context-engineering-intro/validation/example-validate.md

description
Comprehensive validation for this codebase

Validate Codebase

Example generated validation command for a React + FastAPI + PostgreSQL app

Phase 1: Linting

!cd frontend && npm run lint !cd backend && ruff check src/

Phase 2: Type Checking

!cd frontend && npx tsc --noEmit !cd backend && mypy src/

Phase 3: Style Checking

!cd frontend && npm run format:check !cd backend && black --check src/

Phase 4: Unit Testing

!cd frontend && npm test -- --coverage !cd backend && pytest tests/unit -v --cov=src

Phase 5: End-to-End Testing

Setup

!docker-compose up -d !timeout 60 bash -c 'until curl -f http://localhost:8000/health; do sleep 2; done'

Frontend E2E (Playwright)

!cd frontend && npx playwright test

Tests:

• User registration → email verification → login
• Create item → edit item → delete item
• Search and filter functionality
• Error handling and validation
• All main user workflows

Backend E2E (API + Database)

Test all API endpoints: !curl -X POST http://localhost:8000/api/auth/register -d '{"email":"test@test.com","password":"Test123!"}' !TOKEN=$(curl -X POST http://localhost:8000/api/auth/login -d '{"email":"test@test.com","password":"Test123!"}' | jq -r '.token') !curl http://localhost:8000/api/items -H "Authorization: Bearer $TOKEN" !curl -X POST http://localhost:8000/api/items -H "Authorization: Bearer $TOKEN" -d '{"name":"Test"}'

Verify database: !docker exec postgres psql -U user -d db -c "SELECT COUNT(*) FROM users;" !docker exec postgres psql -U user -d db -c "SELECT * FROM items WHERE name='Test';"

Test error handling: !curl -w "%{http_code}" http://localhost:8000/api/items/invalid-id # Should be 404 !curl -w "%{http_code}" http://localhost:8000/api/admin -H "Authorization: Bearer $TOKEN" # Should be 403

Cleanup

!docker-compose down -v

Summary

All validation passed! Ready for deployment.