Skip to Main Content
jQuery Cookbook
book

jQuery Cookbook

by Cody Lindley
November 2009
Intermediate to advanced content levelIntermediate to advanced
480 pages
11h 50m
English
O'Reilly Media, Inc.
Content preview from jQuery Cookbook

Chapter 18. Unit Testing

Scott González

Jörn Zaefferer

Introduction

Automated testing of software is an essential tool in development. Unit tests are the basic building blocks for automated tests: each component, the unit, of software is accompanied by a test that can be run by a test runner over and over again without any human interaction. In other words, you can write a test once and run it as often as necessary without any additional cost.

In addition to the benefits of good test coverage, testing can also drive the design of software, known as test-driven design, where a test is written before an implementation. You start writing a very simple test, verify that it fails (because the code to be tested doesn’t exist yet), and then write the necessary implementation until the test passes. Once that happens, you extend the test to cover more of the desired functionality and implement again. By repeating those steps, the resulting code looks usually much different from what you’d get by starting with the implementation.

Unit testing in JavaScript isn’t much different from in other programming languages. You need a small framework that provides a test runner, as well as some utilities to write the actual tests.

18.1. Automating Unit Testing

Problem

You want to automate testing your applications and frameworks, maybe even benefit from test-driven design. Writing your own testing framework may be tempting, but it involves a lot of work to cover all the details and special requirements of testing ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

jQuery UI in Action

jQuery UI in Action

TJ VanToll
Head First jQuery

Head First jQuery

Ryan Benedetti, Ronan Cranley

Publisher Resources

ISBN: 9780596806941Supplemental ContentErrata Page