Testing
Socket.io wraps WebSocket with rooms, namespaces, auto-reconnect, and a binary protocol — all of which require specific testing approaches. The good news: socket.io-client works perfectly in Node.js tests, so you can test the full stack without a browser. This tutorial walks from unit-level handler tests
Contract Testing
This tutorial walks through implementing Pact contract testing in a Node.js microservice architecture. You'll write consumer tests that generate pact files, verify them on the provider side, and publish to a Pact Broker for CI/CD integration. Setup Install Pact for Node.js: npm install --save-dev
Integration Testing
Node.js integration tests that mock PostgreSQL and Redis test your assumptions, not your code. testcontainers starts real database containers during your Jest run and tears them down after. Your tests talk to the actual services — no mocks, no drift, no surprises. Key Takeaways testcontainers/node works with Jest, Vitest,
Testing
Your Node.js API handles 10 concurrent users without breaking a sweat. Your staging environment runs clean. Then you ship, traffic picks up, and at 300 simultaneous users the response times double, the queue backs up, and your database starts dropping connections. Nobody saw it coming because nobody tested it
Testing
Fastify is one of the fastest Node.js web frameworks, and it has excellent built-in testing support through fastify.inject(). Most Fastify teams never get past console.log debugging. Here's how to build a proper Fastify test suite. Fastify's Testing Advantage Fastify was designed to
Testing
Express.js is the most widely used Node.js web framework. It's also the most widely under-tested. The flexibility that makes Express great — you can do anything — also means there's no built-in testing story. This guide covers the complete Express testing stack: unit tests