public void ChangeBalanceTest()
        {
            AAccount a      = AAccount.CreateAccount("PLN", 0);
            float    change = 1;

            a.ChangeBalance(change);

            float expectedValue = 1;

            Assert.AreEqual(expectedValue, a.GetBalance());
        }
 public float GetAccountBalance(AAccount a)
 {
     return(a.GetBalance());
 }