Testing
Socket.io wraps raw WebSocket (and falls back to HTTP long-polling) with a structured event system: rooms, namespaces, acknowledgements, and automatic reconnection. Each of these abstractions adds testable behavior that raw WebSocket testing doesn't cover. This guide focuses on what makes Socket.io testing distinct from basic
Testing
Server-Sent Events (SSE) are the simplest way to push data from server to client: a persistent HTTP connection over which the server streams text events. No WebSocket handshake, no binary framing, no bidirectional complexity — just a long-lived HTTP response with a specific content type. That simplicity makes SSE
Testing
Testing real-time event-driven code is one of the more intellectually demanding corners of frontend and Node.js testing. The code is inherently asynchronous, order-dependent, and timing-sensitive. Standard expect(value).toBe(x) assertions are insufficient when the value hasn't arrived yet. This guide covers the
Supabase
Supabase Realtime is one of the harder parts of the Supabase stack to test well.
Testing
Liveblocks powers real-time collaboration features in products like Figma-style editors, multiplayer forms, live cursors, and shared document systems.
Testing
Socket.io is the de-facto standard for bidirectional real-time communication in Node.js applications.
Testing
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