Method test_field_default

Lib/test/test_dataclasses/__init__.py:540–555

(self)

            C()

    def test_field_default(self):
        default = object()
        @dataclass
        class C:
            x: object = field(default=default)

        self.assertIs(C.x, default)
        c = C(10)
        self.assertEqual(c.x, 10)

        # If we delete the instance attribute, we should then see the
        #  class attribute.
        del c.x
        self.assertIs(c.x, default)

        self.assertIs(C().x, default)

    def test_not_in_repr(self):
        @dataclass