Test Driven Development

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This could also be a modification of an existing test. This is a differentiating feature of test-driven development versus writing unit tests after the ode is written: it makes the developer focus on the requirements before writing the code, a subtle but important difference. . Run all tests and see if the new one fails This validates that the test harness is working correctly and that the new test does not mistakenly pass without requiring any new code. This step also tests the test itself, in the negative: it rules out the possibility that the new test always passes, and therefore is worthless. The new test should also fail for the expected reason. This increases confidence (though does not guarantee) that it is testing the right thing, and passes only in intended cases. . Write some code The next step is to write some code that causes the test to pass. The new code written at this stage is not perfect, and may, for example, pass the test in an inelegant way. That is acceptable because later steps improve and hone it. At this point, the only purpose of the written code is to pass the test; no further (and therefore untested) functionality should be predicted nor ‘allowed for’ at any stage. 4. Run tests

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