public void DetailsTest()
        {
            //Arrange
            Order_ItemController target = new Order_ItemController(); ;
            int expected = orderItem1.id;
            ViewResult actual;

            //Act
            actual = (ViewResult)target.Details(orderItem1.id);

            //Assert
            Assert.AreEqual(expected, ((order_item)actual.ViewData.Model).id);
        }