As web applications are using AJAX and effects to create a better UI for the user, more and more Javascript is being written.<p>I unit test most of my server side code with pyunit. But I haven't written a single test for my Javascript yet, but the amount of Javascript I have is almost 2x the amount of server side code.<p>If you do unit test your Javascript, what unit testing library are you using?
YUI has a small unit test framework that I use.
Also <a href="http://www.thefrontside.net/crosscheck" rel="nofollow">http://www.thefrontside.net/crosscheck</a> can be used to emulate browsers.