Bogus tests have to be caught in code review. When I talk about educating the team that's what I mean.
I've only ever had to do a test rotation once or twice, and it was like pulling the rip cord on a lawnmower. Requires effort at first and then it becomes self-sustaining over time. It establishes or affirms a culture of testing. The rotation doesn't even need to last long.
You should know which portions of the code are here to stay and which are nearing their end of life. Naturally, you want to spend your time where it will have maximum payoff.
I've only ever had to do a test rotation once or twice, and it was like pulling the rip cord on a lawnmower. Requires effort at first and then it becomes self-sustaining over time. It establishes or affirms a culture of testing. The rotation doesn't even need to last long.
You should know which portions of the code are here to stay and which are nearing their end of life. Naturally, you want to spend your time where it will have maximum payoff.