Like you I was surprised to hear this is a thing or is even controversial. Admittedly I've only been programming for about 10 years, but I haven't heard (or see

Like you I was surprised to hear this is a thing or is even controversial. Admittedly I've only been programming for about 10 years, but I haven't heard (or seen) this come up even one time. Every test I've ever seen has usually had multiple mutations and assertions, all of them testing the same premise.