#32558: Fail tests when unhandled thread exceptions occur
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Reporter: Adam Johnson | Owner: nobody
Type: New feature | Status: new
Component: Testing framework | Version: dev
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Pair of #32557 and its discussion.
In Python it's possible for a thread to be started, quit with an
exception, and this exception never get seen since the main thread doesn't
call `join()` on the failed thread.
Since Python 3.8 it's possible to detect such a case by installing a hook
at `threading.excepthook`:
https://docs.python.org/3.9/library/threading.html#threading.excepthook
pytest recently added such a hook, alongside the unraisable exception
hook: https://github.com/pytest-dev/pytest/pull/8055
I think we can do similarly here, since an exception in a non-main thread
could indicate a problem with code. This is especially pertinent in the
async world where sync code can be run in threads through `sync_to_async`
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Ticket URL: <https://code.djangoproject.com/ticket/32558>
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