Setting up Rspec, Autotest and Growl on Mac OS X

p> We have recently decided to use BDD for our upcoming projects. To make testing more fun and efficient I have hook up Growl with ZenTest’s autotest to display test results from Rspec. Some of the following instructions is taken from http://wincent.com/knowledge-base/Setting_up_autotest_to_use_Growl

What follows are the instructions to install the software to setup your own if you like to try out.
(Link: Setting up Rspec, Autotest and Growl on Mac OS X)