public void ScanSeveralItems()
{
Checkout checkout = new Checkout();
checkout.Scan("ABCD");
Assert.That(checkout.GetBill(), Is.EqualTo(115));
}
public void ScanOneItem()
{
Checkout checkout = new Checkout();
checkout.Scan("A");
Assert.That(checkout.GetBill(), Is.EqualTo(50));
}