private static void runRandomManyTimesForAllLengths(BankrekeningNummerVerification verification, Action <BankrekeningNummerVerification, string> action)
 {
     for (int i = 0; i < 1000; i++)
     {
         for (int length = BankrekeningNummerVerification.MinBankrekeningNummerLength; length < BankrekeningNummerVerification.MaxBankrekeningNummerLength; length++)
         {
             string generatedBankrekeningNummer = verification.Random(length);
             action(verification, generatedBankrekeningNummer);
         }
     }
 }
        public void Random_invalidLength_TestMethod()
        {
            BankrekeningNummerVerification verification = new BankrekeningNummerVerification();

            verification.Random(100); // invalid length; should throw an exception
        }