public void TestIfItCanPayBill()
{
// Se inicializan los mocks
var utilitesAccount = Substitute.For<Account>();
var payerAccount = Substitute.For<Account>();
payerAccount.Balance.Returns(20);
utilitesAccount.Balance.Returns(0);
// Se inicializa el objeto a probar
var target = new UtilitiesPaymentProcessor(utilitesAccount);
string billCode = "bill";
decimal debt = 10;
decimal leftOver = 1;
IDictionary<string, decimal> bills = GetBills(target);
bills.Add(billCode, debt);
// Se ejercita el código bajo prueba
decimal actualLeftOver = target.PayBill(billCode, payerAccount, debt - leftOver);
// Verificar que el método haya funcionado correctamente
// Prueba de Caja negra
Assert.That(bills[billCode], Is.EqualTo(actualLeftOver));
// Prueba de Caja blanca o transparente
// Se especifica que se debe transferir fondos del deudor al acreedor.
payerAccount.Received().TransferFunds(utilitesAccount, debt - leftOver);
utilitesAccount.DidNotReceive().TransferFunds(Arg.Any<Account>(), Arg.Any<decimal>());
}
private static IDictionary<string, decimal> GetBills(UtilitiesPaymentProcessor target)
{
var fieldInfo = typeof(UtilitiesPaymentProcessor)
.GetField("bills", BindingFlags.NonPublic | BindingFlags.Instance);
var bills = (IDictionary<string, decimal>)fieldInfo.GetValue(target);
return bills;
}
public void TestIfItCanGetTheBalance()
{
// Arrange
var target = new UtilitiesPaymentProcessor(null);
string billCode = "bill";
decimal expectedBalance = 10;
// Act
target.AddBill(billCode, expectedBalance);
decimal actualBalance = target.GetBalance(billCode);
// Assert
Assert.That(actualBalance, Is.EqualTo(expectedBalance));
}
public void TestIfItCanAddBill()
{
// Se inicializan los objetos a utilizar
var utilitesAccount = new Account();
var target = new UtilitiesPaymentProcessor(utilitesAccount);
string billCode = "bill";
int debt = 1;
// Se ejercita el código bajo prueba
target.AddBill(billCode, debt);
// Se obtienen las facturas del objeto
IDictionary<string, decimal> bills = GetBills(target);
// Se verifica que efectivamente se haya agregado la factura
Assert.That(bills.Keys, Contains.Item(billCode));
Assert.That(bills[billCode], Is.EqualTo(debt));
}
public void TestAnAccountCanPayABillThroughPaymentProcessor()
{
// Arrange
string billCode = "bill";
int initialPayerBalance = 100;
int initialDebt = 50;
int payment = 40;
int expectedDebtBalance = initialDebt - payment;
int expectedPayerBalance = initialPayerBalance - payment;
var utilitiesAccount = new Account();
var payerAccount = new Account();
payerAccount.Deposit(initialPayerBalance);
var processor = new UtilitiesPaymentProcessor(utilitiesAccount);
// Act
processor.AddBill(billCode, initialDebt);
decimal debtBalance = processor.PayBill(billCode, payerAccount, payment);
// Assert
Assert.That(debtBalance, Is.EqualTo(expectedDebtBalance));
Assert.That(utilitiesAccount.Balance, Is.EqualTo(payment));
Assert.That(payerAccount.Balance, Is.EqualTo(expectedPayerBalance));
}
