What testing framework do you use for building (xmpp) web apps?

The code in the whole book comes without any tests. For tiny applications this might be not necessary but for more complex systems (e.g. chesspark) some stability aspects are certainly important. Unlike other programming languages (e.g. c, java, ...) we don't compile the code (...and can check with it some basic mistakes) . Moreover we have a lot of events that rises more or less randomly. So how can we get a grip on this?

At Collecta, we tend to use QUnit from the jQuery folks. That is also used in Strophe's own tests. I have also been investigating tools like JsTestDriver, which make multibrowser testing easier and make the testing process significantly faster.

I've also done some testing with Windmill and Strophe, and it worked very well.