public void WithUnitInStock_Should_Throw_ArgumentNullException_If_Products_Is_Null()
{
IQueryable <Product> products = null;
int unitInStock = 0;
var ex = Assert.Throws <ArgumentNullException>(() => ProductExtensions.WithUnitInStock(products, unitInStock));
Assert.Equal(nameof(products), ex.ParamName);
}
public void WithUnitInStock_Should_Throw_ArgumentException_If_UnitInStock_Is_Less_Than_Zero()
{
IQueryable <Product> products = new Product[0].AsQueryable();
int unitInStock = -1;
var ex = Assert.Throws <ArgumentException>(() => ProductExtensions.WithUnitInStock(products, unitInStock));
Assert.Equal(nameof(unitInStock), ex.ParamName);
}
public void WithUnitInStock_Should_Return_Only_Products_With_Units_In_Stock_Greater_Than_The_Specified_Quantity()
{
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.SetUnitInStock(2);
p2.SetUnitInStock(3);
p3.SetUnitInStock(1);
IQueryable <Product> products = new Product[]
{
p1, p2, p3
}.AsQueryable();
int unitInStock = 1;
var productsWithUnitInStock = ProductExtensions.WithUnitInStock(products, unitInStock).ToArray();
Assert.True(productsWithUnitInStock.All(p => p.UnitInStock > unitInStock));
}
