public void sale_with_2_momogi_and_pepsi_should_be_totaled_6000()
{
var sale = new Sale();
sale.AddLineItem(momogi, 2);
sale.AddLineItem(pepsi);
Assert.AreEqual(6000m, sale.GetTotal());
}
public void add_sli_with_same_product_will_change_quantity()
{
var sale = new Sale();
sale.AddLineItem(momogi, 2);
Assert.AreEqual(1, sale.LineItems.Count);
sale.AddLineItem(momogi);
Assert.AreEqual(1, sale.LineItems.Count);
var sli = sale.GetLineItem(momogi);
Assert.AreEqual(3, sli.Quantity);
}
/// <summary>
/// Mutates the sale with 'Buy N Get One' type discounts and gets the total.
/// </summary>
/// <param name="sale"></param>
/// <returns></returns>
public decimal GetTotal(Sale sale)
{
var discountedLineItems = new List <SalesLineItem>();
var originalLineItems = new List <SalesLineItem>();
foreach (var lineItem in sale.LineItems)
{
// Apply discounts directly to line item, if any.
foreach (
var discount in
_discounts
.Where(d => d.IsValid() && d.DiscountAppliedOnNextProduct)
.Where(d => d.ProductId == lineItem.ProductId && lineItem.Quantity > d.ThresholdQuantity)
.OrderByDescending(d => d.ThresholdQuantity))
{
// There may be eligible discount(s) to apply to current line item based on quantity.
// Apply the discounts with the largest quantities first as they generally have the better discounts.
while (lineItem.Quantity > discount.ThresholdQuantity)
{
// Create a separate line item that receives the discount.
var discountedLineItem =
new SalesLineItem(new Product(lineItem.ProductId, lineItem.ProductPrice), 1);
discountedLineItem.SetDiscount(discount.Discount);
// Save to temporary list.
discountedLineItems.Add(discountedLineItem);
// Decrement original line item quantity by the threshold quantity plus the promotional item.
lineItem.AddQuantity(-1 * (discount.ThresholdQuantity + 1));
// Create a new line item with the original threshold quantity to a temporary list.
// Do not want to count these quantities again.
var originalLineItem = new SalesLineItem(new Product(lineItem.ProductId, lineItem.ProductPrice),
discount.ThresholdQuantity);
originalLineItems.Add(originalLineItem);
// TODO: Add a limit, i.e. only get the discount a certain number of times.
}
}
}
sale.RemoveZeroQuantityLineItems();
foreach (var item in originalLineItems)
{
sale.MakeLineItem(new Product(item.ProductId, item.ProductPrice), item.Quantity);
}
foreach (var item in discountedLineItems)
{
sale.AddLineItem(item); // Add these directly to the sale.
}
var total = sale.LineItems.Sum(i => i.GetSubtotal());
return(total);
}
public void sale_total_with_changing_product_price_should_remain_consistent()
{
var sale = new Sale();
sale.AddLineItem(momogi);
Assert.AreEqual(500m, sale.GetTotal());
momogi.UnitPrice = 0;
Assert.AreEqual(500m, sale.GetTotal());
}
public void MakeLineItemIdenticalProductUpdatesQuantityByMultiples()
{
var sale = new Sale(SetupFileManagerWithNoPromotions().Object);
sale.AddLineItem(new SalesLineItem(new Product("Oranges", 0.2m)));
// Act
sale.MakeLineItem(new Product("Oranges", 0.2m), quantity: 2); // add same line item
Assert.That(sale.LineItems.Count, Is.EqualTo(1),
"Adding identical line item should update the quantity of the existing line item.");
Assert.That(sale.LineItems[0].Quantity, Is.EqualTo(3));
}
/// <summary>
/// Mutates the sale with quantity type discounts and gets the total.
/// </summary>
/// <param name="sale"></param>
/// <returns></returns>
public decimal GetTotal(Sale sale)
{
var discountedLineItems = new List <SalesLineItem>();
foreach (var lineItem in sale.LineItems)
{
// Apply discounts directly to line item, if any.
foreach (
var discount in
_discounts
.Where(d => d.IsValid() && !d.DiscountAppliedOnNextProduct)
.Where(d => d.ProductId == lineItem.ProductId && lineItem.Quantity >= d.ThresholdQuantity)
.OrderByDescending(d => d.ThresholdQuantity))
{
// There may be eligible discount(s) to apply to current line item based on quantity.
// Apply the discounts with the largest quantities first as they generally have the better discounts.
while (lineItem.Quantity >= discount.ThresholdQuantity)
{
// Create new line item with the quantity that gets the discount.
var discountedLineItem =
new SalesLineItem(new Product(lineItem.ProductId, lineItem.ProductPrice), discount.ThresholdQuantity);
discountedLineItem.SetDiscount(discount.Discount);
// Store in temporary list.
discountedLineItems.Add(discountedLineItem);
// Decrement the threshold quantity from the original line item.
lineItem.AddQuantity(-1 * discount.ThresholdQuantity);
// TODO: Add a limit, i.e. only get the discount a certain number of times.
}
}
}
sale.RemoveZeroQuantityLineItems();
// Add newly created line items that have the discount directly to the sale.
foreach (var item in discountedLineItems)
{
sale.AddLineItem(item);
}
var total = sale.LineItems.Sum(i => i.GetSubtotal());
return(total);
}
public void sale_with_2_pepsi_should_be_totaled_10000()
{
var sale = new Sale();
sale.AddLineItem(pepsi, 2);
Assert.AreEqual(10000m, sale.GetTotal());
}
