public void Calculate_ShouldThrowException_WithNullProducts()
{
// Arrange
IDateTimeUtil dateTimeUtil = new DateTimeUtil();
ITimespanDiscountCalculator timespanDiscountCalculator = new TimespanDiscountCalculator(dateTimeUtil);
// Act & Assert
Assert.Throws <ArgumentNullException>(() => timespanDiscountCalculator.Calculate(null, null));
}
public void Calculate_ShouldReturnDiscountResult_WithCorrectProductsAndModel()
{
// Arrange
Mock <IDateTimeUtil> mockDateTimeUtil = new Mock <IDateTimeUtil>();
mockDateTimeUtil.Setup(x => x.Now()).Returns(new DateTime(2020, 10, 15));
ITimespanDiscountCalculator timespanDiscountCalculator = new TimespanDiscountCalculator(mockDateTimeUtil.Object);
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
},
};
TimespanDiscount timespanDiscount = new TimespanDiscount()
{
Id = 1,
BuyingProduct = products[3],
From = new DateTime(2020, 10, 10),
To = new DateTime(2020, 10, 20),
DiscountedProduct = products[3],
DiscountPercentage = 0.1f,
IsActive = true
};
IEnumerable <BasketItem> items = new List <BasketItem>()
{
new BasketItem()
{
Product = new BasketItemProduct()
{
Id = 4, Name = "Apple", PluralName = "Apples", Price = 1.0m
},
Quantity = 1
},
};
// Act
DiscountResult discountResult = timespanDiscountCalculator.Calculate(items, timespanDiscount);
// Assert
Assert.Equal(0.1f, discountResult.DiscountPercentage);
Assert.Equal(0.10m, discountResult.DiscountedPrice);
Assert.Equal("Apples", discountResult.ProductPluralName);
}
