I think the best way to 'test deliver' your own items FREE,is to set the price of your item to 0L$,buy your own item,see if it gets delivered and has all the content in it,and when you're satisfied,edit the poduct/item to the original price you intended.
On the previous market place,you could test deliver to yourself by clicking a button,but that option is (to my knowledge) no longer available on SL Marketplace.