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DART Cookbook

DART Cookbook

By : Ivo Balbaert
4 (2)
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DART Cookbook

DART Cookbook

4 (2)
By: Ivo Balbaert

Overview of this book

If you are a Dart developer looking to sharpen your skills, and get insight and tips on how to put that knowledge into practice, then this book is for you. You should also have a basic knowledge of HTML, and how web applications with browser clients and servers work, in order to build dynamic Dart applications.
Table of Contents (13 chapters)
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12
Index

Unit testing a Polymer web app


A project should contain a number of automated tests that can be run after every code change to ensure that the previous functionality still works. Dart's unittest framework is the best tool for the job, and the Dart website has some excellent articles to get you started. However, testing Polymer web applications is a lot trickier because of the way Polymer works, as it hides HTML in shadow DOM and also because it works in an asynchronous fashion, independent of the testing code.

Getting ready

We will create some tests in the ClickCounter example (the standard web application template using the polymer library). You can find the code in the polymer1 app. We include the unittest library in the pubspec.yaml file, and create a test folder.

How to do it...

In the test folder, we create a test_polymer1.html page; a web page that loads the Polymer component required to test this functionality. The following is the minimum content required for the component:

<head&gt...

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