### Question:
ItemCatServiceImpl extends ServiceImpl<ItemCatMapper, ItemCat> implements ItemCatService { @Override public List<ItemCatDto> getByParentId(@NonNull Long pId, Integer limit) { List<ItemCat> itemCatList = itemCatMapper.selectByParentId(pId, null, limit); return convertService.convertItemCat(itemCatList); } @Autowired  ItemCatServiceImpl(ItemCatMapper itemCatMapper, ItemService itemService,
			ConvertService convertService); @Override List<ItemCatDto> getByParentId(@NonNull Long pId, Integer limit); @Override List<Long> getIdsByParentId(@NonNull Long pId, Integer limit); @Override List<List<ItemCatDto>> getRootCat(Integer catLimit, Integer itemLimit); @Override List<ItemCatDto> getByRemark(@NonNull String remark, Integer limit); @Override List<ItemCatDto> getItemCatWithItems(String remark, Integer catLimit,
			Integer itemLimit); @Override List<Long> getChildCatIds(Long itemCatId);  }### Answer:
@Test public void getByParentId() { }