public void ApplyDiscountCard_WithDefaultDiscountCard_CorrectTotalValue(int productsCount, decimal expectedResult)
{
var terminal = new PointOfSaleTerminal(
new ProductsPriceSetBuilder()
.AddProduct(DefaultProductCode.ToString(), 100.0M, 3, 200.0M)
.GetAllProducts());
var discountCard = CreateDefaultDiscountCard();
ScanStringAsChars(terminal, new string(DefaultProductCode, productsCount));
AssertDecimalEquals(expectedResult, terminal.CalculateTotal(discountCard));
}
public void ScanProductsSequence_WithDefaultPricesSet_CorrectTotalValue(string productCodes, decimal expectedResult)
{
var terminal = new PointOfSaleTerminal(
new ProductsPriceSetBuilder()
.AddProduct("A", 1.25M, 3, 3.0M)
.AddProduct("B", 4.25M)
.AddProduct("C", 1.0M, 6, 5.0M)
.AddProduct("D", 0.75M)
.GetAllProducts());
ScanStringAsChars(terminal, productCodes);
AssertDecimalEquals(expectedResult, terminal.CalculateTotal());
}
public void DiscountRateChanges_WithDefaultDiscountCard_CorrectTotalValue(int productsCount, decimal expectedResult)
{
var discountCard = CreateDefaultDiscountCard();
Func<int, decimal> scanItems = count =>
{
var terminal = new PointOfSaleTerminal(
new ProductsPriceSetBuilder()
.AddProduct(DefaultProductCode.ToString(), 100.0M)
.GetAllProducts());
ScanStringAsChars(terminal, new string(DefaultProductCode, count));
return terminal.CalculateTotal(discountCard);
};
scanItems(productsCount);
decimal actualResult = scanItems(1);
AssertDecimalEquals(expectedResult, actualResult);
}
public void ScanNonExistingProduct_WithEmptyPricesSet_ExceptionThrown()
{
var terminal = new PointOfSaleTerminal(new PointOfSaleProduct[0]);
Assert.Throws(typeof(ArgumentException), () => terminal.Scan("A"));
}
private void ScanStringAsChars(PointOfSaleTerminal terminal, string productCodes)
{
foreach(char ch in productCodes)
{
terminal.Scan(ch.ToString());
}
}