There are some great JavaScript testing frameworks out there. Many only work from within a browser. Most don’t support testing asynchronous code like event callbacks. Some have syntax that’s hard for JS developers or IDEs to understand.

Jasmine is a JavaScript testing framework. It’s heavily influenced by, and borrows the best parts of, ScrewUnit, JSSpec, JSpec, and of course RSpec. Jasmine is not tied to any browser, framework, platform, or host language. It work anywhere JavaScript can run, including browsers, servers, phones, etc.

Requirements: -
Demo: http://pivotal.github.com/jasmine/
License: MIT License