Shells are one of the more difficult objects to properly unit test. Since they normally run in a CLI context instead of a web context they provide some interesting challenges. The biggest hurdles are separating the Shell from the CLI environment, and simulating the correct arguments and parameters.

Previously, I wrote about using two versions of PHP with macports . In it I covered installing PHP4 and PHP5. Since then PHP5.3 has been released as a stable release. However, I needed to maintain my PHP5.2 installation as I have a number of client projects that are on servers using PHP5.2. So to reduce version insanity I wanted to keep 5.2.