test-driven-development

Drives implementation test-first through red-green-refactor cycles: one failing test, the minimal code to pass it, then cleanup under green. Use before writing production code for a new behavior, and whenever the request mentions TDD, test-driven, test-first, red-green-refactor, "write the test first", "start with a failing test", or reproducing a bug with a test before fixing it. Also use when implementation keeps…