Write tests first, watch them fail, then implement minimal code to pass. Follows the red-green-refactor cycle: write a failing test, verify it fails correctly, implement minimal code to pass, then refactor while keeping tests green Requires deleting any production code written before tests exist; no exceptions for "reference" or "adaptation" Emphasizes watching tests fail as proof they actually test the right thing; tests that pass immediately prove nothing Covers common rationalizations (testing after, manual verification, sunk cost) with concrete rebuttals and a verification checklist to confirm TDD was followed
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