| class ExceptionIsLikeMixin: | |
| def assertExceptionIsLike(self, exc, template): | |
| """ | |
| Passes when the provided `exc` matches the structure of `template`. | |
| Individual exceptions don't have to be the same objects or even pass | |
| an equality test: they only need to be the same type and contain equal | |
| `exc_obj.args`. | |
| """ | |
| if exc is None and template is None: | |
| return | |
| if template is None: | |
| self.fail(f"unexpected exception: {exc}") | |
| if exc is None: | |
| self.fail(f"expected an exception like {template!r}, got None") | |
| if not isinstance(exc, ExceptionGroup): | |
| self.assertEqual(exc.__class__, template.__class__) | |
| self.assertEqual(exc.args[0], template.args[0]) | |
| else: | |
| self.assertEqual(exc.message, template.message) | |
| self.assertEqual(len(exc.exceptions), len(template.exceptions)) | |
| for e, t in zip(exc.exceptions, template.exceptions): | |
| self.assertExceptionIsLike(e, t) |