Silvan Muhlemann has posted about the unit testing that tillate.com does for their releases - the whole process from start to finish.

For now over three years we are working with unit tests. I'd like to share some of those experiences. As we have two frameworks in place for our website, I can compare two different strategies for unit tests.

He talks about their choice of SimpleTest, their test monitoring, CruiseControl and their "if it doesn't pass, you can't release it" mentality to keep their site as bug free as possible.