public void RemoveAllChangeItem()
{
VendingMachine machine = new GreedyVendingMachine();
machine.Add
(
Change.TenPence(5),
Change.TwentyPence(1)
);
int preBalance = machine.Balance.TotalValue();
// Take out 20p and make sure the balance is right
machine.Remove(Change.TenPence(5));
Assert.AreEqual(machine.Balance.TotalValue(), preBalance - 50);
// There shouldn't be any 10p items in the machine
Assert.IsFalse(machine.Balance.Any(c => c.Denomination == 10));
}
public void RemoveChangeItem_DoesNotExist()
{
VendingMachine machine = new GreedyVendingMachine();
machine.Add
(
Change.TenPence(5),
Change.TwentyPence(1)
);
// Take out 5p. This isn't in the machine, so should fail
machine.Remove(Change.FivePence(1));
}
public void RemoveChangeItem()
{
VendingMachine machine = new GreedyVendingMachine();
machine.Add
(
Change.TenPence(5),
Change.TwentyPence(1)
);
int preBalance = machine.Balance.TotalValue();
// Take out 20p and make sure the balance is right
machine.Remove(Change.TenPence(2));
Assert.AreEqual(machine.Balance.TotalValue(), preBalance - 20);
}
public void RemoveChangeItem_TooManySpecified()
{
VendingMachine machine = new GreedyVendingMachine();
machine.Add
(
Change.TenPence(5),
Change.TwentyPence(1)
);
// Take out 6 x 10p. That's more than is in the machine, so should fail
machine.Remove(Change.TenPence(6));
}
public void RemoveChangeItem_Rollback()
{
VendingMachine machine = new GreedyVendingMachine();
machine.Add
(
Change.TenPence(5),
Change.TwentyPence(3),
Change.FiftyPence(1)
);
int preBalance = machine.Balance.TotalValue();
Change[] changeToRemove =
{
Change.FiftyPence(1),
Change.TwentyPence(4)
};
bool caughtException = false;
try
{
machine.Remove(changeToRemove);
}
catch(ArgumentException)
{
caughtException = true;
}
Assert.IsTrue(caughtException);
// The balance should be the same
Assert.AreEqual(preBalance, machine.Balance.TotalValue());
// And the coins should be the same
Assert.AreEqual(3, machine.Balance.Count());
Assert.IsTrue(machine.Balance.FirstOrDefault(c => c.Denomination == 10 && c.Quantity == 5) != null);
Assert.IsTrue(machine.Balance.FirstOrDefault(c => c.Denomination == 20 && c.Quantity == 3) != null);
Assert.IsTrue(machine.Balance.FirstOrDefault(c => c.Denomination == 50 && c.Quantity == 1) != null);
}
