How Android Testing changed how we think about death...

"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.

Transcript

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
   

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2. Who am I…
   •  Software Engineer
   •  GDG Barcelona Organizer
   •  Android lover
   •  Geek
   •  Gintonic fan…
   …y un pelotudo…
   

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3. Agenda?
   

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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.
   

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

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6. 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
   

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7. Mockito
   Build-operate-check pattern
   

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8. Mock initizalition
   

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9. Initizalition using mockito test runner
   

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10. Let’s verify some behaviour
    

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11. Argument matchers
    

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

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

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14. Spying on real objects
    

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15. Sounds familiar???
    

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

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17. Shadow Objects!
    

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18. View and Resource Loading…
    

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19. Shadow Activity
    Shadow ImageView
    

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

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21. Perform click Sample
    

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22. Started Activity test
    Should have fragment test
    

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23. Device Configuration Sample
    

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

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25. Creating your own shadows
    

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26. Creating your own shadows
    

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27. Creating your own shadows
    

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

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29. Sample: code to modify a bitmap
    

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30. Assertions with FEST
    

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31. 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?
    

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32. Dagger
    Directed
    Acyclic
    Graph
    

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33. Dagger Graph sample
    

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34. Dagger sample
    

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35. Declare dependencies
    

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36. Satisfy dependencies
    

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37. Build the graph
    

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38. Modules
    

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

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

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41. •  Robojuice
    •  Robotium
    •  Android Testing Framework
    •  UI Automator
    •  Monkey Runner
    More tools…
    

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42. 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…
    

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44. Questions?
    

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45. @fernando_cejas
    https://github.com/android10
    jobs@tuenti.com
    http://corporate.tuenti.com/es/dev/blog
    THANKS!!!
    

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