node/test/parallel/test-http-agent-error-on-idle.js

'use strict';
var common = require('../common');
var assert = require('assert');
var http = require('http');
var Agent = http.Agent;

var agent = new Agent({
  keepAlive: true,
});

var requestParams = {
  host: 'localhost',
  port: common.PORT,
  agent: agent,
  path: '/'
};

var socketKey = agent.getName(requestParams);

function get(callback) {
  return http.get(requestParams, callback);
}

var server = http.createServer(function(req, res) {
  res.end('hello world');
});

server.listen(common.PORT, function() {
  get(function(res) {
    assert.equal(res.statusCode, 200);
    res.resume();
    res.on('end', function() {
      process.nextTick(function() {
        var freeSockets = agent.freeSockets[socketKey];
        assert.equal(freeSockets.length, 1,
                     'expect a free socket on ' + socketKey);

        //generate a random error on the free socket
        var freeSocket = freeSockets[0];
        freeSocket.emit('error', new Error('ECONNRESET: test'));

        get(done);
      });
    });
  });
});

function done() {
  assert.equal(Object.keys(agent.freeSockets).length, 0,
              'expect the freeSockets pool to be empty');

  agent.destroy();
  server.close();
  process.exit(0);
}