Create test users with JWT tokens, connect Socket.io clients in tests, emit events (join, message:send, typing) and assert received events (message:received, typing:update) using done callbacks. Test authentication failures, message persistence, and edge cases. Use mongodb-memory-server for isolated test database.
Backend: Message and Conversation models, Socket.io server with JWT auth, room management, event handlers (message, typing, read, presence), REST API for history and chat list, offline email notifications. Frontend: ChatPage, ChatList, ChatWindow, MessageBubble, MessageInput, TypingIndicator, Socket.io client, infinite scroll, auto-scroll, browser push. Security: JWT auth, CORS, authorization checks, input validation, rate limiting.
Backend: models/Message.js, models/Conversation.js, routes/chat.js (REST), config/socketEvents.js (Socket.io handlers), config/socket.js (server init). Frontend: components/Chat/ (ChatPage, ChatList, ChatWindow, MessageBubble, MessageInput, TypingIndicator), utils/socket.js (client connection).
Deterministic room IDs ([userId1, userId2].sort().join('_')), acknowledgment callbacks for confirmed delivery, typing indicators with 3-second timeout, online users Map for presence, message persistence before broadcast, cleanup of Socket.io listeners in React useEffect, and offline email notifications with rate limiting.
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