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    <p>I'm a big fan of unit testing, though my tests don't provide complete coverage nowadays... mostly because I'm working on a web site and much of my code just grabs data from the database, manipulates it, and spits it out. The manipulation code is generally well tested, but its a real pain to test the database code.</p> <p>That being said, I can point out a case where unit tests saved me weeks of work...</p> <p>I was working on a smallish project (4-6 devs) a while back and, after months of work we had reached a state of near completion. At this point, the folks in charge of the product decided that, instead of storing dates (and generating reports using them) in GMT, they wanted everything in EST. Given the product was built to handle large amounts of data/logs and generate information about that data based on timeframes, this was a fairly major change.</p> <p>Over the course of the next few days, the development team went in and changed everything to deal with EST timestamps. What would have taken us weeks to do had we not had such extensive automated tests, took us just 3 days, allowing us to meet an aggressive schedule. We were able to jump into the code and start changing whatever we needed to; the unit tests giving us courage by knowing the system would complain quickly if we broken something. To this day, I use that experience as an example of how you can never truly understand the benefits of automated testing until it saves you... and it certainly did that for my team.</p>
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