| name | test-driven-development |
| version | 0.3.1 |
| description | Use PROACTIVELY when enforcing TDD red-green-refactor, setting up test infrastructure, configuring coverage gates, or implementing the Testing Trophy model. Installs git hooks, npm scripts, and CLAUDE.md configuration to enforce test-first development. Supports coverage thresholds and test distribution analysis. Not for prototypes or projects without test requirements. |
Test-Driven Development
Overview
This skill enforces test-driven development (TDD) workflows when using Claude Code. Once installed, Claude will automatically follow red-green-refactor patterns without manual prompting.
Version: 0.3.0
Status: Stable
What This Skill Does
Automatic TDD Enforcement - When you ask Claude to implement a feature:
- RED Phase: Write failing test FIRST
- GREEN Phase: Implement minimal code to pass test
- REFACTOR Phase: Improve code quality while keeping tests green
No manual prompting required - configured through CLAUDE.md.
When to Use This Skill
Use when:
- Enforcing TDD red-green-refactor workflow
- Setting up test infrastructure for new projects
- Configuring coverage gates and thresholds
- Implementing Testing Trophy model (70/20/10 distribution)
- Ensuring consistent test quality in LLM-generated code
Don't use if:
- Project doesn't need tests
- Working on prototypes or experiments
- Existing test workflow is incompatible
Trigger Phrases
- "Set up TDD" / "Enforce TDD workflow"
- "Configure test-first development"
- "Set up coverage gates"
- "Implement Testing Trophy model"
- "Install test enforcement"
Testing Trophy Model
From Kent C. Dodds: "Write tests. Not too many. Mostly integration."
| Type | Emphasis | Purpose |
|---|
| Integration | Majority | Test user workflows and component interactions |
| Unit | Smaller | Test complex isolated business logic |
| E2E | Minimal | Test critical user journeys only |
| Static | Base | TypeScript, ESLint (catches errors before runtime) |
Coverage Gates
Default thresholds (configurable):
| Metric | Threshold |
|---|
| Line coverage | 80% |
| Branch coverage | 75% |
| Function coverage | 90% |
Installation Summary
The skill will:
- Detect test framework (Vitest, Jest, Mocha, AVA)
- Configure CLAUDE.md with TDD workflow requirements
- Install npm scripts (
test:tdd, test:red, test:green, validate:tdd)
- Add git pre-commit hook for test validation
- Create helper scripts for maintenance
See workflow/installation-steps.md for detailed procedures.
Success Criteria
- CLAUDE.md contains TDD configuration
- npm scripts added to package.json
- Git pre-commit hook installed
- Coverage thresholds configured
- Validation passes:
npm run validate:tdd
Safety Features
- Non-destructive: Automatic backups before modifications
- Merge-safe: Preserves existing CLAUDE.md content
- Reversible: Rollback utility included
- Idempotent: Skips if already installed
See reference/technical-details.md for full documentation.
Quick Troubleshooting
| Issue | Solution |
|---|
| LLM not following TDD | Run npm run validate:tdd |
| Git hook blocking commits | Ensure tests exist, or git commit --no-verify |
| Want to remove | Run node .tdd-automation/scripts/rollback-tdd.js |
Additional Resources
- Detailed workflow:
workflow/installation-steps.md
- Technical reference:
reference/technical-details.md
- Full documentation:
README.md
Version History
- 0.3.0 - Renamed to test-driven-development, added Testing Trophy and coverage gates
- 0.2.0 - Stable release (as tdd-automation)
- 0.1.0 - Initial proof-of-concept
