Test First or Test Driven development is a valuable software engineering practice. It comprises of much more than this article could attempt to cover such as Acceptance Test Driven Development (ATDD) and Behaviour driven development (BDD). We will focus on a subset of TDD that encourages developer testing and aids tremendously in shipping software rather than traditionally having testing as a secondary phase or responsibility of a tester and promotes testing as a first class citizen in our everyday software development lifecycle (SDLC). How many times have you intended to write unit tests after a feature has been created and due to time constraints ended up leaving it and moving onto the next part of the application with an uncertain feeling that it would have been better to have them in place before adding more complex layers? Following a TDD approach eliminates this as the tests are the first thing to consider as part of an initial implementation.


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