public void Should_CalculateCorrectTotalPriceWithoutDiscounts_When_ItemsScannedIncrementally()
{
// Arrange
var priceSystemMock = new Mock <IDiscountCalculator>();
priceSystemMock.Setup(x => x.CalculateTotalDiscount(It.IsAny <IEnumerable <ProductItem> >()));
var checkout = new Checkout(priceSystemMock.Object);
var item1 = new ProductItem {
Id = 0, Price = 10
};
var item2 = new ProductItem {
Id = 1, Price = 20
};
// Act
// Assert
var runningTotalPrice = 0;
checkout.Scan(item1);
runningTotalPrice = checkout.CalculateTotalPrice();
Assert.AreEqual(10, runningTotalPrice);
checkout.Scan(item2);
runningTotalPrice = checkout.CalculateTotalPrice();
Assert.AreEqual(30, runningTotalPrice);
checkout.Scan(item1);
runningTotalPrice = checkout.CalculateTotalPrice();
Assert.AreEqual(40, runningTotalPrice);
checkout.Scan(item1);
runningTotalPrice = checkout.CalculateTotalPrice();
Assert.AreEqual(50, runningTotalPrice);
}
public void Should_CorrectlyCalculatePrice_When_ThereIsOneOfEachItem()
{
// Arrange
var priceSystemMock = new Mock <IDiscountCalculator>();
priceSystemMock.Setup(x => x.CalculateTotalDiscount(
It.IsAny <int>(), It.IsAny <int>()
)).Returns(0);
var checkout = new Checkout(priceSystemMock.Object);
var item1 = new ProductItem {
Id = 0, Price = 10
};
var item2 = new ProductItem {
Id = 1, Price = 20
};
var item3 = new ProductItem {
Id = 2, Price = 5
};
var items = new List <ProductItem> {
item1, item2, item3
};
checkout.ScanBasket(items);
// Act
var result = checkout.CalculateTotalPrice();
// Assert
Assert.AreEqual(35, result);
}
public void Should_ApplyDiscount_When_DiscountApplicable()
{
// Arrange
var priceSystemMock = new Mock <IDiscountCalculator>();
priceSystemMock.Setup(x => x.CalculateTotalDiscount(It.IsAny <IEnumerable <ProductItem> >()));
var checkout = new Checkout(priceSystemMock.Object);
var item = new ProductItem {
Id = 0, Price = 3
};
checkout.Scan(item);
checkout.Scan(item);
checkout.Scan(item);
// Act
checkout.CalculateTotalPrice();
// Assert
priceSystemMock.Verify(x => x.CalculateTotalDiscount(
It.Is <IEnumerable <ProductItem> >(items => items.All(checkout.BasketItems.Contains))),
Times.Once);
}
public void Should_CorrectlyCalculatePrice_When_DiscountIsApplied()
{
// Arrange
var priceSystemMock = new Mock <IDiscountCalculator>();
priceSystemMock.Setup(x => x.CalculateTotalDiscount(
It.IsAny <IEnumerable <ProductItem> >()
)).Returns(20);
var checkout = new Checkout(priceSystemMock.Object);
var item = new ProductItem {
Id = 0, Price = 10
};
checkout.Scan(item);
checkout.Scan(item);
checkout.Scan(item);
// Act
var result = checkout.CalculateTotalPrice();
// Assert
Assert.AreEqual(10, result);
}
public void GivenListOfItems_WhenListHasNoItem_ReturnsZeroTotalCost()
{
//arrange
List <item> listWithNoItems = new List <item>();
//act
var sut = new Checkout();
//Assert
Assert.Equal(0, sut.CalculateTotalPrice(listWithNoItems));
}
public void GivenListOfItems_WhenListIsNull_ThrowsArgumentException()
{
//arrange
List <item> listWithNoItems = null;
//act
var sut = new Checkout();
//Assert
Assert.Throws <ArgumentException>(() => { sut.CalculateTotalPrice(listWithNoItems); });
}
public void GivenListOfItems_WhenItemssAreValid_ReturnsTotalCost()
{
//arrange
var listOfItems = TestVariables.GetFakeListOfItems();
Decimal totalApplePriceInList = listOfItems.Where(x => x.ItemName.ToLower() == "apple").Sum(y => y.ItemPrice);
Decimal totalOrangePriceInList = listOfItems.Where(x => x.ItemName.ToLower() == "orange").Sum(y => y.ItemPrice);
var totalPriceInLIst = listOfItems.Sum(x => x.ItemPrice);
var sut = new Checkout();
//add
//act
var result = sut.CalculateTotalPrice(listOfItems);
//Assert
Assert.Equal((Decimal)totalPriceInLIst, (Decimal)result);
}
public void Should_ReturnPriceOf0_When_BasketIsEmpty()
{
// Arrange
var priceSystemMock = new Mock <IDiscountCalculator>();
priceSystemMock.Setup(x => x.CalculateTotalDiscount(
It.IsAny <int>(), It.IsAny <int>()
)).Returns(0);
var checkout = new Checkout(priceSystemMock.Object);
checkout.ScanBasket(new List <ProductItem>());
// Act
var result = checkout.CalculateTotalPrice();
// Assert
Assert.AreEqual(0, result);
}