Hopefully not, because it is completely wrong. They are a way to check that what you test is not broken, which is usually not even remotely the same as "nothing

Hopefully not, because it is completely wrong. They are a way to check that what you test is not broken, which is usually not even remotely the same as "nothing is broken". I have seen so many pieces of code that didn't work in the real world but had many unit tests, good test coverage and were therefore "high quality" - yeah, sure.