Javascript becomes much more important to interactive website development then before (ok it has been for a while already) but the notion of testing that logic seems even further fetched then testing the code written in C#, Java. And this is something that is wrong as well. How do you test drive your javascript development, what do you need to think about to make it testable? This video demonstrates all these things including how easy it is to make your own fakes for testing. it demonstrates also the refactoring and changing behaviour becomes so much easier.And not to forget that the design of the code is much better as well.
Watch this streaming video from the Norwegian Developer Conference 2010