Our software is modular and I have about 20 git repos in one project.
If a test fails, it is sometimes hard to find the matching commit since several developers work on these 20 repos.
I know the test worked yesterday and fails reproachable today.
Sometimes I use git-bisec, but this works only for one git repo.
Often changes in two git repos make a test fail.
I could write a dirty script which loops over my N git repos myself, but before doing so, I would like to know how experts would solve this.
I use Python, Django and pytest, but AFAIK this does not matter for this question.
I personally prefer to use repo tool to manage complex projects. Put those 20 repos in manifest.xml and each time when build starts create patch manifest if build fails do repo diff manifests to see what was changed and where.