Method test_missing_default

Lib/test/test_dataclasses/__init__.py:944–963

(self)

        )

    def test_missing_default(self):
        # Test that MISSING works the same as a default not being
        #  specified.
        @dataclass
        class C:
            x: int=field(default=MISSING)
        with self.assertRaisesRegex(TypeError,
                                    r'__init__\(\) missing 1 required '
                                    'positional argument'):
            C()
        self.assertNotIn('x', C.__dict__)

        @dataclass
        class D:
            x: int
        with self.assertRaisesRegex(TypeError,
                                    r'__init__\(\) missing 1 required '
                                    'positional argument'):
            D()
        self.assertNotIn('x', D.__dict__)

    def test_missing_default_factory(self):
        # Test that MISSING works the same as a default factory not