724f5ed903
There's some unittest-related functions that we heavily lean on that are deprecated: https://docs.python.org/3/library/unittest.html#deprecated-aliases This is a big find-and-replace that was restricted based on files that matched the pattern `*test*.py` and that weren't in any of the paths listed in `tools/rewriting/ThirdPartyPaths.txt`. Differential Revision: https://phabricator.services.mozilla.com/D138608