100% code coverage and even TDD'd doesn't and shouldn't mean 100% unit tested. Glue code and declaration doesn't need a unit test. Some functional tests should

100% code coverage and even TDD'd doesn't and shouldn't mean 100% unit tested. Glue code and declaration doesn't need a unit test. Some functional tests should provide all the coverage needed to give you confidence to refractor that code in the future. Edit: while I'm a huge TDD advocate, I'm not a big advocate of measuring code coverage. That should only be necessary if you are trying to get a code base under coverage that wasn't TDD'd. Even then I'd rather add the coverage as I'm touching uncovered code. If it works and I'm not touching it, it doesn't need tests.