public void CalculateDiscountToApply_LessThanQualifyingQuantity_NoDiscount()
{
var mockStockItem = new Mock <IStockItem>();
mockStockItem.Setup(m => m.UnitPrice).Returns(20m);
var promotion = new FixedPricePromotion(qualifyingQuantity: 3, price: 40);
var result = promotion.CalculateDiscountToApply(mockStockItem.Object, 2);
Assert.That(result, Is.EqualTo(0m));
}
public static void Price_VariousScenarios_PriceComputedCorrectly(int quantity, decimal rate, decimal expectedUnitPrice, string expectedItemId)
{
// Arrange
var promotion = new FixedPricePromotion(expectedItemId, quantity, rate);
// Act
var actualPrice = promotion.Price;
var actualUnitPrice = promotion.UnitPrice;
var actualItemId = promotion.ItemId;
//Assert
Assert.That(actualPrice, Is.EqualTo(rate));
Assert.That(actualUnitPrice, Is.EqualTo(expectedUnitPrice));
Assert.That(actualItemId, Is.EqualTo(expectedItemId));
}
