As a concrete automation example, we will adapt our existing Backbone.js test infrastructure to use PhantomJS. PhantomJS offers an amenable set of features and capabilities for Backbone.js testing—it is fast, relatively easy to set up, and provides a real (headless) browser. As a practical matter, larger Backbone.js applications often require a real browser engine to function properly, particularly applications that exercise the murkier and more complicated parts of the browser environment.