Update Testing Section

[peter-tackage]

The testing section is out of date.

We should update it and address at least the following topics and tools:

• Unit Testing using JUnit 4
• Mocking, using Mockito
• Assertions using AssertJ
• Recommend not to use Roboletric for business logic testing
• RxJava testing using TestScheduler and TestSubscriber
• Patterns to improve testability
• UI testings with Espresso
• Unit testing structure best practices

[mehrdad-shokri]

hey, I Also recommend to using hamcrest along with assertj android for more readable unit and instrumented tests.
there should be a best practices on instrumented tests reviewing how to test activites, services and application context.
I'm not aware if I can suggest more improvements for testing section or you just mind futurice developer's opinion. So please mention me if you want to get some more hints. tnx.

[wviana]

there should be a best practices on instrumented tests reviewing how to test activites, services and application context.
+1