Autotest is a simple tool that automatically links tests with the files being tested, and runs tests automatically when either the test or code has changed.

If you are running on a Mac and have growlnotify installed, install the ZenTest gem, then copy the config file to ~/.autotest (or just run rake in this directory).

Once you have autotest installed, change to the root of your Puppet git repository and run autotest with no arguments. To refresh the list of files to scan, hit ^c (that is, control-c).

It's recommended you leave this running in another terminal during all development, preferably on another monitor.