Test-driven development

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  • is an approach that combines test-first development (TFD) and refactor code;
  • writes a test before it writes the code—the test in effect does double duty in that it both specifies and validates that piece of code;
  • can be used to specify detailed requirements on a just-in-time (JIT) basis throughout construction—writing the acceptance test is the documentation; a.k.a. acceptance test-driven development or behavior-driven development;
  • makes small changes to a product that do not change its semantics—in other words, refactor code is a clean-up activity that makes something better but does not add or subtract functionality;