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POHow you test your applications for reliability under badly behaving i/o
 

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    <p><strike>Almost</strike> every application out there performs i/o operations, either with disk or over network.</p> <p>As my applications work fine under the development-time environment, I want to be sure they will still do when the Internet connection is slow or unstable, or when the user attempts to read data from badly-written CD.</p> <p>What tools would you recommend to simulate:</p> <ul> <li>slow i/o (opening files, <em>closing</em> files, reading and writing, enumeration of directory items)</li> <li>occasional i/o errors</li> <li>occasional 'access denied' responses</li> <li>packet loss in tcp/ip</li> <li>etc...</li> </ul> <hr> <p>EDIT:</p> <p>Windows:<br> The closest solution to do the job as described seems to be holodeck, commercial software (>$900).</p> <p>Linux:<br> Open solution wasn't found by now, but the same effect can be achived as specified by smcameron and krosenvold.</p> <hr> <p>Decorator pattern is a good idea. It would require to wrap my i/o classes, but resulting in a testing framework. The only remaining untested code would be in 3rd party libraries.</p> <p>Yet I decided not to go this way, but leave my code as it is and simulate i/o errors from outside.</p> <hr> <p>I now know that what I need is called 'fault injection'. I thought it was a common production-line part with plenty of solutions I just didn't know. (By the way, another similar good idea is 'fuzz testing', thanks to Lennart)</p> <p>On my mind, the problem is still not worth $900. I'm going to implement my own open-source tool based on hooks (targeting win32). I'll update this post when I'm done with it. Come back in 3 or 4 weeks or so...</p>
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