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);
}
public void If_MultiPriceRule_A_3_130_And_MultiPriceRule_A_5_190_And_Scan_9A_Then_Price_is_370()
{
IPricingEngine pe = new PricingEngine(
new List<IPricingRule> {
new QuantityPricingRule("A", 50),
new QuantityPricingRule("A", 3, 130),
new QuantityPricingRule("A", 5, 190),
});
ICheckout co = new Checkout(pe);
for (int i = 0; i < 9; i++)
{
co.Scan("A");
}
decimal price = co.GetTotalPrice();
decimal expectedPrice = 370;
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_Undo_Scan_Minus_2A_Then_Exception_Is_Thrown()
{
// for undo scan, use positive value for count and set parameter undoScan to true
IPricingEngine pe = new PricingEngine(
new List<IPricingRule> {
new QuantityPricingRule("A", 1, 50),
new QuantityPricingRule("A", 2, 90),
});
ICheckout co = new Checkout(pe);
co.Scan("A", -2, true);
decimal price = co.GetTotalPrice();
decimal expectedPrice = 90;
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_Scan_AB_Then_Price_is_80()
{
IPricingEngine pe = new PricingEngine(
new List<IPricingRule> {
new QuantityPricingRule("A", 50),
new QuantityPricingRule("B", 30)
});
ICheckout co = new Checkout(pe);
co.Scan("A");
co.Scan("B");
decimal price = co.GetTotalPrice();
decimal expectedPrice = 80;
Assert.AreEqual(expectedPrice, price);
}
public void If_Scan_0A_Then_Exception_Is_Thrown()
{
IPricingEngine pe = new PricingEngine(
new List<IPricingRule> {
new QuantityPricingRule("A", 1, 50),
new QuantityPricingRule("A", 2, 90),
});
ICheckout co = new Checkout(pe);
co.Scan("A", 0);
decimal price = co.GetTotalPrice();
decimal expectedPrice = 90;
Assert.AreEqual(expectedPrice, price);
}
public void If_Scan_3A_At_a_Time_And_Then_Undo_Scan_2A_Then_Price_is_50()
{
IPricingEngine pe = new PricingEngine(
new List<IPricingRule> {
new QuantityPricingRule("A", 1, 50),
new QuantityPricingRule("A", 2, 90),
});
ICheckout co = new Checkout(pe);
co.Scan("A", 3);
co.Scan("A", 2, true);
decimal price = co.GetTotalPrice();
decimal expectedPrice = 50;
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_QuantityPricingRule_A_50_And_MultiPriceRule_A_3_130_And_Scan_AAA_Then_Price_is_130()
{
IPricingEngine pe = new PricingEngine(
new List<IPricingRule> {
new QuantityPricingRule("A", 3, 130),
new QuantityPricingRule("A", 50)
}
);
ICheckout co = new Checkout(pe);
co.Scan("A");
co.Scan("A");
co.Scan("A");
decimal price = co.GetTotalPrice();
decimal expectedPrice = 130;
Assert.AreEqual(expectedPrice, price);
}
public void If_QuantityDiscountPricingRule_A_5_4_And_A_3_2_And_Scan_5A_Then_Price_is_180()
{
IPricingEngine pe = new PricingEngine(
new List<IPricingRule> {
new QuantityDiscountPricingRule("A", 3, 2),
new QuantityPricingRule("A", 3, 130),
new QuantityPricingRule("A", 2, 90),
new QuantityPricingRule("A", 1, 50),
new QuantityDiscountPricingRule("A", 5, 4),
});
ICheckout co = new Checkout(pe);
for (int i = 0; i < 5; i++)
{
co.Scan("A");
}
decimal price = co.GetTotalPrice();
decimal expectedPrice = 180;
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);
}
public void If_PriceCombination_And_Scan_Random_9A7B_Then_Price_is_530()
{
IPricingEngine pe = new PricingEngine(
new List<IPricingRule> {
new QuantityPricingRule("A", 50),
new QuantityPricingRule("A", 3, 130),
new QuantityPricingRule("A", 5, 190),
new QuantityPricingRule("B", 30),
new QuantityPricingRule("B", 2, 45),
new QuantityPricingRule("B", 4, 85)
});
ICheckout co = new Checkout(pe);
for (int i = 0; i < 7; i++)
{
co.Scan("A");
co.Scan("B");
}
for (int i = 0; i < 2; i++)
{
co.Scan("A");
}
decimal price = co.GetTotalPrice();
decimal expectedPrice = 530;
Assert.AreEqual(expectedPrice, price);
}
