I would love to read more about how the author is tackling the testing problem in their setup.

At work we have a pretty large project with many teams having moved to using nested git submodules for their stuff.

Whenever you checkout a commit you basically have do a `git submodule --init --recursive` and pray there's no random files left over because some submodule has moved and git-submodule thinks it's your job to clean up its mess. This becomes really annoying when you want to bisect something.

Surely there must be a saner way to deal with trees of git repos. I guess AOSP uses its own `repo` tool to do multirepo stuff which might be better. But honestly this _should_ be fixable in git-submodule itself if they just make it behave sanely.