Android TDD

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A discussion about unit testing strategies and test-driven development on the Android platform including: * Unit Testing & TDD Overview * Android Testing Framework * JUnit 4 + POJO Library * Robolectric

Technology Education

Android TDD
January 25, 2012
Chuck Greb
@ecgreb

Test smallest possible units of code
(in isolation)

Makes refactoring easier
(regression suite)

Testing Approaches
● F@#% It!
● Manual
● Monkey Testing
● Android Testing Framework
● JUnit 4 + POJOs
● Robolectric
● Custom

Test Case Classes
● TestCase
● AndroidTestCase
● ActivityTestCase
● ActivityUnitTestCase
● ServiceTestCase
● ProviderTestCase2
● ActivityInstrumentationTestCase2

Compile, dex, package, and install
two APKs on emulator or device

Additional Challenges
● Classes and methods declared final
● Lack of interfaces
● Non-public constructors
● Static methods

Robolectric
Test-Drive Your Android Code

Resources
● developer.android.com/guide/topics/testing
● junit.org
● pivotal.github.com/robolectric

Reading
● Robert C. Martin (Uncle Bob)
● Michael Feathers
● Kent Beck

Chuck Greb
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http://ecgreb.com/blog
https://github.com/ecgreb/StringBling

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Android TDD

1. Android TDD January 25, 2012 Chuck Greb @ecgreb

2. Why Test?

3. Validate Requirements

4. Ensure Quality

5. Reduce Cost

6. Why Unit Test?

7. Test smallest possible units of code (in isolation)

8. Makes refactoring easier (regression suite)

9. Self-documenting code

10. Fakes Mocks Stubs

11. Why TDD? (Test-Driven Development)

12. Improves Architecture

13. Reduced debugging time

14. Red -> Green -> Refactor

15. Tests must be fast!

16. Other kinds of tests?

17. Inverted Testing Pyramid

18. (Un-Inverted) Testing Pyramid

19. QA Job Security

20. Unit Testing is Awesome!!

21. Testing Approaches ● F@#% It! ● Manual ● Monkey Testing ● Android Testing Framework ● JUnit 4 + POJOs ● Robolectric ● Custom

22. Testing Approaches ● F@#% It! ● Manual ● Monkey Testing ● Android Testing Framework ● JUnit 4 + POJOs ● Robolectric ● Custom

23. Android Testing Framework

24. JUnit 3 + Instrumentation

25. Android Testing Framework

26. Test Case Classes ● TestCase ● AndroidTestCase ● ActivityTestCase ● ActivityUnitTestCase ● ServiceTestCase ● ProviderTestCase2 ● ActivityInstrumentationTestCase2

27. Android Mocks

28. HelloAndroidActivity

29. main.xml

30. StringBling

31.

32. HelloAndroidActivityTest

33. Success!!!

34. Compile, dex, package, and install two APKs on emulator or device

35. Additional Challenges ● Classes and methods declared final ● Lack of interfaces ● Non-public constructors ● Static methods

36. JUnit 4 + POJOs

37. HelloAndroidActivityJUnitTest

38.