old_contents: var express = require('express');
  var path = require('path');
  var app = express();
  
  app.use(express.static(path.join(__dirname, 'app')));
  
  // app.get('/', function(req, res){
  //   res.send('hello world');
  // });
  
  var server = app.listen(3000, function () {
  
    var host = server.address().address;
    var port = server.address().port;
  
    console.log('Example app listening at http://%s:%s', host, port);
  
  });
  
new_contents: var express = require('express');
  var path = require('path');
  var app = express();
  
  app.use(express.static(path.join(__dirname, 'app')));
  
  var server = app.listen(3000, function () {
  
    var host = server.address().address;
    var port = server.address().port;
  
    console.log('Example app listening at http://%s:%s', host, port);
  
  });
  
subject: Remove old test code.