id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	launchpad_bug
4190	Broken tests: failUnlessRaises has been deprecated	hacklschorsch	hacklschorsch	"`failUnlessRaises` has been deprecated in favor of `assertRaises`.

This breaks tests (see https://app.circleci.com/pipelines/github/tahoe-lafs/tahoe-lafs/5377/workflows/cd00a81d-54c3-43be-8041-719ea727c3f1).

Thanks @sajith for the pointer (both to the broken tests and the possible cause)!

{{{
2025-12-30 20:51:45 hacklschorsch   sajith: thanks for your link to > https://app.circleci.com/pipelines/github/tahoe-lafs/tahoe-lafs/5377/workflows/cd00a81d-54c3-43be-8041-719ea727c3f1
2025-12-30 20:53:20 hacklschorsch   Seems most failures here are due to ""[...] object has no attribute 'failUnlessRaises'"" - Maybe some dependency has changed?
2025-12-30 20:55:31 hacklschorsch   (in the windows builds)
2025-12-30 20:55:38 hacklschorsch   IIRC these worked until a while ago
2025-12-30 21:43:49 sajith  hacklschorsch: I am not 100% sure right now, but I think Python (unittest module maybe?) has deprecated failUnlessRaises in favor of assertRaises or something, and I suspect that we've ended up importing failUnlessRaises both from twisted.trial.unittest and stdlib unittest. Just a hypothesis. I don't have the time to check right now.
}}}"	defect	assigned	normal	undecided	unknown	n/a