Function createTestServer

src/__tests__/ws-framing.test.ts:47–75

* Spin up an HTTP server that upgrades to WebSocket via upgradeToWebSocket(). * Returns the server, its port, and a promise that resolves to the * server-side WebSocketConnection once a client connects.

()

 * server-side WebSocketConnection once a client connects.
 */
function createTestServer(): {
  server: http.Server;
  port: () => number;
  wsPromise: Promise<WebSocketConnection>;
} {
  let resolveWs: (ws: WebSocketConnection) => void;
  const wsPromise = new Promise<WebSocketConnection>((resolve) => {
    resolveWs = resolve;
  });

  const server = http.createServer();
  // Suppress ECONNRESET on any server connection during teardown
  server.on("connection", (socket) => {
    socket.on("error", () => {});
  });
  server.on("upgrade", (req, socket) => {
    socket.on("error", () => {});
    const ws = upgradeToWebSocket(req, socket as net.Socket);
    resolveWs(ws);
  });

  server.listen(0); // random available port

  return {
    server,
    port: () => (server.address() as net.AddressInfo).port,
    wsPromise,
  };
}

/**
 * Open a raw TCP connection to the test server and send an HTTP upgrade