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A professional React and Next.js application needs thorough testing and a reliable deployment pipeline. This lesson covers Jest, React Testing Library, testing components, hooks, and pages, end-to-end testing with Playwright, deploying to Vercel and self-hosted environments, and managing environment variables.
| Tool | Purpose |
|---|---|
| Jest | Test runner and assertion library |
| React Testing Library | Testing React components from the user's perspective |
| Playwright | End-to-end browser testing |
| MSW (Mock Service Worker) | Mocking API requests |
npm install -D jest @jest/globals ts-jest @testing-library/react @testing-library/jest-dom @testing-library/user-event jest-environment-jsdom
// jest.config.ts
import type { Config } from "jest";
import nextJest from "next/jest";
const createJestConfig = nextJest({ dir: "./" });
const config: Config = {
testEnvironment: "jsdom",
setupFilesAfterSetup: ["<rootDir>/jest.setup.ts"],
moduleNameMapper: {
"^@/(.*)$": "<rootDir>/src/$1",
},
};
export default createJestConfig(config);
// jest.setup.ts
import "@testing-library/jest-dom";
React Testing Library encourages testing from the user's perspective — find elements by their role, label, or text, not by CSS class or test ID:
// Button.tsx
interface ButtonProps {
onClick: () => void;
children: React.ReactNode;
disabled?: boolean;
}
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