Keith Braithwaite has some nice insights on Don Knuth’s recent interview:

[…] anyone who reads that interview and thinks to themselves “ha! See! Knuth doesn’t unit test, so I don’t need to either” needs to consider a couple of things:
1. you aren’t Don Knuth
2. are you really prepared to do all the other stuff that Knuth does so that his programs still work without unit testing?
3. if so, whom do you imagine is going to pay for you to?

I’d add the fact that -without relying on tests- probably everyone else would go bankrupt if they pay $2.56 USD for each bug found in his or her work.