Android functional testing with Dagger

Question

I’m trying to test an Activity with Mockito & Dagger. I have been able to inject dependencies to Activity in my application but when testing the Activity, I have not been a

Answer 1

I did some more experimenting and found out that Dagger is not able to create activity correctly when it is injected to test. In the new version of test, testDoSomethingCalledOnEngine passes but onCreate is not called on the MainActivity. The second test, testDoSomethingUI fails and there are actually two instances of MainActivity, onCreate gets called to the other instance (created by ActivityInstrumentationTestCase2 I quess) but not to the other. Maybe the developers at Square only thought about testing Activites with Robolectric instead of Android instrumentation test?

public class MainActivityTest extends
    ActivityInstrumentationTestCase2 {

@Inject Engine engineMock;
@Inject MainActivity mActivity;

public MainActivityTest() {
    super(MainActivity.class);
}

@Override
protected void setUp() throws Exception {
    super.setUp();

    // Inject engineMock to test & Activity under test
    ObjectGraph.create(new TestModule()).inject(this);
}


 @Module(
 includes = MainModule.class,
 entryPoints = MainActivityTest.class,
 overrides = true
 )

static class TestModule {
    @Provides
    @Singleton
    Engine provideEngine() {
        return mock(Engine.class);
    }
}

public void testDoSomethingCalledOnEngine() {
    when(engineMock.isLoggedIn()).thenReturn(true);
    mActivity.onSomethingHappened();
    verify(engineMock).doSomething();
}

@UiThreadTest
public void testDoSomethingUI() {
    when(engineMock.isLoggedIn()).thenReturn(true);
    mActivity.onSomethingHappened();
    Button btn = (Button) mActivity.findViewById(R.id.logoutButton);
    String btnText = btn.getText().toString(); 
    assertTrue(btnText.equals("Log out"));  
}

}