public void Constructor_Empty()
{
var iban = new Iban();
Assert.IsNull(iban.Country);
Assert.IsNotNullOrEmpty(iban.NationalCheckDigits);
Assert.AreEqual(NationalCheckDigits, iban.NationalCheckDigits);
Assert.IsNull(iban.Bban);
Assert.IsNullOrEmpty(iban.Value());
Assert.IsNotNullOrEmpty(iban.ToString());
}