Learning Android™ Application Programming: A Hands-On Guide to Building Android Applications

Testing with JUnit

When you make changes to your code, how do you know they’ve worked and have been successful? Throughout this book you’ve made changes, fixed any errors, and then tested the On Your Bike app in the emulator or on your device to see whether the changes worked. But this practice can be prone to error. For example, you may miss errors or, even worse, introduce new errors.

There is a better way to test your app: by writing test scripts that test the entire app. These test scripts can be run over and over again, as needed, and can even be run automatically.

To test Android applications, you can use JUnit, an open source testing framework. It’s licensed under the Eclipse Public License and based on the many other xUnit unit-testing ...