public void Wplata_WplataDodatniejKwoty()
{
var bank = new KontoBankowe(500);
int wplac = bank.wplacPieniadze(100);
Assert.AreEqual(600, wplac);
}
public void Wplata_WplataUjemnejKwoty()
{
var bank = new KontoBankowe();
Assert.Throws <ArgumentOutOfRangeException>(() => bank.wplacPieniadze(-100));
}
