Yeah, ruby doesn't do well with parallelism, and if you want parallel tests, you're probably doing it in separate processes, because the ruby community chooses

Yeah, ruby doesn't do well with parallelism, and if you want parallel tests, you're probably doing it in separate processes, because the ruby community chooses to completely ignore everything that's known about how to write code that behaves well in parallel because "eh, I don't do it, so it must not be important".