.e))

    def test_is_dataclass_when_getattr_always_returns(self):
        # See bpo-37868.