public void Get_Discount_Price_Handles_Different_Rules_For_Same_Unit_When_Sufficient_Quantity_In_Basket()
{
var itemA = new StockKeepingUnit("A", 50);
var itemB = new StockKeepingUnit("B", 30);
// two A and one B for 70
DiscountRule rule1 = new DiscountRuleBuilder().WithUnits(itemA, 2).WithUnits(itemB, 1).WithPrice(70).Build();
// two A for 75
DiscountRule rule2 = new DiscountRuleBuilder().WithUnits(itemA, 2).WithPrice(75).Build();
_mockRuleRepository.MockRules = new List <DiscountRule> {
rule1, rule2
};
List <ItemPile> basket = new List <ItemPile>
{
new ItemPile(itemA, 4),
new ItemPile(itemB, 2)
};
//both rules should be applied
decimal result = _pricing.GetDiscountedPrice(basket);
result.Should().Be(175);
}
public void Get_Discount_Price_Chooses_The_Best_Discount_For_Basket()
{
var itemA = new StockKeepingUnit("A", 50);
var itemB = new StockKeepingUnit("B", 30);
// two A for 75
DiscountRule rule1 = new DiscountRuleBuilder().WithUnits(itemA, 2).WithPrice(75).Build();
// two A and one B for 70
DiscountRule rule2 = new DiscountRuleBuilder().WithUnits(itemA, 2).WithUnits(itemB, 1).WithPrice(100).Build();
_mockRuleRepository.MockRules = new List <DiscountRule> {
rule1, rule2
};
List <ItemPile> basket = new List <ItemPile>
{
new ItemPile(itemA, 2),
new ItemPile(itemB, 1)
};
//the rule which renders the smallest price is rule2
decimal result = _pricing.GetDiscountedPrice(basket);
result.Should().Be(175);
}
public void Get_Discount_Price_Applies_Discount_Rule()
{
var itemA = new StockKeepingUnit("A", 50);
var itemB = new StockKeepingUnit("B", 30);
DiscountRule rule = new DiscountRuleBuilder().WithUnits(itemA, 2).WithUnits(itemB, 1).WithPrice(70).Build();
_mockRuleRepository.MockRules = new List <DiscountRule> {
rule
};
List <ItemPile> basket = new List <ItemPile>();
basket.Add(new ItemPile(itemA, 2));
basket.Add(new ItemPile(itemB, 1));
decimal result = _pricing.GetDiscountedPrice(basket);
result.Should().Be(70);
}
public void Get_Discount_Price_Ignores_Rules_For_Units_Not_In_Basket()
{
var itemA = new StockKeepingUnit("A", 50);
var itemB = new StockKeepingUnit("B", 30);
var itemC = new StockKeepingUnit("C", 30);
DiscountRule rule1 = new DiscountRuleBuilder().WithUnits(itemA, 2).WithUnits(itemB, 1).WithPrice(70).Build();
DiscountRule rule2 = new DiscountRuleBuilder().WithUnits(itemC, 2).WithPrice(50).Build();
_mockRuleRepository.MockRules = new List <DiscountRule> {
rule1, rule2
};
List <ItemPile> basket = new List <ItemPile>
{
new ItemPile(itemA, 3),
new ItemPile(itemB, 2)
};
decimal result = _pricing.GetDiscountedPrice(basket);
result.Should().Be(150);
}
public void Get_Discount_Price_Does_Not_Change_Input_Basket_Instance()
{
var itemA = new StockKeepingUnit("A", 50);
var itemB = new StockKeepingUnit("B", 30);
DiscountRule rule = new DiscountRuleBuilder().WithUnits(itemA, 2).WithUnits(itemB, 1).WithPrice(70).Build();
_mockRuleRepository.MockRules = new List <DiscountRule> {
rule
};
List <ItemPile> basket = new List <ItemPile>();
basket.Add(new ItemPile(itemA, 3));
basket.Add(new ItemPile(itemB, 2));
decimal result = _pricing.GetDiscountedPrice(basket);
result.Should().Be(150);
basket.Count().Should().Be(2);
basket[0].Quantity.Should().Be(3);
basket[1].Quantity.Should().Be(2);
}
