Testing WebSocket Applications

import { Server, WebSocket as MockWS } from "mock-socket";
const URL = "ws://localhost:9999/ws";
const server = new Server(URL);
globalThis.WebSocket = MockWS;
server.on("connection", (s) => s.on("message", (m) => s.send(`echo:${m}`)));

const server = new Server(URL);
const client = createClient(URL);
await waitFor(() => client.state === "open");
server.close();
await waitFor(() => client.reconnectAttempts > 0);

import ws from "k6/ws";
export const options = { vus: 1000, duration: "5m" };
export default function () {
  ws.connect("wss://api.example.com/ws", (socket) => {
    socket.on("open", () => socket.send(JSON.stringify({ "type":"ping" })));
    socket.setTimeout(() => socket.close(), 30000);
  });
}