public void TestAChoosingShortestLine()
{
var c1 = new Cashier(1);
c1.EnqueueCustomer(new CustomerA(1, 10));
c1.EnqueueCustomer(new CustomerB(2, 100));
c1.EnqueueCustomer(new CustomerA(3, 8));
var c2 = new Cashier(2);
c2.EnqueueCustomer(new CustomerB(2, 10));
c2.EnqueueCustomer(new CustomerB(2, 15));
var c3 = new CashierTrainee(3);
c3.EnqueueCustomer(new CustomerA(1, 9999));
var cashiers = new HashSet<ICashier> {c1, c2, c3};
var c = new CustomerA(3, 1);
var chosenCashier = c.ChooseCashier(cashiers);
Assert.AreEqual(c3, chosenCashier);
}
public void TestNullCashiers()
{
var noCashiers = new HashSet<ICashier>();
var custA = new CustomerA(1, 10);
var chosenA = custA.ChooseCashier(noCashiers);
Assert.IsNull(chosenA);
var custB = new CustomerA(1, 10);
var chosenB = custB.ChooseCashier(noCashiers);
Assert.IsNull(chosenB);
}