public void Successor_ValidInput_ReturnsCorrectPostalCode(string postalCode, string postalCodeSuccessor)
{
var code = new BOPostalCode(postalCode);
var codeSuccessor = new BOPostalCode(postalCodeSuccessor);
Assert.AreEqual(codeSuccessor, code.Successor);
Assert.AreEqual(codeSuccessor.ToString(), code.Successor.ToString());
Assert.AreEqual(codeSuccessor.ToHumanReadableString(), code.Successor.ToHumanReadableString());
}
