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🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!)

🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!) Congratulations, developer! 👏 You’ve successfully completed the 45-Day React.js Roadmap — from understanding the fundamentals to mastering advanced concepts like Redux, Routing, Testing, and Deployment. 📘 What You’ve Learned ✅ React basics — Components, JSX, Props, and State ✅ Hooks — useState, useEffect, useRef, useMemo, and Custom Hooks ✅ Context API and Redux Toolkit for global state management ✅ Routing with React Router & Protected Routes ✅ Data fetching using Fetch API, Axios, React Query ✅ Advanced Patterns — Compound Components, Render Props, HOCs ✅ Styling — CSS Modules, Styled Components, Theming ✅ Animations, Accessibility, Testing, and Performance Optimization ✅ Deployment on Vercel, Netlify, or GitHub Pages 🧩 Final Project Ideas Now that you’re done, build real-world apps to polish your skills: 📝 Task ...
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📘 Day 27 — Integration Testing & Mocking Fetch

📘 Day 27 — Integration Testing & Mocking Fetch

Integration tests verify that multiple components and functions work together. Mock Service Worker (msw) allows you to mock APIs for testing without real network calls.

🔹 Setting up MSW

npm install msw --save-dev

🔸 Example Handler

import { rest } from "msw";

export const handlers = [
  rest.get("/api/users", (req, res, ctx) => {
    return res(ctx.json([{ id: 1, name: "Rahul" }]));
  }),
];

💡 Try It Yourself

MSW intercepts network calls and simulates responses, making integration tests faster and reliable.

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