[ARROW-18127] [CI][Python] Have a way to reproduce hypothesis failures from CI

• Type: Test
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Continuous Integration, Python
• External issue URL: https://github.com/apache/arrow/issues/33324
• Assignee: Unassigned
• Reporter: Joris Van den Bossche
• Created: 21/Oct/22 12:34
• Updated: 11/Jan/23 11:58

Description

We have a nightly test build with hypothesis enabled, and those tests fail / crash from time to time, eg https://github.com/ursacomputing/crossbow/actions/runs/3286024804/jobs/5413689973

Ideally, if there is such a failure, we should actually fix that test case. But that requires us to be able to reproduce the failure locally.
If it's an actual test failure, hypothesis should print some information to re-run it locally with the same input (https://hypothesis.readthedocs.io/en/latest/reproducing.html#reproducing-an-example-with-reproduce-failure).
But if it is segfaulting, this information is not printed by default.

Another idea might to save the ./hypothesis/examples directory as artifact on the CI build, to use it locally, but probably that might have the same issue of not having the information we need in case of a crash.