### Question:
ScanDevicesUseCase { public Observable<Device> execute() { Observable<Device> unownedObservable = iotivityRepository.scanUnownedDevices(); Observable<Device> ownedObservable = iotivityRepository.scanOwnedDevices(); Observable<Device> ownedByOtherObservable = iotivityRepository.scanOwnedByOtherDevices(); return Observable.concat(unownedObservable, ownedObservable, ownedByOtherObservable); } @Inject  ScanDevicesUseCase(IotivityRepository iotivityRepository); Observable<Device> execute();  }### Answer:
@Test public void execute() { }