Ah, when I first began to read this, I expected one of those rants against unit tests which don't leave any kinda good thing about tests and I mentally got ready to comment about that.

However, I am quire pleased that this is a very sensible and mature position about unit testing (I think a short version would be: well, testing can help, it won't carry you and you have to stand on your own feet, but it can help), which is pretty close to my own position. Good Article.