From all the JavaScript testing frameworks I fiddled with (Mocha, Jasmine, Buster.js, Karma, ZombieJs, Yeti, YUITest) I'm really fond of QUnit. It's dead simple in usage, but nonetheless pretty powerful. For anyone who wants to start with Qunit "in no time" that may be the book as it is built of step-by-step instructions and practical examples. For those who rather go with official API/Intro (which BTW are awesome) the book still may appear interesting as it gives a walk-through on yet essential but uncovered there subjects such as using and making QUnit plugins, running QUnit tests in the console, cross-browser distributed testing with QUnit and Bunyip, assigning QUnit target in a build script and setting up Jenkins to report build results during Continuous Integration and Deployment. As a bonus you can find in the book a template of using QUnit tests in automated build for a Github project