public void ReturnPriceLessPreferredCustomerDiscountGivenPreferredCustomerAndQuatityGreatherThanOne()
{
// Arrange
var units = 1;
var unitPrice = 2.5m;
customer = new Customer {
IsPreferred = true
};
// Act
var calculatedPrice = pricingCalculator.Calculate(units, customer, unitPrice);
// Assert
var expectedPrice = unitPrice * units * (1 - PricingCalculator.PreferredCustomerDiscount);
Assert.AreEqual(expectedPrice, calculatedPrice);
}
public void PricingCalculator_Calculate_Args_Null_Items()
{
// ARRANGE
var calculator = new PricingCalculator();
// ACT
Exception ex = Assert.Throws <ArgumentNullException>(
() => calculator.Calculate(null));
// ASSERT
Assert.Equal("Value cannot be null. (Parameter 'items')", ex.Message);
}
public void CalculatePricing_When_No_Promotions()
{
// ARRANGE
var cart = TestData.Cart1;
var calculator = new PricingCalculator();
// ACT
var result = calculator.Calculate(cart);
// ASSERT
Assert.Equal(24.77M, result.TotalPrice);
Assert.Equal(0M, result.TotalDiscount);
Assert.Equal(result.TotalPrice, result.TotalPriceToPay);
}
public void CalculatePricing_With_BuyALotGetADiscount_Promotion()
{
// ARRANGE
var cart = TestData.Cart1;
var calculator = new PricingCalculator();
// ACT
var result = calculator.Calculate(
cart,
new BuyALotGetADiscountPromotion(3, 2) // buy at least 3 items and get 2% of discount
);
// ASSERT
Assert.Equal(24.77M, result.TotalPrice);
Assert.Equal(0.4954M, result.TotalDiscount);
Assert.Equal(result.TotalPriceToPay, result.TotalPrice - result.TotalDiscount);
}
public void CalculatePricing_With_Buy3GetOneFree_Promotion()
{
// ARRANGE
var cart = TestData.Cart1;
var calculator = new PricingCalculator();
// ACT
var result = calculator.Calculate(
cart,
new BuyManyGetSomeFreePromotion(3, 1, "kg", new Guid(TestData.ApplesSku)) // get 1kg of apples free for each 3kg (buy 3 get 1 free)
);
// ASSERT
Assert.Equal(24.77M, result.TotalPrice);
Assert.Equal(1.55M, result.TotalDiscount);
Assert.Equal(result.TotalPriceToPay, result.TotalPrice - result.TotalDiscount);
}
public void CalculatePricing_With_Two_Promotions()
{
// ARRANGE
var cart = TestData.Cart1;
var calculator = new PricingCalculator();
// ACT
var result = calculator.Calculate(
cart,
new BuyManyGetSomeFreePromotion(3, 1, "kg", new Guid(TestData.ApplesSku)), // get 1kg of apples free for each 3kg (buy 3 get 1 free)
new BuyALotGetADiscountPromotion(3, 2) // buy at least 3 items and get 2% of discount
);
// ASSERT
Assert.Equal(24.77M, result.TotalPrice);
Assert.Equal(2.0454M, result.TotalDiscount);
Assert.Equal(result.TotalPriceToPay, result.TotalPrice - result.TotalDiscount);
}