public void Total_AfterIncrement_ReturnsUnitPrice()
{
var saleItem = new SaleItem(new Product("A", 1));
saleItem.Increment();
Assert.Equal(2, saleItem.GetPrice().Total);
}
public void Total_WithVolumeDiscount_ReturnsVolumePrice()
{
var saleItem = new SaleItem(new Product("A", 1, new VolumeDiscount(2, 3)));
saleItem.Increment();
saleItem.Increment();
Assert.Equal(2, saleItem.GetPrice().Total);
}
public void Total_SingleItem_ReturnsUnitPrice()
{
var saleItem = new SaleItem(new Product("A", 1));
Assert.Equal(1, saleItem.GetPrice().Total);
}