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);
}
public void If_MultiPriceRule_B_2_45_And_MultiPriceRule_A_3_130_And_Scan_AAABBD_Then_Price_is_190()
{
IPricingEngine pe = new PricingEngine();
pe.AddQuantityPricingRule(new QuantityPricingRule("A", 50));
pe.AddQuantityPricingRule(new QuantityPricingRule("B", 30));
pe.AddQuantityPricingRule(new QuantityPricingRule("D", 15));
pe.AddQuantityPricingRule(new QuantityPricingRule("A", 3, 130));
pe.AddQuantityPricingRule(new QuantityPricingRule("B", 2, 45));
ICheckout co = new Checkout(pe);
co.Scan("A");
co.Scan("A");
co.Scan("A");
co.Scan("B");
co.Scan("B");
co.Scan("D");
decimal price = co.GetTotalPrice();
decimal expectedPrice = 190;
Assert.AreEqual(expectedPrice, price);
}
public void If_QuantityPricingRule_A_50_And_Scan_AA_Then_Price_is_100()
{
IPricingEngine pe = new PricingEngine();
pe.AddQuantityPricingRule(new QuantityPricingRule("A", 50));
pe.AddQuantityPricingRule(new QuantityPricingRule("B", 30));
ICheckout co = new Checkout(pe);
co.Scan("A");
co.Scan("A");
decimal price = co.GetTotalPrice();
decimal expectedPrice = 100;
Assert.AreEqual(expectedPrice, price);
}
public void If_Scan_CDBA_Then_Price_is_115()
{
IPricingEngine pe = new PricingEngine();
pe.AddQuantityPricingRule(new QuantityPricingRule("A", 50));
pe.AddQuantityPricingRule(new QuantityPricingRule("B", 30));
pe.AddQuantityPricingRule(new QuantityPricingRule("C", 20));
pe.AddQuantityPricingRule(new QuantityPricingRule("D", 15));
ICheckout co = new Checkout(pe);
co.Scan("C");
co.Scan("D");
co.Scan("B");
co.Scan("A");
decimal price = co.GetTotalPrice();
decimal expectedPrice = 115;
Assert.AreEqual(expectedPrice, price);
}
public void If_QuantityDiscountPricingRule_A_3_2_And_Scan_3A_Then_Price_is_90()
{
IPricingEngine pe = new PricingEngine();
pe.AddQuantityDiscountPricingRule(new QuantityDiscountPricingRule("A", 3, 2));
pe.AddQuantityPricingRule(new QuantityPricingRule("A", 3, 130));
pe.AddQuantityPricingRule(new QuantityPricingRule("A", 2, 90));
pe.AddQuantityPricingRule(new QuantityPricingRule("A", 1, 50));
ICheckout co = new Checkout(pe);
for (int i = 0; i < 3; i++)
{
co.Scan("A");
}
decimal price = co.GetTotalPrice();
decimal expectedPrice = 90;
Assert.AreEqual(expectedPrice, price);
}