public void Delete() { PurchaseOrderController controller = new PurchaseOrderController(); PODETAIL podetail = new PODETAIL() { PONO = "PO02", ITCODE = "IT01", QTY = 5 }; controller.PostPOMASTER(new POMASTER() { PODATE = DateTime.Now, PONO = "PO02", SUPLNO = "SU01", PODETAILs = new List <PODETAIL>() { podetail } }); IHttpActionResult poMasters = controller.DeletePOMASTER("PO02"); var content = poMasters as OkNegotiatedContentResult <POMASTER>; Assert.IsNotNull(content); }