Book Image

JavaScript Unit Testing

By : Hazem Saleh
Book Image

JavaScript Unit Testing

By: Hazem Saleh

Overview of this book

<p>The largest challenge for many developers’ day to day life is ensuring the support of, and assuring the reach of, their product. With the ever increasing number of mainstream web browsers this is becoming a more difficult task for JavaScript coders. <br /><br />From the beginning, JavaScript Unit Testing will show you how to reduce the time you spend testing, and automate and ensure efficiency in guaranteeing your success.<br /><br />JavaScript Unit Testing will introduce and help you master the art of efficiently performing and automating JavaScript Unit tests for your web applications.<br /><br />Using the most popular JavaScript unit testing frameworks, you will develop, integrate, and automate all the tests you need to ensure the widest reach and success of your web application.<br /><br />Covering the most popular JavaScript Unit testing frameworks of today, JavaScript Unit Testing is your bible to ensuring the functionality and success of all of your JavaScript and Ajax Web Applications.<br /><br />Starting with Jasmine, you will also learn about, and use, YUITest, QUnit, and JsTestDriver, integrate them into your projects, and use them together to generate reports.<br /><br />Learn to automate these tools, make them work for you, and include the power of these tools in your projects from day one.</p>
Table of Contents (12 chapters)

Assertions


An assertion is a function that validates a condition if the condition is not valid; it throws an error that causes the test function to fail. A test function can include one or more assertions; all the assertions have to pass in order to have the test function pass. In the first QUnit test example, we used the QUnit equal and raises assertions. In this section, the most important QUnit built-in assertions will be illustrated in more detail.

The ok assertion

The ok assertion takes two parameters. The first parameter is a condition and the second parameter is optional and represents the message that is to be displayed with the test. The ok assertion is passed if the condition is true. For example, the following examples will pass:

ok(true, "true passes");
ok(4==4, "4 must equal 4");
ok("some string", "Non-empty string passes");  

The equal and notEqual assertions

The equal assertion has three parameters; the first two parameters represent the actual and expected values, and the third...