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