Another diff is coming which changes that behavior a bit 
I separated the pytest migration from that modification.
Build is green
Rebasing onto 66a61f3dd2...
Current branch diff-target is up to date.
commit 725c1fe4ad076c71d51d0c2998dcb4aaedd4b6bb Author: Antoine R. Dumont (@ardumont) <firstname.lastname@example.org> Date: Wed Sep 9 18:48:07 2020 +0200 test_utils: Migrate to pytest
See https://jenkins.softwareheritage.org/job/DLS/job/tests-on-diff/40/ for more details.