public void ScenarioFutureTest()
{
//define test input and output values
decimal expectedResult = 500;
IEnumerable <CartSKU> purchasedSKUs = GetPurchasedSKUs(ScenarioFuture);
IEnumerable <Promotion> activePromotions = GetActivePromotions();
PromotionEngine systemUnderTest = new PromotionEngine();
decimal actualResult = systemUnderTest.CalculateTotal(purchasedSKUs, activePromotions);
//verify the result
Assert.AreEqual(expectedResult, actualResult);
}