BUG: fix an edge case where ExceptionInfo._stringify_exception could crash pytest.raises #11879
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testing/acceptance_test.py
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| from urllib.error import HTTPError | ||
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| with pytest.raises(HTTPError, match="Not Found"): | ||
| raise HTTPError(code=404, msg="Not Found", fp=None, hdrs=None, url="") # type: ignore [arg-type] |
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I resorted to turning off mypy here because it reported that hdrs is supposed to be of type Message, but I have no idea where that type comes from (and it's not just an alias for str).
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wow, the inheritance tree of that exception is absolutely WILD, terrifying - i'd consider this a cpython upstream bug as well |
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Agreed, but I have limited time on my hands right now. I can't escalate this to CPython folks until Wednesday, so anyone is welcome to beat me to it. |
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I think of this as implementing a workaround for a bug in old versions of CPython, and would argue against hiding bugs in exception types more generally. Better for such bugs to be noticed and fixed as quickly as possible, meaning that having pytest fail on this is actually pretty helpful! I'd suggest taking a tightly-scoped approach, which you could crib from my implementation in agronholm/exceptiongroup#58. Notably this means we'll be able to take the workaround out again when we drop support for the affected Python versions, and easily know to do so by grepping for the version comparison, without introducing new failures for other broken exception classes. |
…crash pytest.raises
Co-authored-by: Bruno Oliveira <[email protected]>
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Thanks for picking this up ! |
Closes #11872
Thanks @bluetech for your guidance !