public async Task <BankTransaction> ProcessPayment(Payment payment)
{
var status = _random.Next(100) <= 50 ? BankTransactionStatus.Success : BankTransactionStatus.Failed;
var transactionId = new BankTransactionId(Guid.NewGuid());
var result = BankTransaction.Create(transactionId, status, payment.Id);
// Simulate http latency
await Task.Delay(TimeSpan.FromSeconds(_random.Next(3)));
return(result);
}
public void Should_throw_when_payment_is_null()
{
// Arrange
var transactionId = new BankTransactionId(Guid.NewGuid());
var transaction = BankTransaction.Create(transactionId, BankTransactionStatus.Failed, _payment.Id);
// Act
Action action = () => _service.UpdatePayment(null, transaction);
// Assert
action.Should().Throw<ArgumentNullException>();
}
public void Should_reject_payment_when_transaction_status_is_failed()
{
// Arrange
var transactionId = new BankTransactionId(Guid.NewGuid());
var transaction = BankTransaction.Create(transactionId, BankTransactionStatus.Failed, _payment.Id);
// Act
_service.UpdatePayment(_payment, transaction);
// Assert
_payment.Status.Should().Be(PaymentStatus.Rejected);
}
public void Should_approve_payment_when_transaction_status_is_success()
{
// Arrange
var transactionId = new BankTransactionId(Guid.NewGuid());
var transaction = BankTransaction.Create(transactionId, BankTransactionStatus.Success, _payment.Id);
// Act
_service.UpdatePayment(_payment, transaction);
// Assert
_payment.Status.Should().Be(PaymentStatus.Approved);
}
public void Should_throw_when_bank_transaction_status_is_unknown()
{
// Arrange
var transactionId = new BankTransactionId(Guid.NewGuid());
var transaction = BankTransaction.Create(transactionId, BankTransactionStatus.Failed, _payment.Id);
ReflectionHelper.UpdatePrivateProperty(transaction, nameof(transaction.Status), 1337);
// Act
Action action = () => _service.UpdatePayment(_payment, transaction);
// Assert
action.Should().Throw<UnknownBankStatusException>();
}
public void Should_raise_an_error_when_payment_id_is_null()
{
Action action = () => BankTransaction.Create(_transactionId, BankTransactionStatus.Success, null);
action.Should().Throw <ValidationException>();
}
public void Should_raise_an_error_when_status_has_incorrect_value()
{
Action action = () => BankTransaction.Create(_transactionId, (BankTransactionStatus)1337, _paymentId);
action.Should().Throw <ValidationException>();
}