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Nextjs13.1 Testing Strategy

Testing Strategy ✅

A healthy Next.js project uses a testing pyramid: unit at the base, E2E at the top, and observability watching production.

Unit & Component Tests 🧪

  • Jest / Vitest: run logic tests quickly; prefer Vitest for faster TS + ESM support.
  • React Testing Library: test components via user interactions.
  • Mock server components by isolating client behavior or using wrappers that render server output to JSON fixtures.

Integration & E2E 🛣️

  • Playwright / Cypress: automate real browser flows.
    • Test auth (login/out), navigation, critical funnels.
    • Use Playwright fixtures to seed DB.
  • Visual Regression: Chromatic, Loki, or Percy to catch CSS drift.

API & Contract Testing 🔗

  • Supertest: hit route handlers or next start server endpoints directly.
  • Pact or OpenAPI schema validation: ensure BFF/clients agree on contracts.

Tips 🎯

  1. Mock external services (Stripe, SendGrid) with local simulators.
  2. Use testing env vars (.env.test).
  3. Run E2E per PR via preview deployments.

Analogy: testing is a safety net—unit tests are small mesh squares, integration tests are thicker ropes, and E2E harnesses catch you if everything else fails.

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12.1 Database & ORM Integration14.1 Observability