#Dagger 2 and Realm unit test

🎉 Updated with Realm v1.x!! <-- Robolectric/Realm issue

Sample Android application of Dagger 2 and Realm tested with Robolectric, Mockito and PowerMockito.

Example

@RunWith(RobolectricGradleTestRunner.class)
@Config(application = CustomApplicationTest.class, constants = BuildConfig.class, sdk = 21)
@PowerMockIgnore({"org.mockito.*"})
@PrepareForTest({Injector.class})
public class MessageRepositoryTest {

    @Rule
    public PowerMockRule rule = new PowerMockRule();

    @Inject
    MessageRepository messageRepository;

    @Inject
    DatabaseRealm databaseRealm;

    @Before
    public void setupDagger() {
        ApplicationComponentTest applicationComponentTest = DaggerApplicationComponentTest.builder()
            .applicationContextModuleTest(new ApplicationContextModuleTest())
            .repositoryModuleTest(new RepositoryModuleTest(false))
            .build();

        PowerMockito.mockStatic(Injector.class);
        PowerMockito.when(Injector.getApplicationComponent()).thenReturn(applicationComponentTest);

        ((ApplicationComponentTest) Injector.getApplicationComponent()).inject(this);
    }

    @Test
    public void messageRepository_add() {
        String MESSAGE_UUID = "UUID";
        String MESSAGE_CONTENT = "CONTENT";
        String MESSAGE_INFO = "INFO";
        MessageModel message = new MessageModel();
        message.setUuid(MESSAGE_UUID);
        message.setContent(MESSAGE_CONTENT);
        message.setInfo(MESSAGE_INFO);

        when(databaseRealm.add(message)).thenReturn(message);

        TestSubscriber<String> tester = new TestSubscriber<>();
        messageRepository.add(message).subscribe(tester);

        verify(databaseRealm).add(message);

        tester.assertValue(MESSAGE_UUID);
        tester.assertCompleted();
        tester.assertNoErrors();
    }

    @Test
    public void messageRepository_findAll() {
        MessageModel message1 = MessageModel.newBuilder().content("CONTENT1").build();
        MessageModel message2 = MessageModel.newBuilder().content("CONTENT2").build();
        List<MessageModel> messages = Arrays.asList(message1, message2);

        when(databaseRealm.findAll(MessageModel.class)).thenReturn(messages);

        TestSubscriber<List<MessageModel>> tester = new TestSubscriber<>();
        messageRepository.findAll().subscribe(tester);

        tester.assertValue(messages);
        tester.assertCompleted();
        tester.assertNoErrors();
    }

}

Setup Robolectric

• select test directory
• Build > Select Build Variant
• Test Artifact: Unit Tests

for Linux and Mac users:

• Edit Configurations > Working directory = $MODULE_DIR$