Despite all the hype surrounding unit testing and Test Driven Development (TDD) many developers don't see them as useful processes that are applicable to the production of real-world applications. One reason is that once you get down to the intricacies of application development, all of the easy testing you've heard so much about can vanish. You may find yourself writing unit tests that are hard to implement against real code. This is often the case in database testing, where TDD can quickly lose its appeal, and force you to revert your processes to the previous real-world methodologies your team employed.
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