ApplicationMock.java

public class ApplicationMock extends MyApplication {

    public void putActivityComponentBuilder(ActivityComponentBuilder builder, Class<? extends Activity> cls) {
        Map<Class<? extends Activity>, ActivityComponentBuilder> activityComponentBuilders = new HashMap<>(this.activityComponentBuilders);
        activityComponentBuilders.put(cls, builder);
        this.activityComponentBuilders = activityComponentBuilders;
    }
}