public static List <Product> OrderByPopularity(this List <Product> products, List <ShopperOrder> orders)
{
var calculator = new ProductPopularityCalculator();
var soldAmountLookup = calculator.CalculatePopularityBySoldAmount(orders);
products.Sort(new SortByAmountSoldDescending(soldAmountLookup));
return(products);
}
public void Test_SortByPopularity()
{
var orders = new List <ShopperOrder>
{
new ShopperOrder
{
Products = new List <Product>
{
new Product {
Name = "Product A", Quantity = 3
},
new Product {
Name = "Product B", Quantity = 4
}
}
},
new ShopperOrder
{
Products = new List <Product>
{
new Product {
Name = "Product A", Quantity = 3
},
new Product {
Name = "Product C", Quantity = 10
}
}
}
};
var calculator = new ProductPopularityCalculator();
var soldAmountLookup = calculator.CalculatePopularityBySoldAmount(orders);
var products = new List <Product>
{
new Product {
Name = "Product A"
},
new Product {
Name = "Product B"
},
new Product {
Name = "Product C"
}
};
products.Sort(new SortByAmountSoldDescending(soldAmountLookup));
Assert.Equal("Product C", products[0].Name);
Assert.Equal("Product A", products[1].Name);
Assert.Equal("Product B", products[2].Name);
}
public void CalculatePopularityBySoldAmount_Test()
{
var orders = new List <ShopperOrder>
{
new ShopperOrder
{
Products = new List <Product>
{
new Product {
Name = "Product A", Quantity = 3
},
new Product {
Name = "Product B", Quantity = 4
}
}
},
new ShopperOrder
{
Products = new List <Product>
{
new Product {
Name = "Product A", Quantity = 3
},
new Product {
Name = "Product C", Quantity = 10
}
}
}
};
var calculator = new ProductPopularityCalculator();
var result = calculator.CalculatePopularityBySoldAmount(orders);
Assert.Equal(6, result["Product A"]);
Assert.Equal(4, result["Product B"]);
Assert.Equal(10, result["Product C"]);
}