That is the only time I write unit tests. I never write them first run of software, but when I start changing the product down the track maintenance/upgrades/bu

That is the only time I write unit tests. I never write them first run of software, but when I start changing the product down the track maintenance/upgrades/bugs/what ever I'll add tests to make sure things don't explode, and hopefully I'm not introducing problems. That said often things are rushed and they get ignored, even when I'm low on confidence about said introductions of errors :P