我的Controller其中一個方法如下，入?yún)⒅皇荂ommonsMultipartFile 類型，請問在單元測試中如何構(gòu)造CommonsMultipartFile 實例進(jìn)行單元測試@ModelAttributepublic PicUpload get(@RequestParam(required = false) String id,@RequestParam(required = false) CommonsMultipartFile picupload) {PicUpload entity = null;if (StringUtils.isNotBlank(id)) {entity = picUploadService.get(id);}if (entity == null) {entity = new PicUpload();}return entity;}