public void OfferPriceForQtyBasedOfferWhenQtyIsZeroTest()
{
const decimal price = 20m;
var offer = new QtyBasedOffer(0, 15m);
var offerPrice = offer.OfferPrice(1, price);
Assert.NotNull(offer);
Assert.That(price, Is.EqualTo(offerPrice));
}
public void OfferPriceForQtyBasedOfferTest()
{
const int qty = 3;
const decimal individualPrice = 130m;
const decimal offerPrice = 100m;
var offer = new QtyBasedOffer(qty, offerPrice);
var price = offer.OfferPrice(qty, individualPrice);
Assert.NotNull(offer);
Assert.That(offerPrice, Is.EqualTo(price));
}