This chapter explains how to set up sophisticated browser testing tools and debug client‐side JavaScript. AngularJS is designed to make testing easy and provides a wide array of tools to help you ensure your application behaves correctly before bugs hit your production environment. Although AngularJS is built with an emphasis on basic unit tests, tools like Karma, ng‐scenario, and protractor enable you to test your application end‐to‐end in live browsers, either locally or against Sauce's browser provisioning service. AngularJS is built around a philosophy that automated testing should catch bugs before your users have a chance to run into them. The chapter explains the debug module and Chrome developer tools to debug applications. In addition to the ability to inspect the state of the DOM and read console output, Chrome allows you to perform more sophisticated debugging operations, such as breakpoints.