public void Available_Should_Throw_ArgumentNullException_If_Products_Is_Null()
{
IQueryable <Product> products = null;
var ex = Assert.Throws <ArgumentNullException>(() => ProductExtensions.Available(products));
Assert.Equal(nameof(products), ex.ParamName);
}
public void Available_Should_Return_Only_Products_On_Sale_And_With_Units_In_Stock()
{
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();
p1.SetUnitInStock(1);
p2.SetOnSale(DateTime.Today.AddDays(-1), DateTime.Today.AddMonths(1));
p2.SetUnitInStock(2);
IQueryable <Product> products = new Product[]
{
p1, p2, p3
}.AsQueryable();
var today = DateTime.Now;
var productsAvailable = ProductExtensions.Available(products).ToArray();
Assert.True(productsAvailable.All(p => p.IsOnSale && p.OnSaleFrom <= today && (!p.OnSaleTo.HasValue || p.OnSaleTo >= today) && p.UnitInStock > 0));
}