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    <p>TDD can be a whole lot more than Unit Testing - so I'd say that Unit Testing is just a part of TDD. The methodology as a whole I think can include creating tests (expressing expectation/requirement of correct behaviour) on the result of any process in the software development. Be that writing code, build scripts, deployment scripts, database scripts, data import/export/transformation... whatever you need to do you should ask yourself, "How can I prove this has worked? Can I automate a test for that?"</p> <p>As an example: something that is often overlooked because it falls out of scope of Unit Testing but is a very valid test, and one that is important to front-load in the development process is deployment. </p> <p>If a software development cannot be easily deployed to the production environment without significant effort and change (to the software or environment architecture) it is important to know this up front, rather than a week before it has to go live. Once you have that process nailed, wouldn't it be nice to have a way of testing to make sure that it was correctly deployed?</p> <p>When you understand that process - why not script and automate it? If you know the requirement is that it must be deployed, why not write a test for that before even doing it?</p> <p>I've said it before but I'll say it again - the best resource I've found on the subject is <strong>Growing Object-Oriented Software, Guided by Tests</strong> - which is part of the Kent Beck Signature Series.</p>
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    1. POIs test driven development a form of unit testing
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    1. COThanks Matt, I'll have a look at the book. I have not yet been doing TDD in my project, but along the line, I have written unit test in a traditional way that check all possible path of a method to be sure that any further change does not cause regression.
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