I doubt devs working alone or in a small group can keep track of this stuff, at all. That's why I try to publicize significant things, so that they at least can tell when things are moving in some branch, and can go check it out, if it might effect them.

Once have the tests up, then you would just need to run the applicable tests for your implementation, once per week or month or so, and you could ignore the rest. Is the idea.