### Question:
ProductServiceImpl implements ProductService { @Override public Result<List<BrandEntity>> findBrands(BrandQueryReq brandQueryReq) { List<BrandEntity> brandEntityList = brandDAO.findBrands(brandQueryReq); if (CollectionUtils.isEmpty(brandEntityList)){ throw new CommonBizException(ExpCodeEnum.BRADN_SELETE_FAIL); } return Result.newSuccessResult(brandEntityList); }  @Override Result createProduct(ProdInsertReq prodInsertReq); @Override Result updateProduct(ProdUpdateReq prodUpdateReq); @Override Result<List<ProductEntity>> findProducts(ProdQueryReq prodQueryReq); @Override Result createCategoty(CategoryEntity categoryEntity); @Override Result modifyCategory(CategoryEntity categoryEntity); @Override Result deleteCategory(String categoryId); @Override Result createBrand(BrandInsertReq brandInsertReq); @Override Result modifyBrand(BrandInsertReq brandInsertReq); @Override Result<List<CategoryEntity>> findCategorys(CategoryQueryReq categoryQueryReq); @Override Result<List<BrandEntity>> findBrands(BrandQueryReq brandQueryReq); void checkBrandParam(BrandInsertReq brandInsertReq);  }### Answer:
@Test public void testFindBrands(){ BrandQueryReq brandQueryReq = new BrandQueryReq(); brandQueryReq.setBrand("学长"); productService.findBrands(brandQueryReq); System.out.println(); }