Don't Test Things That Are Unlikely to Break

Don't get crazy trying to cover all of your code and tests because it will make for terrible tests that don't increase the safety of your system. There are in terms of testing things that are unlikely to break. I actually like, I love unit tests as a way to be able to introduce error conditions that are very difficult to replicate in the real world,. But if you aren't sure of the source of those parameters, maybe it's not worth it.