public void RulesApplicationGeneratesNonStrictlyMonotonicDescendingPriceTrend(PromotionRuleType type)
{
var testContext = new TestContext();
IPromotionRule rule = new PromotionRuleFactory(testContext).Create(type);
ICart cart = new CartFactory(testContext).Create(type);
decimal originalPrice = cart.Total;
ICart newCart = rule.Evaluate(cart);
decimal newPrice = newCart.Total;
Assert.True(newPrice <= originalPrice);
}
public void RulesApplicationGeneratesNonStrictlyMonotonicDescendingQuantityTrend(PromotionRuleType type)
{
var testContext = new TestContext();
IPromotionRule rule = new PromotionRuleFactory(testContext).Create(type);
ICart cart = new CartFactory(testContext).Create(type);
int originalQuantity = cart.Quantity;
ICart newCart = rule.Evaluate(cart);
int newQuantity = newCart.Quantity;
Assert.True(newQuantity <= originalQuantity);
}
public void RulesApplicationChangesNothingWhenAllEntriesAreAlreadyMarkedAsHandled(PromotionRuleType type)
{
var testContext = new TestContext();
IPromotionRule rule = new PromotionRuleFactory(testContext).Create(type);
ICart cart = new CartFactory(testContext).Create(type);
var invariantPromotionRule = new InvariantPromotionRule(testContext.CartFactory);
ICart cartWithNoPromotableItems = invariantPromotionRule.Evaluate(cart);
decimal originalPrice = cartWithNoPromotableItems.Total;
int originalQuantity = cartWithNoPromotableItems.Quantity;
int originalCount = cartWithNoPromotableItems.Count;
ICart newCart = rule.Evaluate(cartWithNoPromotableItems);
decimal newPrice = newCart.Total;
int newQuantity = newCart.Quantity;
int newCount = newCart.Count;
Assert.Equal(originalPrice, newPrice);
Assert.Equal(originalQuantity, newQuantity);
Assert.Equal(originalCount, newCount);
}