public void OnSale_Should_Throw_ArgumentNullException_If_Products_Is_Null()
{
IQueryable <Product> products = null;
var ex = Assert.Throws <ArgumentNullException>(() => ProductExtensions.OnSale(products));
Assert.Equal(nameof(products), ex.ParamName);
}
public void OnSale_Should_Return_Only_Products_OnSale_On_The_Current_Date()
{
var p1 = Product.Create("ean", "sku", "name", "url");
var p2 = Product.Create("ean", "sku", "name", "url");
var p3 = Product.Create("ean", "sku", "name", "url");
p1.SetOnSale();
p2.SetOnSale(DateTime.Today.AddDays(-1), DateTime.Today.AddMonths(1));
IQueryable <Product> products = new Product[]
{
p1, p2, p3
}.AsQueryable();
var today = DateTime.Now;
var productsOnSale = ProductExtensions.OnSale(products).ToArray();
Assert.Equal(2, productsOnSale.Count());
Assert.True(productsOnSale.All(p => p.IsOnSale && p.OnSaleFrom <= today && (!p.OnSaleTo.HasValue || p.OnSaleTo >= today)));
}