public void InsufficientFunds()
{
IVendingMachine machine = GetVendingMachineInstance();
machine.InsertCoin(new Quarter());
machine.Messages.Clear();
machine.SelectProduct(Constants.CHIPS);
Assert.AreEqual("PRICE $0.50", machine.Messages.Dequeue());
Assert.AreEqual("$0.25", machine.Messages.Dequeue());
}
public void MakeChange()
{
IVendingMachine machine = GetVendingMachineInstance();
CreateAvailableChange(machine);
machine.InsertCoin(new Quarter());
machine.InsertCoin(new Quarter());
machine.InsertCoin(new Quarter());
machine.SelectProduct(Constants.CANDY);
Assert.AreEqual(10, machine.CoinReturn.Sum(coin => coin.CentValue));
}
public void GetChips_ExactChange()
{
IVendingMachine machine = GetVendingMachineInstance();
machine.InsertCoin(new Quarter());
machine.InsertCoin(new Quarter());
string productName = Constants.CHIPS;
IProduct product = machine.SelectProduct(productName);
Assert.AreEqual(productName, product?.Name);
Assert.AreEqual(0, machine.CoinReturn.Count);
}
public void Messages_ThankYouAfterPurchase()
{
IVendingMachine machine = GetVendingMachineInstance();
machine.InsertCoin(new Quarter());
machine.InsertCoin(new Quarter());
machine.Messages.Clear();
machine.SelectProduct(Constants.CHIPS);
Assert.AreEqual("THANK YOU", machine.Messages.Dequeue());
Assert.AreEqual("EXACT CHANGE ONLY", machine.Messages.Dequeue());
}
private void BuyChips(IVendingMachine machine, int quantity, bool discardMessages = true)
{
for (int i = 0; i < quantity; i++)
{
machine.InsertCoin(new Quarter());
machine.InsertCoin(new Quarter());
machine.SelectProduct(Constants.CHIPS);
}
if (discardMessages)
{
machine.Messages.Clear();
}
}
private void CreateAvailableChange(IVendingMachine machine)
{
machine.InsertCoin(new Dime());
machine.InsertCoin(new Dime());
machine.InsertCoin(new Nickel());
machine.InsertCoin(new Nickel());
machine.InsertCoin(new Nickel());
machine.InsertCoin(new Nickel());
machine.InsertCoin(new Nickel());
machine.InsertCoin(new Nickel());
string productName = Constants.CHIPS;
IProduct product = machine.SelectProduct(productName);
}
public void Messages_SoldOut()
{
IVendingMachine machine = GetVendingMachineInstance();
BuyChips(machine, 10);
machine.InsertCoin(new Quarter());
machine.InsertCoin(new Quarter());
machine.Messages.Clear();
machine.SelectProduct(Constants.CHIPS);
Assert.AreEqual("SOLD OUT", machine.Messages.Dequeue());
Assert.AreEqual("$0.50", machine.Messages.Dequeue());
}
public void GetChips_InexactChange_SuperfluousCoin()
{
IVendingMachine machine = GetVendingMachineInstance();
machine.InsertCoin(new Quarter());
machine.InsertCoin(new Quarter());
machine.InsertCoin(new Nickel());
string productName = Constants.CHIPS;
IProduct product = machine.SelectProduct(productName);
Assert.AreEqual(productName, product?.Name);
Assert.AreEqual(1, machine.CoinReturn.Count);
Assert.AreEqual(5, machine.CoinReturn[0].CentValue);
}
public void Messages_RequireExactChange_AfterPurchase()
{
IVendingMachine machine = GetVendingMachineInstance();
machine.InsertCoin(new Quarter());
machine.InsertCoin(new Quarter());
string productName = Constants.CHIPS;
machine.Messages.Clear();
machine.SelectProduct(productName);
// Clear the thank you message
machine.Messages.Dequeue();
Assert.AreEqual("EXACT CHANGE ONLY", machine.Messages.Dequeue());
}
public void Messages_InsertCoin_AfterPurchase()
{
IVendingMachine machine = GetVendingMachineInstance();
machine.InsertCoin(new Dime());
machine.InsertCoin(new Dime());
machine.InsertCoin(new Dime());
machine.InsertCoin(new Dime());
machine.InsertCoin(new Nickel());
machine.InsertCoin(new Nickel());
machine.Messages.Clear();
machine.SelectProduct(Constants.CHIPS);
Assert.AreEqual("THANK YOU", machine.Messages.Dequeue());
Assert.AreEqual("INSERT COIN", machine.Messages.Dequeue());
}
private void SelectProduct()
{
WriteLine();
WriteLine("(a) Cola, $1.00");
WriteLine("(b) Chips, $0.50");
WriteLine("(c) Candy, $0.65");
WriteLine("(x) Go Back");
WriteLine();
var selection = ReadLine();
if (selection?.ToLowerInvariant() == "x")
{
return;
}
_vendingMachine.SelectProduct(selection ?? string.Empty);
CheckDisplay();
}
/// <summary>
/// <inheritdoc/>
/// </summary>
/// <param name="itemName">Name of the product selected by the user</param>
public void SelectProduct(string itemName)
{
_vendingMachine.SelectProduct(itemName);
}
