I recently have had to set this up on another machine so here is a little guide which might help you if you want to setup growl notification of autotest results.
Make sure growlnotify is installed you will find it in the Extras directory of the Growl dmg (copy growlnotify to /usr/local/bin to test this open a terminal and type growlnotify)
Add the following to a file called ~/.autotest
Extract this file to ~/.autotest_images directory.