public async Task EditPurchase_Success_ReturnStatusCodeOk()
        {
            IHttpActionResult result = await purchaseController.Edit(new Guid("3bc4d343-1a0d-432f-a190-d8f76ebb1ab9"), new Purchase());

            HttpJsonApiResult <PurchaseViewModel> contentResult = result as HttpJsonApiResult <PurchaseViewModel>;

            Assert.AreEqual(HttpStatusCode.OK, contentResult.StatusCode);
        }