It is easy to explain: unit tests give a documented proof that you care about code robustness. It is used more for social and psychological effect than for its

It is easy to explain: unit tests give a documented proof that you care about code robustness. It is used more for social and psychological effect than for its advantages. In fact, outside a few domains, unit tests make it harder to evolve software because the more tests you write, the harder it is to make changes that move the design in a different direction. This is, by the way, my main problem with verbose techniques of programming: the more you have to code, the harder to make needed changes.