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From "Sebb (JIRA)" <>
Subject [jira] [Updated] (VALIDATOR-344) AbstractCheckDigit class does not fully test invalid strings
Date Sun, 04 Jan 2015 03:15:34 GMT


Sebb updated VALIDATOR-344:
    Affects Version/s: 1.4.0 Release

> AbstractCheckDigit class does not fully test invalid strings
> ------------------------------------------------------------
>                 Key: VALIDATOR-344
>                 URL:
>             Project: Commons Validator
>          Issue Type: Bug
>    Affects Versions: 1.4.0 Release
>            Reporter: Sebb
>             Fix For: 1.4.1
>         Attachments: Validator-344-1.patch
> The AbstractCheckDigit class does not fully test invalid check digits.
> There are several aspects to this:
> 1. the createInvalidCodes method only checks for invalid digits - it does not try alphabetics,
for example
> 2. the "invalid" String array entries are passed unchanged to both the calculate() method
- which expects a string without the check digit - and to the isValid() method, which expects
the string to contain the check digit. As a result, only strings which are syntactically invalid
will generate an Exception and thereby pass the test.
> 3. testMissingCode does not call isInvalid() with a string length of 1. I assume the
empty string should not have a check digit.
> Case 1) can be (partially) solved by including other printable characters in the generated
> Case 2) can (I think) be solved by assuming that the string always includes the check
character, and stripping this off before passing it to calculate(). If the method does not
throw an Exception, then the test must check that the calculated character does not agree.
It may not be possible to check all types of invalid input this way, but at least it should
be more robust than the current test case. Additional test cases can be added to separately
test calculate() and isValid() if it proves necessary.

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