public void If_PricingEngine_Has_No_PricingRules_Then_ItemTotalPrice_Is_0()
{
IPricingEngine pe = new PricingEngine();
decimal price = pe.GetItemTotalPrice("B", 3);
decimal expectedPrice = 0;
Assert.AreEqual(expectedPrice, price);
}
public void PricingEngine_Add_Generic_PricingRules()
{
IPricingEngine pe = new PricingEngine();
pe.AddPricingRule(new QuantityPricingRule("A", 50));
pe.AddPricingRule(new QuantityPricingRule("B", 30));
decimal price = pe.GetItemTotalPrice("B", 3);
decimal expectedPrice = 90;
Assert.AreEqual(expectedPrice, price);
}
public void PricingEngine_Instantiate_From_List()
{
IPricingEngine pe = new PricingEngine(
new List<IPricingRule> {
new QuantityPricingRule("A", 50),
new QuantityPricingRule("B", 30)
});
decimal price = pe.GetItemTotalPrice("A", 2);
decimal expectedPrice = 100;
Assert.AreEqual(expectedPrice, price);
}
public void PricingEngine_Add_Specific_PricingRules()
{
IPricingEngine pe = new PricingEngine();
pe.AddQuantityPricingRule(new QuantityPricingRule("A", 50));
pe.AddQuantityPricingRule(new QuantityPricingRule("A", 2, 80));
pe.AddQuantityDiscountPricingRule(new QuantityDiscountPricingRule("A", 3, 2));
decimal price = pe.GetItemTotalPrice("A", 3);
decimal expectedPrice = 80;
Assert.AreEqual(expectedPrice, price);
}
