public void ScenarioSix()
        {
            decimal totalCost = testBasket6.CalculateDiscountedTotalCost();

            Assert.AreEqual(3.20m, totalCost);
        }
        public void ScenarioFive()
        {
            decimal totalCost = testBasket5.CalculateDiscountedTotalCost();

            Assert.AreEqual(16.150m, totalCost);
        }
        public void ScenarioThree()
        {
            decimal totalCost = testBasket3.CalculateDiscountedTotalCost();

            Assert.AreEqual(3.45m, totalCost);
        }
        public void ScenarioFour()
        {
            decimal totalCost = testBasket4.CalculateDiscountedTotalCost();

            Assert.AreEqual(9.00m, totalCost);
        }
        public void ScenarioOne()
        {
            decimal totalCost = testBasket1.CalculateDiscountedTotalCost();

            Assert.AreEqual(2.95m, totalCost);
        }