Expresso.tmbundle is a project mainly written in ..., it's free.
Simple TextMate bundle for Expresso JS testing framework.
Exercise TDD in Javascript with ease using TextMate.
==Installation
Install npm (instructions: http://howtonode.org/introduction-to-npm)
Install Expresso
npm install expresso
Copy this repo in your ~/Library/Application Support/TextMate/Bundles
Command+R on a JS file.