public void TransferAmountFromPayerToPayee()
{
var payer = new BankAccount(accountNumber: "1", amount: 1.0);
var payee = new BankAccount(accountNumber: "2", amount: 0.0);
var sut = new BankTransfer(payer, payee, amount: 1.0);
sut.Execute();
Assert.That(payer.GetAmount(), Is.EqualTo(0.0), "amount");
Assert.That(payee.GetAmount(), Is.EqualTo(1.0), "amount");
}
