public void Calculate_ShouldReturnDiscountResult_WithCorrectProductsAndModel()
{
// Arrange
IQuantityDiscountCalculator timespanDiscountCalculator = new QuantityDiscountCalculator();
List <Product> products = new List <Product>()
{
new Product()
{
Id = 1, Name = "Beans", PluralName = "Beans", Price = 0.65m
},
new Product()
{
Id = 2, Name = "Bread", PluralName = "Breads", Price = 0.8m
},
new Product()
{
Id = 3, Name = "Milk", PluralName = "Milk", Price = 1.3m
},
new Product()
{
Id = 4, Name = "Apple", PluralName = "Apples", Price = 1.0m
},
};
QuantityDiscount quantityDiscount = new QuantityDiscount()
{
Id = 1,
BuyingProduct = products[0],
Quantity = 2,
DiscountedProduct = products[1],
DiscountPercentage = 0.5f,
IsActive = true
};
IEnumerable <BasketItem> items = new List <BasketItem>()
{
new BasketItem()
{
Product = new BasketItemProduct()
{
Id = 1, Name = "Beans", PluralName = "Beans", Price = 0.65m
},
Quantity = 2
},
new BasketItem()
{
Product = new BasketItemProduct()
{
Id = 2, Name = "Bread", PluralName = "Breads", Price = 0.8m
},
Quantity = 1
},
};
// Act
DiscountResult discountResult = timespanDiscountCalculator.Calculate(items, quantityDiscount);
// Assert
Assert.Equal(0.5, discountResult.DiscountPercentage);
Assert.Equal(0.40m, discountResult.DiscountedPrice);
Assert.Equal("Breads", discountResult.ProductPluralName);
}
public void Calculate_ShouldThrowException_WithNullProducts()
{
// Arrange
IQuantityDiscountCalculator timespanDiscountCalculator = new QuantityDiscountCalculator();
// Act & Assert
Assert.Throws <ArgumentNullException>(() => timespanDiscountCalculator.Calculate(null, null));
}