private void TestSingleRental(IBillable rental)
{
var invoice = new Invoice();
invoice.AddItem(rental);
Assert.AreEqual(1, invoice.ItemCount);
Assert.AreEqual(rental.UnitPrice * rental.Units, invoice.TotalPrice);
}
public double Charge(IBillable employee, int days)
{
int result = employee.Rate * days;
if (employee.HasSpecialSkill())
{
return(result * 1.05);
}
return(result);
}
/// <summary>
/// Adds a new item.
/// </summary>
/// <param name="item">The item to add.</param>
public void AddItem(IBillable item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
Items.Add(item);
SubTotalPrice += item.TotalPrice;
}
public void Remove(IBillable item)
{
this.items.Remove(item);
}
public void Add(IBillable item)
{
this.items.Add(item);
}
