Test Automation
Writing and Testing Custom Vite Plugins: Transforms, HMR, and Virtual Modules
Vite plugins extend the build pipeline with custom transforms, virtual modules, and build hooks.
JavaScript
Latest
Test Automation
Testing H3 and Nitro Server Routes: Event Handlers, Middleware, and Plugins
H3 is the HTTP framework that powers Nitro, which in turn powers Nuxt 3's server engine.
Test Automation
Testing Cloudflare Workers Locally with Miniflare and Wrangler
Cloudflare Workers run in V8 isolates, not Node.js. That difference means standard testing approaches break: node:fs, node:http, and most Node.js built-ins are unavailable. Miniflare solves this by implementing the Workers runtime APIs locally — KV, R2, D1, Durable Objects, Queues — so your tests run in an
Test Automation
Using Biome as an All-in-One Linter and Formatter in CI
Biome is a high-performance JavaScript and TypeScript toolchain that replaces ESLint, Prettier, and several other tools with a single binary.
Testing
Web Push Testing Guide: VAPID Keys, pywebpush, and Notification Payload Validation
Web Push is the only push notification system that works across all major browsers without a vendor-specific SDK on the sender side.
Database Testing
Sequelize Testing Guide: Models, Hooks, and In-Memory Testing
Sequelize has been a cornerstone of Node.js database development for over a decade.
Testing
Testing SendGrid Integration: Sandbox Mode, Webhook Testing, and Delivery Assertions
SendGrid powers email delivery for many production applications. Testing SendGrid integration involves mocking the API client for unit tests, using SendGrid's sandbox mode for integration tests, and testing Event Webhooks for delivery tracking. This guide covers all three layers with Node.js examples. Key Takeaways Enable sandbox mode
Testing
Testing Nodemailer Email Flows with Ethereal Fake SMTP in Node.js
Nodemailer is the most popular Node.js email library. Testing Nodemailer flows has two approaches: mock the transporter entirely (unit tests) or use Ethereal's fake SMTP server (integration tests). This guide covers both approaches, with Jest examples for testing email content, attachments, and error handling without sending real
Testing
React Native Accessibility Testing: axe-core, jest-axe, and Detox
React Native gives you one codebase that runs on iOS and Android, but accessibility is one area where the platforms diverge significantly.
Testing
Socket.io Testing: Unit Tests with Jest, Integration with Supertest
Socket.io is the de-facto standard for bidirectional real-time communication in Node.js applications.
Testing
WebRTC Testing Guide: Unit Tests, Integration with Playwright, and Media Quality
WebRTC applications are notoriously hard to test because they involve browser APIs, network negotiation, and real-time media. This guide covers mocking RTCPeerConnection in Jest, intercepting WebRTC in Playwright, measuring media quality with getStats(), and simulating adverse network conditions. WebRTC powers video calls, screen sharing, and peer-to-peer data
Testing
axe-core for Mobile: Integrating Accessibility Testing into Appium Suites
axe-core is the most widely deployed accessibility rules engine in the world, and it works inside Appium test suites — not just on the web. By injecting axe-core into WebView contexts within hybrid and cross-platform apps, you can run the same accessibility rules in your mobile CI pipeline