public void Given_BulkDiscountIsCreated_ThenReturnsBaseClassType()
{
var product = new ProductUnit("Book", 10.0m);
var bulkDiscount = new BulkDiscount(product, "Buy 2 gets 1 free", 2, 1);
Assert.IsAssignableFrom <Discount>(bulkDiscount);
}
private IFinalPrice UseBulkDiscount(IFinalPrice cart, ref string view)
{
var bulkDiscount = new BulkDiscount(cart, _discountVariablesRepository);
bulkDiscount.AdjustPriceByBulkDiscount();
view += "Bulk discount adjustment : $" + cart.GetAdjustment() * -1 + " \n";
view += "Price after bulk discount : $" + cart.GetFinalPrice() + " \n";
return(bulkDiscount.AdjustedCart);
}
public void Given_BulkDiscount_WhenCreateBulkDiscount_ThenReturns_BulkDiscountObject()
{
var product = new ProductUnit("Book", 10.0m);
var bulkDiscount = new BulkDiscount(product, "Buy 2 gets 1 free", 2, 1);
Assert.NotNull(bulkDiscount.Product);
Assert.Equal("Buy 2 gets 1 free", bulkDiscount.Name);
Assert.Equal(2, bulkDiscount.ThresholdQuantity);
Assert.Equal(1, bulkDiscount.QuantityOff);
}
public void Cannot_calculate_bulk_discount_for_invalid_cart_products_list()
{
//setup
var bulkDiscountProduct = new Product(code: "9501101530003", name: "Nutella", price: 5);
var bulkDiscountList = new BulkDiscount(bulkDiscountProducts: new[] { bulkDiscountProduct }, quantity: 2);
Assert.Throws <ApplicationException>(() =>
bulkDiscountList.Calculate(cartProducts: null, cartSubtotal: 100));
Assert.Throws <ApplicationException>(() =>
bulkDiscountList.Calculate(cartProducts: new List <CartProduct>(), cartSubtotal: 100));
}
public void Can_calculate_price_for_bulk_discount_product()
{
//setup
var product = new Product(code: "9501101530004", name: "Nutella", price: 5);
var bulkDiscountList = new BulkDiscount(bulkDiscountProducts: new[] { product }, quantity: 3);
var sut = new CashRegister(products: new[] { product }, discounts: new [] { bulkDiscountList });
//act
sut.Scan(product.Code);
sut.Scan(product.Code);
sut.Scan(product.Code);
var totalPrice = sut.CalculatePrice();
//3 * 5 - 5 = 10
Assert.That(totalPrice, Is.EqualTo(10m));
}
public void Can_calculate_price_for_bulk_discount_product_and_regular_price_product()
{
//setup
var regularPriceProduct = new Product(code: "9501101530004", name: "Chewing gum", price: 1.50m);
var bulkDiscountProduct = new Product(code: "9501101530003", name: "Nutella", price: 5);
var bulkDiscountList = new BulkDiscount(bulkDiscountProducts: new[] { bulkDiscountProduct }, quantity: 2);
var sut = new CashRegister(products: new[] { regularPriceProduct, bulkDiscountProduct }, discounts: new[] { bulkDiscountList });
//act
sut.Scan(regularPriceProduct.Code);
sut.Scan(regularPriceProduct.Code);
sut.Scan(bulkDiscountProduct.Code);
sut.Scan(bulkDiscountProduct.Code);
sut.Scan(bulkDiscountProduct.Code);
var totalPrice = sut.CalculatePrice();
//(1.50 * 2) + (5 * 3) - 5 = 13
Assert.That(totalPrice, Is.EqualTo(13m));
}
public void Can_get_several_bulk_discounts()
{
/* TODO: need to implement further calculation for cases
* like the following:
* if product quantity required to get a discount is 2, but
* shopping cart has 4 such products
*/
//setup
var product = new Product(code: "9501101530004", name: "Nutella", price: 5);
var bulkDiscountProduct = new BulkDiscount(bulkDiscountProducts: new[] { product }, quantity: 2);
var sut = new CashRegister(new[] { product }, new[] { bulkDiscountProduct });
//act
sut.Scan(product.Code);
sut.Scan(product.Code);
sut.Scan(product.Code);
sut.Scan(product.Code);
var totalPrice = sut.CalculatePrice();
Assert.That(totalPrice, Is.EqualTo(10));
}
