public void ThatSkipsUnpricedItems()
{
var offer = new DiscountPricingOffer("test", .1, true);
var basketItemsByName = new Dictionary <string, BasketItemPrice>()
{
{
"test",
new BasketItemPrice {
Name = "test",
Quantity = 10
}
}
};
var results = new BasketPricingResults()
{
Messages = new List <string>()
};
offer.ApplyOffers(basketItemsByName, results);
var appliedDiscount = basketItemsByName["test"].Discount;
Assert.That(appliedDiscount, Is.Null);
}
public void ThatCanApplyDiscountsOnAllMatchingItems()
{
var offer = new DiscountPricingOffer("test", .1, true);
var basketItemsByName = new Dictionary <string, BasketItemPrice>()
{
{
"test",
new BasketItemPrice {
Name = "test",
UnitPrice = 150,
Quantity = 10
}
}
};
var results = new BasketPricingResults()
{
Messages = new List <string>()
};
offer.ApplyOffers(basketItemsByName, results);
var appliedDiscount = basketItemsByName["test"].Discount;
Assert.That(appliedDiscount, Is.EqualTo(150));
}
public void ThatMapsCollection()
{
var mapper = new PricingResultMapper();
var resultToMapFrom = new BasketPricingResults()
{
Messages = new[] { "test" }
};
var mappedResult = mapper.Map(resultToMapFrom);
CollectionAssert.AreEqual(resultToMapFrom.Messages, mappedResult.Messages);
Assert.That(mappedResult.Messages, Is.Not.SameAs(resultToMapFrom.Messages));
}
public void ThatCanSkipItemsThatAreNotUnderOffer()
{
var offer = new DiscountPricingOffer("test", .1, true);
var basketItemsByName = new Dictionary <string, BasketItemPrice>();
var results = new BasketPricingResults()
{
Messages = new List <string>()
};
offer.ApplyOffers(basketItemsByName, results);
Assert.That(results.Messages, Is.Empty);
}
public void ThatMapsProperties()
{
var mapper = new PricingResultMapper();
var resultToMapFrom = new BasketPricingResults()
{
FullPrice = 100,
DiscountedPrice = 50
};
var mappedResult = mapper.Map(resultToMapFrom);
Assert.That(mappedResult.SubTotal, Is.EqualTo(resultToMapFrom.FullPrice));
Assert.That(mappedResult.Total, Is.EqualTo(resultToMapFrom.DiscountedPrice));
CollectionAssert.AreEqual(resultToMapFrom.Messages, mappedResult.Messages);
}
public PricingResult Map(BasketPricingResults basketPricingResults)
{
if (basketPricingResults is null)
{
throw new System.ArgumentNullException(nameof(basketPricingResults));
}
return(new PricingResult
{
SubTotal = basketPricingResults.FullPrice,
Total = basketPricingResults.DiscountedPrice,
Messages = basketPricingResults.Messages == null ?
null :
new List <string>(basketPricingResults.Messages)
});
}
public void ThatCanSkipItemsThatAreNotUnderOffer()
{
var offer = new ConditionalOffer("aaa", 3, "bbb", .05m);
var basketItemsByName = new Dictionary <string, BasketItemPrice>()
{
{
"test",
new BasketItemPrice {
Name = "test",
UnitPrice = 150,
Quantity = 1
}
}
};
var results = new BasketPricingResults()
{
Messages = new List <string>()
};
offer.ApplyOffers(basketItemsByName, results);
}
public void ThatCanApplyOfferOnceOnly()
{
// 10% offer on bb if i take 3 aaa
var offer = new ConditionalOffer("aaa", 3, "bbb", .10m);
var basketItemsByName = new Dictionary <string, BasketItemPrice>()
{
{
"aaa",
new BasketItemPrice {
Name = "aaa",
UnitPrice = 150,
Quantity = 3
}
},
{
"bbb",
new BasketItemPrice {
Name = "bbb",
UnitPrice = 100,
Quantity = 2
}
}
};
var results = new BasketPricingResults()
{
Messages = new List <string>()
};
offer.ApplyOffers(basketItemsByName, results);
var discount = basketItemsByName["bbb"].Discount;
Assert.That(discount, Is.EqualTo(10));
}
public void ApplyOffers(IDictionary <string, BasketItemPrice> basketItemsByItemName, BasketPricingResults results)
{
if (!basketItemsByItemName.TryGetValue(basketItem, out var item))
{
return;
}
if (!item.UnitPrice.HasValue)
{
results.Messages.Add(string.Format(IBasketPricingOffer.Errors.CannotDiscountUnpricedItem, this.basketItem));
return;
}
var price = canBeCumulated ? item.Discount ?? item.UnitPrice : item.UnitPrice;
var discount = price * (decimal)(percentDiscount) * item.Quantity;
results.Messages.Add($"{basketItem} {percentDiscount:P2} off: -£{discount}");
item.Discount = discount;
}
public void ApplyOffers(IDictionary <string, BasketItemPrice> basketItemsByItemName, BasketPricingResults results)
{
var conditionalItemFound = basketItemsByItemName.TryGetValue(conditionalItem, out var basketItem) && basketItem.Quantity >= quantity;
if (!conditionalItemFound)
{
return;
}
var canApplyOffers = basketItemsByItemName.TryGetValue(offer, out var basketItemToDiscount);
if (!canApplyOffers)
{
return;
}
if (!basketItemToDiscount.UnitPrice.HasValue)
{
results.Messages.Add(string.Format(IBasketPricingOffer.Errors.CannotDiscountUnpricedItem));
return;
}
var itemsICanDiscount = basketItem.Quantity / quantity;
if (itemsICanDiscount >= basketItemToDiscount.Quantity)
{
// all
basketItemToDiscount.Discount = basketItemToDiscount.Quantity * basketItemToDiscount.UnitPrice.Value * discount;
results.Messages.Add($"All {offer} received {discount:P2} discount: -£{basketItemToDiscount.Discount}");
return;
}
// only a smaller number
basketItemToDiscount.Discount = itemsICanDiscount * basketItemToDiscount.UnitPrice * discount;
results.Messages.Add($"{itemsICanDiscount} {offer}s received {discount:P2} discount: -£{basketItemToDiscount.Discount}");
return;
}
