Book Image

Learning jQuery - Fourth Edition - Fourth Edition

Book Image

Learning jQuery - Fourth Edition - Fourth Edition

Overview of this book

To build interesting, interactive sites, developers are turning to JavaScript libraries such as jQuery to automate common tasks and simplify complicated ones. Because many web developers have more experience with HTML and CSS than with JavaScript, the library's design lends itself to a quick start for designers with little programming experience. Experienced programmers will also be aided by its conceptual consistency. LearningjQuery - Fourth Edition is revised and updated version of jQuery. You will learn the basics of jQuery for adding interactions and animations to your pages. Even if previous attempts at writing JavaScript have left you baffled, this book will guide you past the pitfalls associated with AJAX, events, effects, and advanced JavaScript language features. Starting with an introduction to jQuery, you will first be shown how to write a functioning jQuery program in just three lines of code. Learn how to add impact to your actions through a set of simple visual effects and to create, copy, reassemble, and embellish content using jQuery's DOM modification methods. The book will take you through many detailed, real-world examples, and even equip you to extend the jQuery library itself with your own plug-ins.
Table of Contents (24 chapters)
Learning jQuery Fourth Edition
About the Authors
About the Reviewers

Appendix B. Testing JavaScript with QUnit

Throughout this book we've written a lot of JavaScript code, and we've seen the many ways in which jQuery helps us write this code with relative ease. Yet whenever we've added a new feature, we've had to take the extra step of manually checking our web page to ensure that everything is working as expected. While this process may work for simple tasks, as projects grow in size and complexity, manual testing can become quite onerous. New requirements can introduce "regression bugs" that break parts of the script that previously worked well. It's far too easy to miss these bugs that don't specifically relate to the latest code changes because we naturally only test for what we've just done.

What we need instead is an automated system that runs our tests for us. The QUnit testing framework is just such a system. While there are many other testing frameworks, and they all have their own benefits, we recommend QUnit for most jQuery projects because it is written and maintained by the jQuery project. In fact, jQuery itself uses QUnit (running over 6,500 tests!). In this appendix, we will cover:

  • How to set up the QUnit testing framework within a project

  • Unit test organization to aid in code coverage and maintenance

  • The various types of tests available with QUnit

  • Common practices for ensuring that tests are reliable indicators of successful code

  • Suggestions for other types of testing beyond what QUnit offers