Unit Testing Android Apps

Transcript

1. Unit Testing
   Android Apps
   

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2. @felipecsl
   Unit Testing
   Android Apps
   

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

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5. Android app
   2 developers
   

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6. Android não foi desenhado
   com testabilidade em
   mente.
   

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8. 2. Técnicas
   3. Ferramentas
   1. Motivação
   

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9. 1. Motivação
   

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

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11. Tranquilidade:
    Consigo dormir à noite?
    

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12. Maintainability:
    Consigo alterar o código
    facilmente?
    

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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/
    

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14. Medo
    “Melhor não mexer nesse código…"
    

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

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16. Estimativas irreais
    “Isso é barbada.”
    

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17. Não se trata de
    encontrar bugs
    

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18. TDD é um
    processo de design
    

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19. Código bem desenhado é
    facilmente testável
    

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

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

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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
    

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23. 2. Técnicas
    

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

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

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26. 3. Ferramentas
    

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27. Testes Unitários
    

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

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30. build.gradle
    buildscript {
    repositories {
    mavenCentral()
    }
    dependencies {
    classpath 'org.robolectric:robolectric-gradle-plugin:0.12.0'
    }
    }
    apply plugin: 'robolectric'
    

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31. build.gradle
    android {
    defaultConfig {
    // optional
    testInstrumentationRunner "com.example.MyAppTestRunner"
    }
    robolectric {
    include '**/*Test.class'
    }
    // optional
    sourceSets {
    androidTest {
    setRoot('src/test')
    }
    }
    }
    

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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'
    }
    

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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));
    }
    }
    

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34. Robolectric
    Shadow Objects
    

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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));
    }
    

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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");
    }
    

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

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38. Rodando testes
    ./gradlew test
    

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

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

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41. Testes Funcionais
    

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42. Ferramentas
    

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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
    

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44. Espresso
    Ferramentas
    

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45. Integração Contínua
    

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48. Test Cloud
    

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

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