nextjs-testing

What problem does it solve?

This Skill helps developers quickly set up reliable tests for Next.js applications using Jest and React Testing Library, reducing debugging time and ensuring UI consistency.

Core Features & Use Cases

• Setup Jest & RTL: Install and configure Jest, React Testing Library, and Next.js integration for both server and client components.
• Mock Next.js Features: Provide practical patterns to mock router, image, and API routes in tests.
• Test Types & Scenarios: Create unit tests for components and utilities, integration tests for pages and API routes, and end-to-end-ish patterns for server components.
• Real-World Use Case: Example: add tests for a Next.js page that fetches data and renders loading states, error handling, and navigation.

Quick Start

Follow these steps to start testing a Next.js project:

• Install testing dependencies: npm install -D jest @testing-library/react @testing-library/jest-dom @testing-library/user-event @types/jest
• Create jest.config.ts integrating Next.js via next/jest
• Add a setup file (e.g., jest.setup.ts) with RTL matchers
• Example test import Page and verify a heading renders