This. Can also be applied to unit testing: the belief that if your code passes its unit tests, it will do exactly what you intend. I see way too many code base

This. Can also be applied to unit testing: the belief that if your code passes its unit tests, it will do exactly what you intend. I see way too many code bases that test things that are easy and xfail things that are hard because it turns out that you can’t just test your way to a complex product, but you sure can make yourself feel good by testing the fact that a dict acts like a dict.