public void ReturnItemReturnNotRented()
        {
            var data = new List <Item>
            {
                new Item {
                    Id = 1, Name = "First"
                }
            }.AsQueryable();

            var mockSet = new Mock <DbSet <Item> >();

            mockSet.As <IQueryable <Item> >().Setup(m => m.Provider).Returns(data.Provider);
            mockSet.As <IQueryable <Item> >().Setup(m => m.Expression).Returns(data.Expression);
            mockSet.As <IQueryable <Item> >().Setup(m => m.ElementType).Returns(data.ElementType);
            mockSet.As <IQueryable <Item> >().Setup(m => m.GetEnumerator()).Returns(data.GetEnumerator());

            var mockContext = new Mock <SkiResortContext>();

            mockContext.Setup(c => c.Items).Returns(mockSet.Object);

            var controller = new RentalController(mockContext.Object);

            var item = controller.GetItem(1);

            controller.ReturnItem(item.Id);


            Assert.AreEqual("Not Rented", item.Status);
        }