When sitting down to create an application, many developers start by writing the code. Test Driven Development emphasizes the opposite, stressing the need to prepare test scenarios or test cases before writing the code itself. This seemingly backwards approach has some benefits. First of all, it requires that the programmer be very clear about what tests the program should pass and what test it should fail, bringing such concerns to the forefront of the software design process. Furthermore, by meticulously detailing what tests a system should pass and fail we can use tools to automate most of our tests. An automated job is one that's always very, very easy to do. These automated tests are meant to be run every time there's a code change and are referred to as unit tests.
NUnit is a free, open-source tool for .NET that is developed as a framework which can help automate unit testing. (The same unit test framework was already available for Java and was named jUnit.) NUnit can be downloaded from NUnit site or the SourceForge NUnit page.
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