React
React Testing Best Practices: Unit, Integration, and E2E Testing Guide
Test React apps with Vitest for unit tests, Testing Library for integration tests, and Playwright for E2E tests. This guide covers the testing pyramid for React applications.
Testing ensures your React app works correctly and doesn't regress.
Unit Tests with Vitest
Test individual functions and hooks in isolation.
Integration Tests with Testing Library
Test components as users interact with them — click buttons, fill forms, verify output.
E2E Tests with Playwright
Test complete user flows in a real browser across multiple pages.
Testing Pyramid
- ●Many unit tests (fast, isolated)
- ●Some integration tests (realistic)
- ●Few E2E tests (comprehensive but slow)
Coverage
Aim for 80% coverage on critical business logic.
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Written by M Daniyal Amjad Ali
Full Stack Software Engineer with 5+ years of experience. Expert in Next.js, React, Node.js, and Prisma. 100+ projects delivered worldwide.