You might also be interested in the unit testing framework that is part of qooxdoo, an open source RIA framework similar to Dojo, ExtJS, etc. but with quite a comprehensive tool chain.
Try the online version of the testrunner. Hint: hit the gray arrow at the top left (should be made more obvious). It's a "play" button that runs the selected tests.
To find out more about the JS classes that let you define your unit tests, see the online API viewer.
For automated UI testing (based on Selenium RC), check out the Simulator project.
