node_modules/xmlhttprequest-ssl/tests/test-events.js

var sys = require("util")
  , assert = require("assert")
  , http = require("http")
  , XMLHttpRequest = require("../lib/XMLHttpRequest").XMLHttpRequest
  , xhr;

// Test server
var server = http.createServer(function (req, res) {
  var body = (req.method != "HEAD" ? "Hello World" : "");

  res.writeHead(200, {
    "Content-Type": "text/plain",
    "Content-Length": Buffer.byteLength(body)
  });
  // HEAD has no body
  if (req.method != "HEAD") {
    res.write(body);
  }
  res.end();
  assert.equal(onreadystatechange, true);
  assert.equal(readystatechange, true);
  assert.equal(removed, true);
  sys.puts("done");
  this.close();
}).listen(8000);

xhr = new XMLHttpRequest();

// Track event calls
var onreadystatechange = false;
var readystatechange = false;
var removed = true;
var removedEvent = function() {
  removed = false;
};

xhr.onreadystatechange = function() {
  onreadystatechange = true;
};

xhr.addEventListener("readystatechange", function() {
  readystatechange = true;
});

// This isn't perfect, won't guarantee it was added in the first place
xhr.addEventListener("readystatechange", removedEvent);
xhr.removeEventListener("readystatechange", removedEvent);

xhr.open("GET", "http://localhost:8000");
xhr.send();