ScannerFeatureDependenciesFake.java

// create implementation of ScannerFeatureDependencies
public class ScannerFeatureDependenciesFake implements ScannerFeatureDependencies {

    @Override
    public DbClientApi dbClient() {
        return new DbClientFake();
    }

    @Override
    public HttpClientApi httpClient() {
        return new HttpClientFake();
    }

    @Override
    public SomeUtils someUtils() {
        return CoreUtilsComponent.get().someUtils();
    }

    @Override
    public PurchaseInteractor purchaseInteractor() {
        return new PurchaseInteractorFake();
    }

}

// and initialize the graph somewhere in Application-file
public class ScannerExampleApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        ScannerFeatureComponent.initAndGet(
            // да, Даггер отлично съедает это =)
            new ScannerFeatureDependenciesFake()
        );
    }

}