public void DeleteDelivery()
        {
            var deliveryService = new Mock <IDeliveryBusinessLayer>();

            deliveryService.Setup(x => x.GetDeliveryByID(1))
            .Returns(testdelivery);

            var controller = new DeliveryController(deliveryService.Object);

            IHttpActionResult actionResult = controller.DeleteDelivery(1);

            Assert.IsInstanceOfType(actionResult, typeof(OkNegotiatedContentResult <Delivery>));
        }