# TDD Enforcement

Red-Green-Refactor TDD methodology with mandatory failing tests, minimal...

- Repository: https://github.com/a5c-ai/babysitter (1887 stars)
- Category: Testing
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add a5c-ai/babysitter --skill tdd-enforcement -g -a claude-code -y`
Codex: `npx skills add a5c-ai/babysitter --skill tdd-enforcement -g -a codex -y`
Cursor: `npx skills add a5c-ai/babysitter --skill tdd-enforcement -g -a cursor -y`
Gemini CLI: `npx skills add a5c-ai/babysitter --skill tdd-enforcement -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add a5c-ai/babysitter`

## Description

Red-Green-Refactor TDD methodology with mandatory failing tests, minimal implementation, quality refactoring, and 80% coverage gating.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

- Write tests that define expected behavior
- Tests MUST fail (exit code 1)
- Use CI=true or --run flag, never watch mode
- Apply timeout guards (60s) to prevent hanging
- Record exit code as evidence

### 2. GREEN Phase - Minimal Implementation
- Write the minimal code to make tests pass
- Do NOT add features not covered by tests
- Do NOT optimize prematurely
- Tests MUST pass (exit code 0)
- Record exit code as evidence

### 3. REFACTOR Phase - Quality Improvement
- Apply SOLID principles and clean code patterns
- Improve naming, reduce coupling
- Remove duplication
- Run tests after EACH refactoring step
- Tests MUST remain passing (exit code 0)

### 4. Coverage Gate
- Measure coverage: statements, branches, functions, lines
- Minimum 80% overall coverage required
- Iterate: write additional tests for gaps until threshold met
- Maximum 3 convergence iterations

## Rules

- Never skip the RED phase
- Never accept GREEN without exit code 0
- Never use watch mode in CI
- Always record evidence (exit codes, coverage numbers)
- Enforce 80% coverage threshold

## When to Use

- All code implementation tasks
- Feature development
- Bug fixes (write regression test first)

## Agents Used

- `tdd-guide` (primary consumer)
- `code-reviewer` (validates test quality)