This is a very frequent discussion in my circle of hackers - to comment or not to comment. I'm on the "not to comment" side of things; either your tests or your code should speak for itself, if it's so complex that you need to leave a comment - you're doing it wrong.

I haven't seen this discussion on HN yet - so I wanted to get the opinion of so many people that write code day in and day out and may be responsible for maintaining code they haven't written themselves.