public void Transfer_ValidBalance_AddsToTransactions()
{
// ARRANGE
Random random = new();
var fromOpeningBalance = random.NextDouble() * 1000D;
var fromAccount = new BankAccount(fromOpeningBalance);
var toOpeningBalance = random.NextDouble() * 500D;
var toAccount = new BankAccount(toOpeningBalance);
var transferAmount = random.NextDouble() * 10D;
// ACT
BankTeller.Transfer(fromAccount, toAccount, transferAmount);
// ASSERT
Assert.That(fromAccount.Transactions.Count, Is.EqualTo(1));
Assert.That(fromAccount.Transactions.Contains(transferAmount * -1D));
Assert.That(fromAccount.Balance, Is.EqualTo(fromOpeningBalance - transferAmount));
Assert.That(toAccount.Transactions.Count, Is.EqualTo(1));
Assert.That(toAccount.Transactions.Contains(transferAmount));
Assert.That(toAccount.Balance, Is.EqualTo(toOpeningBalance + transferAmount));
}
public void Transfer_BalanceTooLow_ThrowsException()
{
Assert.Throws <ApplicationException>(() =>
{
var from = new BankAccount(1);
var to = new BankAccount(2);
BankTeller.Transfer(from, to, from.Balance() + 1D);
Assert.That(from.Transactions.Any(), Is.False);
Assert.That(to.Transactions.Any(), Is.False);
});
}
public void Transfer_NegativeAmount_ThrowsException()
{
Assert.Throws <ApplicationException>(() =>
{
var from = new BankAccount(1);
var to = new BankAccount(2);
BankTeller.Transfer(from, to, -1D);
Assert.That(from.Transactions.Any(), Is.False);
Assert.That(to.Transactions.Any(), Is.False);
});
}
