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POTesting with random inputs best practices
 

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    <p><strong>NOTE</strong>: I mention the next couple of paragraphs as background. If you just want a TL;DR, feel free to skip down to the numbered questions as they are only indirectly related to this info.</p> <p>I'm currently writing a python script that does some stuff with POSIX dates (among other things). Unit testing these seems a little bit difficult though, since there's such a wide range of dates and times that can be encountered.</p> <p>Of course, it's impractical for me to try to test every single date/time combination possible, so I think I'm going to try a unit test that randomizes the inputs and then reports what the inputs were if the test failed. Statisically speaking, I figure that I can achieve a bit more completeness of testing than I could if I tried to think of all potential problem areas (due to missing things) or testing all cases (due to sheer infeasability), assuming that I run it enough times.</p> <p>So here are a few questions (mainly indirectly related to the above ):</p> <ol> <li>What types of code are good candidates for randomized testing? What types of code aren't? <ul> <li>How do I go about determining the number of times to run the code with randomized inputs? I ask this because I want to have a large enough sample to determine any bugs, but don't want to wait a week to get my results.</li> <li>Are these kinds of tests well suited for unit tests, or is there another kind of test that it works well with?</li> <li>Are there any other best practices for doing this kind of thing?</li> </ul></li> </ol> <h3>Related topics:</h3> <ul> <li><a href="https://stackoverflow.com/questions/32458/random-data-in-unit-tests">Random data in unit tests?</a></li> </ul>
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