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>));
}