public void NewDiscountPricingRule_For0DiscountPrice_ThrowsArgumentOutOfRangeException()
{
var units = 1;
var discountPrice = 0;
var regularPricingRule = new RegularPricingRule();
Assert.ThrowsException <ArgumentOutOfRangeException>(() =>
new DiscountPricingRule(units, discountPrice, regularPricingRule));
}
public void ApplyPrice_Calculates_Price()
{
var regularPricing = new RegularPricingRule();
var orderItem = new OrderItem
{
Product = new Product
{
UnitPrice = 10
},
Units = 2
};
var price = regularPricing.ApplyPrice(orderItem);
Assert.AreEqual(20, price);
}
public void Checkout()
{
var product1 = new Product
{
UnitPrice = 10,
PricingRules = new List <IPricingRule>
{
new RegularPricingRule()
}
};
var regPricingRule = new RegularPricingRule();
var product2 = new Product
{
UnitPrice = 20,
PricingRules = new List <IPricingRule>
{
regPricingRule,
new DiscountPricingRule(2, 35, regPricingRule)
}
};
var cartItems = new List <OrderItem>
{
new OrderItem
{
Product = product1,
Units = 2
},
new OrderItem
{
Product = product2,
Units = 3
}
};
var register = new BillingRegister();
var total = register.Checkout(cartItems);
Assert.AreEqual(75, total);
}
public void ApplyPrice_For()
{
// Init
var units = 3;
var discountPrice = 25;
var regularPricingRule = new RegularPricingRule();
var discountPricingRule = new DiscountPricingRule(units, discountPrice, regularPricingRule);
var orderItem = new OrderItem
{
Product = new Product
{
UnitPrice = 10
},
Units = 4
};
// Call
var price = discountPricingRule.ApplyPrice(orderItem);
// Assert
Assert.AreEqual(35, price);
}
public void ApplyPrice_ForNullOrderItem_Throws()
{
var regularPricing = new RegularPricingRule();
Assert.ThrowsException <ArgumentNullException>(() => regularPricing.ApplyPrice(null));
}