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What is TDD?

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What is TDD?

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TDD is a telecommunication device for people with deafness that allows a person to transmit typed messages over the phone lines to another person with a TDD. Most TDDs include a keyboard for typing messages to send and a display and/or printer to receive messages.

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The steps of test first design (TFD) are overviewed in the UML activity diagram of Figure 1. The first step is to quickly add a test, basically just enough code to fail. Next you run your tests, often the complete test suite although for sake of speed you may decide to run only a subset, to ensure that the new test does in fact fail. You then update your functional code to make it pass the new tests. The fourth step is to run your tests again. If they fail you need to update your functional code and retest. Once the tests pass the next step is to start over (you may first need to refactor any duplication out of your design as needed, turning TFD into TDD). Figure 1. The Steps of test-first design (TFD). I like to describe TDD with this simple formula: TDD = Refactoring + TFD. TDD completely turns traditional development around. When you first go to implement a new feature, the first question that you ask is whether the existing design is the best design possible that enables you to imp

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