FireUnit

Unit testing is an integral part of building high-performance and efficient web applications. John Resig (creator of jQuery library) and Jan Odvarko have developed an excellent Firefox/Firebug extension called FireUnit which gives developers logging and testing capabilities via a simple JavaScript API. For those interested in the tool, you should also read Odvarko’s post detailing the usage of FireUnit.www.softwareishard.com/blog/firebug/fire...n-the-firebug-world/

Sugar Test

SugarTest makes it easy to write elegant and understandable JavaScript tests. Its API is inspired by both RSpec, Shoulda and jQuery. It works as a DSL running on top of JsUnitTest.
http://sugartest.scriptia.net/