Most unit tests don't test functionality at the business requirement level. Most unit tests I've seen are more fine grained. I think keeping your requirement

Most unit tests don't test functionality at the business requirement level. Most unit tests I've seen are more fine grained. I think keeping your requirement documentation as comments on unit tests that are a literal translations of those documentations is amazing and very helpful. But I would argue that represents in my experience just 10% of the unit tests I see. Instead I see a lot more testing of implementation details.