[zaarn]

I mean, I general don't think you should write fuzzers for absolutely everything (most contained functions => doesn't touch a lot of other stuff and few parameters with a known parameter space)

The general solution is to use whatever testing methodology you are comfortable, that is very effective, very efficient and covers a lot of problem space. Of course no testing method does that so you'll have to constantly balance whatever works best (which is why I think pure TDD is overrated)