Unit Testing Android Apps

Transcript

1. Unit Testing Android Apps

2. @felipecsl Unit Testing Android Apps

3. None

4. 8MM+ downloads 210k reviews 4.5 ★ average rating

5. Android app 2 developers

6. Android não foi desenhado com testabilidade em mente.

7. None

8. 2. Técnicas 3. Ferramentas 1. Motivação

9. 1. Motivação

10. Você ainda não está convencido do valor de escrever testes

    automatizados. Premissa

11. Tranquilidade: Consigo dormir à noite?

12. Maintainability: Consigo alterar o código facilmente?

13. O que causa Débito Técnico? The three sins of software

    development: http://blog.ionelmc.ro/2014/08/14/the-three-sins-of-software-development/

14. Medo “Melhor não mexer nesse código…"

15. Arrogância “Eu sei o que estou fazendo!”

16. Estimativas irreais “Isso é barbada.”

17. Não se trata de encontrar bugs

18. TDD é um processo de design

19. Código bem desenhado é facilmente testável

20. S.O.L.I.D.

21. http://www.agileapps.co.uk/methodology/continuous.html Red, Green, Refactor

22. #isTDDdead http://martinfowler.com/articles/is-tdd-dead/ http://david.heinemeierhansson.com/2014/tdd-is-dead-long-live-testing.html http://blog.8thlight.com/uncle-bob/2014/04/25/MonogamousTDD.html

23. 2. Técnicas

24. http://martinfowler.com/bliki/TestPyramid.html

25. http://blog.stevensanderson.com/2009/08/24/writing-great-unit-tests-best-and-worst-practises/

26. 3. Ferramentas

27. Testes Unitários

28. None

29. build.gradle http://gradleplease.appspot.com/ Gradle, please

30. build.gradle buildscript { repositories { mavenCentral() } dependencies { classpath

    'org.robolectric:robolectric-gradle-plugin:0.12.0' } } apply plugin: 'robolectric'

31. build.gradle android { defaultConfig { // optional testInstrumentationRunner "com.example.MyAppTestRunner" }

    robolectric { include '**/*Test.class' } // optional sourceSets { androidTest { setRoot('src/test') } } }

32. build.gradle dependencies { compile 'com.android.support:appcompat-v7:20.0.0' // other dev dependencies... androidTestCompile

    'junit:junit:4.10' androidTestCompile 'org.robolectric:robolectric:2.4-SNAPSHOT' androidTestCompile 'org.mockito:mockito-core:1.9.5' androidTestCompile 'org.hamcrest:hamcrest-library:1.3' }

33. JUnit + Hamcrest @Config(emulateSdk = 18) @RunWith(MyTestRunner.class) public class UserTest

    { private User user; @Before public void setUp() { user = new User(); user.setId(3); } @Test public void userShouldPersistFields() { assertFalse(user.isPublicAccount()); assertThat(user.getId(), equalTo(3)); } }

34. Robolectric Shadow Objects

35. Robolectric @RunWith(RobolectricTestRunner.class) @Test public void shouldHaveALogo() throws Exception { ImageView

    pivotalLogo = (ImageView) activity.findViewById(R.id.pivotal_logo); ShadowImageView shadowPivotalLogo = Robolectric.shadowOf(pivotalLogo); assertThat(shadowPivotalLogo.resourceId, equalTo(R.drawable.pivotallabs_logo)); }

36. Mockito @Before public void setUp() { HttpClient httpClient = mock(httpClient.class);

    ApiEndpoint endpoint = new ApiEndpoint(httpClient); } @Test public void userShouldPersistFields() { when(httpClient.get("/users/2")).thenReturn(new User()); endpoint.getUser(2); verify(httpClient).get("/users/2"); }

37. http://www.confreaks.com/videos/659-rubyconf2011-why-you-don-t-get-mock-objects Assert on messages, not state. Mocks

38. Rodando testes ./gradlew test

39. Rodando uma classe de teste apenas ./gradlew test --tests \

    com.example.test.SomeClassTests

40. Bonus points: AssertJ Android assertThat(view).isGone(); assertThat(layout).isVisible() .isVertical() .hasChildCount(4) .hasShowDividers(SHOW_DIVIDERS_MIDDLE); https://github.com/square/assertj-android

41. Testes Funcionais

42. Ferramentas

43. Feature: Rating a stand Scenario: Find and rate a stand

    from the list Given I am on the foodstand list Then I should see a "rating" button Then I should not see "Dixie Burger & Gumbo Soup" When I touch the "rating" button Then I should see "Dixie Burger & Gumbo Soup" When I touch "Dixie Burger & Gumbo Soup" Then I should see details for "Dixie Burger & Gumbo Soup" When I touch the "rate_it" button Then I should see the rating panel When I touch "star5" And I touch "rate" Then "Dixie Burger & Gumbo Soup" should be rated 5 stars

44. Espresso Ferramentas

45. Integração Contínua

46. None
47. None

48. Test Cloud

49. Obrigado! @felipecsl http://felipecsl.com