public void OrderTotalIsZero_IsReturned_WhenQuantityIsZero()
{
//Arrange
OrderFunctionality o8 = new OrderFunctionality();
OrderDetails od1 = new OrderDetails("REF-000-000-01", "REF-000-001", "P0001", 0);
o8.NewOrderDetails(od1);
Product product1 = new Product("1", "Test1", 0.01m);
o8.NewProduct(product1);
//Act
//Assert
Assert.AreEqual(o8.OrderTotal("REF-000-000-01", "1"), 0.00m);
}