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POTDD : Any pattern for constant testing?
 

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    <p>Constants are beautiful people - they can hold in a unique place a value that is used everywhere in your code. Changing that value requires only one simple modification.</p> <p>Life is cool.</p> <p>Well, this is the promise. Reality is sometime different :</p> <ul> <li>You change the <code>LogCompleteFileName</code> constant value from <code>L:\LOGS\MyApp.log</code> to <code>\\Traces\App208.txt</code> and you get two files : <code>\\traces\App208.txt</code> for the traces and <code>\\traces\App208.txt.log</code> for the logs...</li> <li>You change <code>TransactionTimeout</code> from 2 to 4 minutes and you still get a timeout after 2 minutes (after spending the day, you find out that you also have to change the timeout of the DBMS and the timeout of the transaction manager...).</li> <li>You replace <code>SleepTimeInMinutes</code> from <code>1</code> to <code>10</code> and you see no change (after an hour or so, you find out that the constant's name was misleading : the granularity is not the minute but the millisecond...).</li> <li>Even more subtle: you change <code>CompanyName</code> from, say <code>Yahoo</code> to <code>Microsoft</code> but automated mail alerts are still sent to <code>alert@yahoo.com</code>...</li> </ul> <p>Creating a constant is a contract. You are telling your readers that whenever they change the value, it will still works the way they think it should be.</p> <p>Nothing less. </p> <p>Of course, you need to test that you are not misleading your readers. You have to make sure that the implied contract is right.</p> <p>How do you achieve that with TDD? I'm just stuck with that. The only way I can test a change for a constant (!) value is to make that constant an application setting... Should I have to conclude that the <code>const</code> keyword should be avoided when I think that the value can and will change?</p> <p>How are you testing your (so called) constants using TDD?</p> <p>Many thanks in advance :)</p>
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