socket.io/test/socket.js

var expect = require('expect.js');
var eio = require('../');

describe('Socket', function () {
  this.timeout(10000);

  describe('filterUpgrades', function () {
    it('should return only available transports', function () {
      var socket = new eio.Socket({'transports': ['polling']});
      expect(socket.filterUpgrades(['polling', 'websocket'])).to.eql(['polling']);
      socket.close();
    });
  });
});