Application testing is the process by which a developed software application is tested to assert its software quality. Many factors contribute to software quality. Such factors include application usability, functionality, reliability, and consistency. A number of advantages arise from testing an Android application. These advantages include but are not limited to:

• Fault detection
• Increased software stability

The integrals of Android application testing span far and wide, and, as such, are beyond the scope of this book. Nevertheless, the following is a list of Android-testing resources you may choose to (and probably should) explore in your free time:

• Espresso (https://developer.android.com/training/testing/espresso/index.html)
• Roboelectric (http://robolectric.org)
• Mockito (http://site.mockito.org)
• Calabash (https://github.com/calabash/calabash-android)