Unit Testing Android Apps

Transcript

1. Unit Testing Android Apps
2. @felipecsl Unit Testing Android Apps
4. 8MM+ downloads 210k reviews 4.5 ★ average rating
5. Android app 2 developers
6. Android não foi desenhado com testabilidade em mente.
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
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
48. Test Cloud
49. Obrigado! @felipecsl http://felipecsl.com