Android Testing with Robolectric and Dagger

Question

I am trying to write an Android application using Dagger. Trying to follow the TDD approach, I started writing a test for my First activity. For writing tests I am using Robole

Answer 1

Seems like you're looking for module override (like Roboguice does). I couldn't find any, but in my tests, I've been using something like this:

MyObjectTest.java

@Test
public void testMyObject() {
    ObjectGraph objectGraph = ObjectGraph.create(new TestModule());
    MyObject object = objectGraph.get(MyObject.class);
    assertNotNull(object);
    assertEquals("Received message from MyObjectTestImpl", object.getMessage());
}

TestModule.java

public class TestModule {
    @Provides
    public Library provideMyObject() {
        return new MyObjectTestImpl();
    }
}

If MyObject is used in an Activity, I can also test it:

@RunWith(RoboGradleTestRunner.class)
public class RoboTest {
    @Test
    public void testTextView() {
        MainActivity activity = (MainActivity) Robolectric.buildActivity(MainActivity.class).create().get();

        assertEquals("Received message from MyObjectTestImpl", activity.getMyObject().getMessage());
    }
}