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tdd

AI DevKit · Test-driven development — write a failing test before writing production code. Use when implementing new functionality, adding behavior, or fixing bugs during active development.

skills/tdd/SKILL.md

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# TDD

Red. Green. Refactor. In that order, every time.

## Hard Rules

- No production code without a failing test first.
- If production code was written before its test, delete it and start over with a failing test.
- Never skip the red step. A test that has never failed proves nothing.

## Cycle

For each unit of behavior: