public void ValidTransaction_WhenWithdraw_ShouldReturnsSuccess()
{
SetupAtmWithEnoughtOfCash();
var transaction = GetValidTransaction();
transactionFactory.Setup(f => f.Create(It.IsAny <Account>(), It.IsAny <int>())).Returns(transaction);
var WithdrawIsSuccess = atm.DoWithdrawal(account, aWithdrawalAmount);
Assert.That(WithdrawIsSuccess, Is.True);
}