| [case testDundersNotImplemented] | |
| # This case is special because it tests the behavior of NotImplemented | |
| # used in a typed function which return type is bool. | |
| # This is a convention that can be overridden by the user. | |
| class UsesNotImplemented: | |
| def __eq__(self, b: object) -> bool: | |
| return NotImplemented | |
| def test_not_implemented() -> None: | |
| assert UsesNotImplemented() != object() | |
| x = UsesNotImplemented() == object() | |
| assert not x |