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From "Sebb (JIRA)" <>
Subject [jira] [Created] (VALIDATOR-344) AbstractCheckDigit class does not fully test invalid strings
Date Tue, 18 Nov 2014 17:41:34 GMT
Sebb created VALIDATOR-344:

             Summary: AbstractCheckDigit class does not fully test invalid strings
                 Key: VALIDATOR-344
             Project: Commons Validator
          Issue Type: Bug
            Reporter: Sebb

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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