Agreed. Unit tests are the one saving grace of Javascript, for me. I use Jasmine and CoffeeScript as well. The unit tests seem to only help me for the backend parts of my projects. In Javascript right now for me this is games, so there's a great deal of code that I haven't figured out how to unit test effectively-- specifically graphical stuff drawing on canvas. But CoffeeScript + Jasmine is truly wonderful. Fast, fun, it feels like I'm blasting out work faster than I ever have before in any other combination. It took a little while to figure out how to get Jasmine to test async things.