"Irreproducible bugs become highly reproducible right after delivery to the customer". This is something that happens "almost" everyday. It is well known that testing offers significant advantages as a development practice and helps ensure higher quality code with fewer defects. Unfortunately, testing Android apps can be challenging, so in this session we are gonna talk about available tools and practices that could help us accomplish our goals.

1. How ANDROID TESTING
changed how we think about
death…
@fernando_cejas
Code samples:
https://github.com/android10/Inside_Android_Testing
https://github.com/android10/AndroidApplicationTestingSample
Second Edition
android10.org

2. Who am I… • Software Engineer
• GDG Barcelona Organizer
android10.org
• Android lover
• Geek
• Gintonic fan…

3. Agenda?

4. Why testing..WTF?
• Testing increases the level of confidence in
your code.
• Testing makes it possible to write new code,
and refactor existing code, without worrying
that you’ve broken existing functionality.

5. • Unit testing
• Integration Testing
• Functional and System Testing
1. Stress Testing
2. Performance Testing
3. Usability Testing
• Acceptance Testing
• Regression Testing
1. Smoke Testing
Types of tests…

6. Martin Fowler:
"...test-doubles ... preprogrammed with
expectation"
What is this mock thing?

7. Mockito is a mocking framework that tastes
really good.
Mockito doesn't give you
hangover because the tests
are very readable and they
produce clean verification
errors.
GIVE A WARM
WELCOME TO…
mockito

8. Mockito
Build-operate-check pattern

9. Mock initizalition

10. Initizalition using mockito test runner

11. Let’s verify some behaviour

12. Argument matchers

13. Verifying number of invocations / at
least x / never

14. Making sure interaction(s) never
happened on mock

15. Spying on real objects

16. Sounds familiar???

17. Allows you to run your android
code on JVM.
Allows loading of Android
Classes in pure Java
Projects.
TO THE RESCUE…

18. Shadow Objects!

19. View and Resource Loading…

20. Shadow Activity
Shadow ImageView

21. • Uses real Android SDK code
• Styles and themes supported
• System resources are available
• Performance improved
• Bugs fixed
Robolectric 2.0+

22. Perform click Sample

23. Started Activity test
Should have fragment test

24. Device Configuration Sample

25. Network sample
Robolectric acts as a proxy!!!

26. Creating your own shadows

27. Creating your own shadows

28. Creating your own shadows

29. • A library by square (FTW!)
• It gives a chainable (or “fluent”)
syntax for checking assertions.
• Makes tests easier to write (and
read!).
FEST Android

30. Sample: code to modify a bitmap

31. Assertions with FEST

32. Dependency injection is a software design
pattern that allows the removal of hard-coded
dependencies and makes it possible to change
them, whether at run-time or compile-time
Dependency what?

33. Dagger
Directed
Acyclic
Graph

34. Dagger Graph sample

35. Dagger sample

36. Declare dependencies

37. Satisfy dependencies

38. Build the graph

39. Modules

40. Spoon
• Acceptance tests (black box)
• Automation of test execution across multiple
devices
• Aggregation of the results

41. Spoon
• Aggregation of screenshots while your tests
are running

42. • Robojuice
• Robotium
• Android Testing Framework
• UI Automator
• Monkey Runner
• Espresso
• Calabash
More tools…

43. WRITE TESTS!!!
• Simplify your architecture
• Have a robust testing strategy
• Use continuous integration tools
• Mock/stub functionality
• Create your own test runner
Best practices and some advice…

44. DO NOT LET YOUR CODE TO BE BROKEN…
DO NOT BREAK EXISTING FUNCTIONLITY…

46. Questions?

47. @fernando_cejas
https://github.com/android10
http://android10.org
THANKS!!!