Robolectric

In the Android application-development world, Robolectric is a unit-testing framework that has been used by multiple teams within our technical community. It offers the best option among those available for writing real unit tests that extend or interact directly with Android components and support JUnit tests. We caution, though, that because it is an implementation of the Android SDK, there might be device-specific issues for some tests that pass in Robolectric. To manually mock all the Android dependencies, ensuring only test of the system-in-test will require a lot of complex code, and this framework addresses this effectively.