socket.io/test/support/server.js

// this is a test server to support tests which make requests

var express = require('express');
var app = express();
var join = require('path').join;
var http = require('http').Server(app);
var server = require('engine.io').attach(http);
http.listen(process.env.ZUUL_PORT);

// serve `engine.io.js` and `worker.js` for worker tests
app.use('/test/support', express.static(join(__dirname, 'public')));

server.on('connection', function(socket){
  socket.send('hi');

  // Bounce any received messages back
  socket.on('message', function (data) {
    socket.send(data);
  });
});