@Test
public void should_call_get_ids_by_tracing_id_of_tracing_photo_dao() throws Exception {

    when(tracingPhotoDao.getIdsByTracingId(anyLong())).thenReturn(Collections.EMPTY_LIST);
    tracingPhotoService.getIdsByTracingId(123L);
    verify(tracingPhotoDao, times(1)).getIdsByTracingId(123L);
}