gecko/browser/base/content/test/browser_autodiscovery.js

function url(spec) {
  var ios = Components.classes["@mozilla.org/network/io-service;1"]
                      .getService(Components.interfaces.nsIIOService);
  return ios.newURI(spec, null, null);
}

var gTestPage = null;
function test() {
  waitForExplicitFinish();
  var activeWin = Application.activeWindow;
  gTestPage = activeWin.open(url("chrome://mochikit/content/browser/browser/base/content/test/autodiscovery.html"));
  gTestPage.focus();
  setTimeout(iconDiscovery, 1000);
}

function iconDiscovery() {
  var tests = [
    { text: "rel icon discovered" },
    { rel: "abcdefg icon qwerty", text: "rel may contain additional rels separated by spaces" },
    { rel: "ICON", text: "rel is case insensitive" },
    { rel: "shortcut-icon", pass: false, text: "rel shortcut-icon not discovered" },
    { href: "moz.png", text: "relative href works" },
    { href: "notthere.png", text: "404'd icon is removed properly" },
    { href: "data:image/x-icon,%00", type: "image/x-icon", text: "data: URIs work" },
    { type: "image/png; charset=utf-8", text: "type may have optional parameters (RFC2046)" }
  ];

  for (let i = 0; i < tests.length; i++) {
    gProxyFavIcon.removeAttribute("src");

    var test = tests[i];
    var head = gTestPage.document.getElementById("linkparent");
    var link = gTestPage.document.createElement("link");

    var rel = test.rel || "icon";
    var href = test.href || "chrome://mochikit/content/browser/browser/base/content/test/moz.png";
    var type = test.type || "image/png";
    if (test.pass == undefined)
      test.pass = true;

    link.rel = rel;
    link.href = href;
    link.type = type;
    head.appendChild(link);

    var hasSrc = gProxyFavIcon.hasAttribute("src");
    if (test.pass)
      ok(hasSrc, test.text);
    else
      ok(!hasSrc, test.text);

    head.removeChild(link);
  }
  searchDiscovery();
}

function searchDiscovery() {
  var tests = [
    { text: "rel search discovered" },
    { rel: "SEARCH", text: "rel is case insensitive" },
    { rel: "-search-", pass: false, text: "rel -search- not discovered" },
    { rel: "foo bar baz search quux", text: "rel may contain additional rels separated by spaces" },
    { href: "https://not.mozilla.com", text: "HTTPS ok" },
    { href: "ftp://not.mozilla.com", text: "FTP ok" },
    { href: "data:text/foo,foo", pass: false, text: "data URI not permitted" },
    { href: "javascript:alert(0)", pass: false, text: "JS URI not permitted" },
    { type: "APPLICATION/OPENSEARCHDESCRIPTION+XML", text: "type is case insensitve" },
    { type: " application/opensearchdescription+xml ", text: "type may contain extra whitespace" },
    { type: "application/opensearchdescription+xml; charset=utf-8", text: "type may have optional parameters (RFC2046)" },
    { type: "aapplication/opensearchdescription+xml", pass: false, text: "type should not be loosely matched" },
    { rel: "search search search", count: 1, text: "only one engine should be added" }
  ];

  for (let i = 0; i < tests.length; i++) {
    var test = tests[i];
    var head = gTestPage.document.getElementById("linkparent");
    var link = gTestPage.document.createElement("link");

    var rel = test.rel || "search";
    var href = test.href || "http://so.not.here.mozilla.com/search.xml";
    var type = test.type || "application/opensearchdescription+xml";
    var title = test.title || i;
    if (test.pass == undefined)
      test.pass = true;

    link.rel = rel;
    link.href = href;
    link.type = type;
    link.title = title;
    head.appendChild(link);

    var browser = gBrowser.getBrowserForDocument(gTestPage.document);
    if (browser.engines) {
      var hasEngine = (test.count) ? (browser.engines[0].title == title &&
                                      browser.engines.length == test.count) :
                                     (browser.engines[0].title == title);
      ok(hasEngine, test.text);
      browser.engines = null;
    }
    else
      ok(!test.pass, test.text);
  }
  gTestPage.close();
  finish();  
}