Facebook does this to scale their tests, you can hear Katie Coons talking about it in CI at the end of https://www.youtube.com/watch?v=X0VH78ye4yY https://www.y

Facebook does this to scale their tests, you can hear Katie Coons talking about it in CI at the end of https://www.youtube.com/watch?v=X0VH78ye4yY https://www.youtube.com/watch?v=X0VH78ye4yY. There are also rules that say "if you changed this file, run all tests" for things like CI config and such. Also, the build tool Buck (https://buckbuild.com/ https://buckbuild.com/) enables this because it knows the graph and associates tests with the code they test...so you even get this test minimization locally as a developer (that is, outside CI) for free. I'm sure Bazel likely has a similar feature too.