TestApp.java

public class TestApp extends OurApp {

    /** overrides method in OurApp that initializes our actual Dagger2 component */
    @Override
    protected void createComponents() {
        OurTestComponent component = mock(OurTestComponent.class);
        // required so our App init call works properly, which registers these callbacks
        // WOAH, this is responsible for the memory leak!! But why?
        when(component.activityLifecycleCallbacks())
                .thenReturn(mock(activityLifecycleCallbacks));
        OurApp.setComponent(component);
    }

}