gistfile1.cs

    [Subject(typeof(Inventory), "customer swapping garment")]
    public class GarmentSpecifications
    {
        private static Inventory _inventory;

        Establish context = () =>
        {
            // Establish the context for our test case, set up the required objects, etc.
            _inventory = new Inventory();
            _inventory.Add(GarmentColor.Black, 3);
            _inventory.Add(GarmentColor.Blue, 2);
        };

        // The mutation our test case performs, which should produce the asserted result.
        // The "Because" (or Act) block should be the _only_ block to modify state!
        Because of = () => _inventory.TradeIn(GarmentColor.Blue, GarmentColor.Black);

        // We assert whether our premises are indeed correct.
        It should_have_three_blue_garments_in_stock = () => _inventory.Stock[GarmentColor.Blue].ShouldEqual(3);
        It should_have_two_black_garments_in_stock = () => _inventory.Stock[GarmentColor.Black].ShouldEqual(2);
    }