That's quite opposite for me, I write code with lots of tiny errors (most of them 0,1 based array sizes or not understanding how API works), so I test as much a

That's quite opposite for me, I write code with lots of tiny errors (most of them 0,1 based array sizes or not understanding how API works), so I test as much as possible. But tests true value is regression testing. I can refactor something, and test knowing that if I messed something up, test will flare up. I still try to avoid errors, but it's pretty much nigh impossible.