public void TestSpecialOffersCanBeAdded_Null()
{
// Arrange
ICheckout checkout = new Checkout();
// Act
checkout.AddSpecialOffer(null);
// Assert
Assert.Fail("ArgumentNullException was not thrown.");
}
public void CanApplySpecialOffer()
{
var item1 = new ItemBuilder().WithSku("A99").WithPrice(0.50m).Build();
var item2 = new ItemBuilder().WithSku("B15").WithPrice(0.30m).Build();
var item3 = new ItemBuilder().WithSku("B15").WithPrice(0.30m).Build();
var offer = new SpecialOffer {
Sku = "B15", Price = 0.45m, Quantity = 2
};
// this does require the offer to be added before scanning.
// However gives flexibility that you can add offers rather than them being set in the Checkout itself.
_itemUnderTest.AddSpecialOffer(offer);
_itemUnderTest.Scan(item1);
_itemUnderTest.Scan(item2);
_itemUnderTest.Scan(item3);
_itemUnderTest.Total().ShouldEqual(0.95m);
}
public void TestSpecialOffersAreApplied()
{
// Arrange
ICheckout checkout = new Checkout();
checkout.AddItem(new CheckoutItem("B", 30));
checkout.AddItem(new CheckoutItem("A", 50));
checkout.AddItem(new CheckoutItem("B", 30));
// Act
checkout.AddSpecialOffer(new MultiBuySpecialOffer(2, "B", 45));
// Assert
Assert.AreEqual(95, checkout.CalculateTotal());
}
public void TestSpecialOffersCanBeAdded()
{
// Arrange
ICheckout checkout = new Checkout();
checkout.AddItem(new CheckoutItem("B", 30));
checkout.AddItem(new CheckoutItem("A", 50));
checkout.AddItem(new CheckoutItem("B", 30));
// Act
checkout.AddSpecialOffer(new MultiBuySpecialOffer(2, "B", 45));
// Assert
Assert.AreEqual(1, checkout.SpecialOffers.Count);
}
public void TestSpecialOffersAreApplied_WithAdditionalItemsNotCoveredByOffer()
{
// Arrange
ICheckout checkout = new Checkout();
checkout.AddItem(new CheckoutItem("B", 30));
checkout.AddItem(new CheckoutItem("A", 50));
checkout.AddItem(new CheckoutItem("B", 30));
checkout.AddItem(new CheckoutItem("B", 30));
// Act
checkout.AddSpecialOffer(new MultiBuySpecialOffer(2, "B", 45));
// Assert
Assert.AreEqual(125, checkout.CalculateTotal());
}