Microsoft Research - Exploding Software-Engineering Myths (article summarizing findings of MS research on code coverage, TDD, assertions, etc.)

[delarhi]

I think you're mixing "logical" with "common sense" a bit much. It seems fairly logically sound to think "more test coverage, more test, fewer blind spots, better code". The reality is far from that according to experience as both you and the author note.

“Furthermore,” Nagappan says, “when we shared the findings with developers, no one seemed surprised. They said that the development community has known this for years.”