aikcharJan 16
Borutzki

Ever wondered how to parametrize exception testing in PyTest?

Try this:
https://borutzki.github.io/2026/01/15/how-to-parametrize-exception-testing-in-pytest.html

#DailyPythonista #python #programming #Pytest #TDD #unittest

Jan 15 at 5:05pmWeb
Show threadPaul HutchingsJan 16
@borutzki TIL about nullcontext, and no longer have to split tests between pass/fail scenarios
Show threadBorutzkiJan 16
@studiop but remember that with great power comes great responsibility ;)
Show threadBlairJan 16
@borutzki Cool! Can you test the result though, e.g. assert x/y == pytest.approx(blah)?
Show threadHugo van KemenadeJan 16
@blair @borutzki Yes, something like this:
Show threadBorutzkiJan 16
@hugovk @blair exactly, nothing stops you from doing the standard assertion.
Show threadNed BatchelderJan 25
@borutzki Thanks, this is great. I tweaked it in a blog post: https://nedbatchelder.com/blog/202601/testing_exceptions_and_caches
Testing: exceptions and caches

Nicer ways to test exceptions and to test cached function results.

Show threadBorutzkiJan 26
@nedbat nice! I'm glad to be useful! ;)