dom/tests/mochitest/whatwg/test_bug500328.html
author Boris Zbarsky <bzbarsky@mit.edu>
Thu, 12 Dec 2013 16:11:56 -0500
changeset 160272 47efe38fe54098339f94b196f9a964474d151468
parent 138090 c6ecfbeb6553f84a823f2d1f23b126df18bce952
child 243738 50865b3243b6398b60e42350e3d34841cdace1c3
permissions -rw-r--r--
Bug 949471. history.state should be null, not undefined, when there is no state. r=smaug

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=500328
-->
<head>
  <title>Test for Bug 500328</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=500328">Mozilla Bug 500328</a>
<p id="display"></p>
<div id="status"></div>
<div id="content">
  <iframe id="iframe"></iframe>
  <iframe id="iframe2"></iframe>
  <a id="link">link</a>
</div>
<pre id="test">
<script type="application/javascript;version=1.7">

/** Test for Bug 500328 **/

SimpleTest.waitForExplicitFinish();

var iframe = document.getElementById("iframe");
var iframeCw = iframe.contentWindow;

var iframe2 = document.getElementById("iframe2");
var iframe2Cw = iframe2.contentWindow;

const unvisitedColor = "rgb(0, 0, 238)";
const visitedColor = "rgb(85, 26, 139)";

var gCallbackOnIframeLoad = false;
var gCallbackOnIframePageShow = false;
var gCallbackOnPopState = false;
var gNumPopStates = 0;
var gLastPopStateEvent;
var gLastScriptHistoryState;

var gGen;

function statusMsg(msg) {
  var msgElem = document.createElement("p");
  msgElem.appendChild(document.createTextNode(msg));

  document.getElementById("status").appendChild(msgElem);
}

function longWait() {
  function hitEventLoop(times, func) {
    if (times > 0) {
      setTimeout(hitEventLoop, 0, times - 1, func);
    } else {
      setTimeout(func, 0);
    }
  }
  hitEventLoop(100, function() { gGen.next(); });
}

function shortWait() {
  setTimeout(function() { gGen.next(); }, 0);
}

function onChildPopState(e) {
  gNumPopStates++;
  gLastPopStateEvent = e;
  if (gCallbackOnPopState) {
    statusMsg("Popstate(" + JSON.stringify(e.state) + ").  Calling gGen.next().");
    gCallbackOnPopState = false;
    gGen.next();
  }
  else {
    statusMsg("Popstate(" + JSON.stringify(e.state) + ").  NOT calling gGen.next().");
  }
}

function onChildScript(state) {
  gLastScriptHistoryState = state;
}

function getURLFromEvent(e) {
  try {
    var target = e.target;
    if ("contentWindow" in target) {
      return target.contentWindow.location.toString();
    }
    if ("ownerDocument" in target && target.ownerDocument) {
      return target.ownerDocument.location.toString();
    }
    if ("location" in target) {
      return target.location.toString();
    }
    return target.toString();
  }
  catch(ex) {
    return "<cross-site object>";
  }
}

function onChildLoad(e) {
  if(gCallbackOnIframeLoad) {
    statusMsg("Got load for " + getURLFromEvent(e) + ".  About to call gGen.next().");
    gCallbackOnIframeLoad = false;
    gGen.next();
  }
  else {
    statusMsg("Got load for " + getURLFromEvent(e) + ", but not calling gGen.next() because gCallbackOnIframeLoad was false.");
  }
}

function onChildPageShow(e) {
  if(gCallbackOnIframePageShow) {
    statusMsg("Got pageshow for " + getURLFromEvent(e) + ".  About to call gGen.next().");
    gCallbackOnIframePageShow = false;
    SimpleTest.executeSoon(function() { gGen.next(); });
  }
  else {
    statusMsg("Got pageshow for " + getURLFromEvent(e) + ", but not calling gGen.next() because gCallbackOnIframePageShow was false.");
  }
}

function enableChildLoadCallback() {
  gCallbackOnIframeLoad = true;
}

function enableChildPageShowCallback() {
  gCallbackOnIframePageShow = true;
}

function enableChildPopStateCallback() {
  gCallbackOnPopState = true;
}

function clearPopStateCounter() {
  gNumPopStates = 0;
}

function noPopStateExpected(msg) {
  is(gNumPopStates, 0, msg);

  // Even if there's an error, set gNumPopStates to 0 so other tests don't
  // fail.
  gNumPopStates = 0;
}

function popstateExpected(msg) {
  is(gNumPopStates, 1, msg);
  gNumPopStates = 0;
}

function getColor(elem) {
  var utils = SpecialPowers.wrap(document).defaultView.
                QueryInterface(SpecialPowers.Ci.nsIInterfaceRequestor).
                getInterface(SpecialPowers.Ci.nsIDOMWindowUtils);
  return utils.getVisitedDependentComputedStyle(elem, "", "color");
}

function getSHistory(theWindow)
{
  const Ci = SpecialPowers.Ci;
  var sh = SpecialPowers.wrap(theWindow.QueryInterface(Ci.nsIInterfaceRequestor))
                        .getInterface(Ci.nsIWebNavigation)
                        .sessionHistory;
  if (!sh || sh == null)
    throw("Couldn't get shistory for window!");

  return sh;
}

function getSHTitle(sh, offset)
{
  if (!offset)
    offset = 0;

  // False instructs the SHistory not to modify its current index.
  return sh.getEntryAtIndex(sh.index + offset, false).title;
}

// Tests that win's location ends with str
function locationEndsWith(win, str) {
  var exp = new RegExp(str + "$");
  ok(win.location.toString().match(exp),
     "Wrong window location.  Expected it to end with " +
     str + ", but actuall was " + win.location);
}

function expectException(func, msg) {
  var failed = false;
  try {
    func();
  } catch(ex) {
    failed = true;
  }

  ok(failed, msg + " succeeded, but should have failed.");
}

function runTest() {
  // We can't enable universal XPConnect privleges in this function, because
  // test 5 needs to be running at normal privleges in order to test the
  // same-origin policy.

  /**
   * PRELIMINARY:
   *  1. Clear the popstate counter
   */

  clearPopStateCounter();

  // The URL of file_bug500328_1.html on http://localhost:8888
  var innerLoc;

  // Now we can start the tests

  /**
   * TEST 1 tests basic pushState functionality
   */
  enableChildLoadCallback();
  iframeCw.location = "file_bug500328_1.html";
  yield undefined;
  innerLoc = iframeCw.location.toString();
  // No popstate during initial load.
  shortWait();
  yield undefined;
  noPopStateExpected("No initial popstate.");
  is(JSON.stringify(gLastScriptHistoryState), "null", "null initial state.");
  statusMsg("Awake after first load.");

  // Make sure that the pushstate below doesn't trigger a hashchange.
  iframeCw.onhashchange = function() {
    ok(false, "Pushstate shouldn't trigger a hashchange.");
  };

  var testObj1 = 42;
  var testObj2 = { x: 4.2 };
  iframeCw.history.pushState(testObj1, "test 1");
  is(JSON.stringify(iframeCw.history.state), JSON.stringify(testObj1),
     "correct state after pushState");
  is(iframeCw.location.search, "",
     "First pushstate should leave us where we were.");

  iframeCw.history.pushState(testObj2, "test 1#foo", "?test1#foo");
  is(JSON.stringify(iframeCw.history.state), JSON.stringify(testObj2),
     "correct state after pushState");
  isnot(iframeCw.history.state, testObj2,
     "correct state object identity after pushState");
  is(iframeCw.location.search, "?test1",
     "Second pushstate should push us to '?test1'.");
  is(iframeCw.location.hash, "#foo",
     "Second pushstate should push us to '#foo'");
  shortWait();
  yield undefined;

  // Let the hashchange event fire, if it's going to.
  longWait();
  yield undefined;
  iframeCw.onhashchange = null;

  statusMsg("About to go back to page 1.");
  // We don't have to yield here because this back() and the resulting popstate
  // are completely synchronous.  In fact, if we did yield, JS would throw an
  // error because we'd be calling gGen.next from within gGen.next.
  iframeCw.history.back();

  statusMsg("Awake after going back to page 1.");
  popstateExpected("Going back to page 1 should trigger a popstate.");
  is(gLastPopStateEvent.isTrusted, true, 'Popstate event should be trusted.');
  is(JSON.stringify(gLastPopStateEvent.state), JSON.stringify(testObj1),
     "Wrong state object popped after going back to page 1.");
  ok(gLastPopStateEvent.state === iframeCw.history.state,
     "Wrong state object in document after going back to page 1.");
  ok(iframeCw.location.toString().match(/file_bug500328_1.html$/),
      "Going back to page 1 hould take us to original page.");

  iframeCw.history.back();
  popstateExpected("Going back to page 0 should trigger a popstate.");
  ise(gLastPopStateEvent.state, null,
      "Going back to page 0 should pop a null state.");
  ise(iframeCw.history.state, null,
      "Going back to page 0 should pop a null state.");
  ise(iframeCw.location.search, "",
      "Going back to page 0 should clear the querystring.");

  iframeCw.history.forward();
  popstateExpected("Going forward to page 1 should trigger a popstate.");
  is(JSON.stringify(gLastPopStateEvent.state), JSON.stringify(testObj1),
      "Wrong state object popped after going forward to page 1.");
  ise(gLastPopStateEvent.state, iframeCw.history.state,
      "Wrong state object in document after going forward to page 1.");
  ok(iframeCw.location.toString().match(/file_bug500328_1.html$/),
      "Going forward to page 1 should leave us at original page.");

  statusMsg("About to go forward to page 2.");
  iframeCw.history.forward();
  statusMsg("Awake after going forward to page 2.");
  popstateExpected("Going forward to page 2 should trigger a popstate.");
  is(JSON.stringify(gLastPopStateEvent.state), JSON.stringify(testObj2),
     "Wrong state object popped after going forward to page 2.");
  ise(iframeCw.history.state, gLastPopStateEvent.state,
     "Wrong state object in document after going forward to page 2.");
  ok(iframeCw.location.toString().match(/file_bug500328_1.html\?test1#foo$/),
     "Going forward to page 2 took us to " + iframeCw.location.toString());

  statusMsg("About to reload page 2.");
  iframeCw.location.reload();
  enableChildLoadCallback();
  yield undefined;
  statusMsg("Awake after reloading page 2.");
  noPopStateExpected("Reloading page 2 should not trigger popstate.");
  is(JSON.stringify(iframeCw.history.state), JSON.stringify(testObj2),
     "Wrong state object after reloading page 2.");
  is(JSON.stringify(gLastScriptHistoryState), JSON.stringify(testObj2),
     "Wrong state object while reloading page 2.");
  ok(iframeCw.location.toString().match(/file_bug500328_1.html\?test1#foo$/),
     "Reloading page 2 took us to " + iframeCw.location.toString());

  // The iframe's current location is file_bug500328_1.html?test1#foo.
  // Clicking link1 should take us to file_bug500328_1.html?test1#1.

  enableChildPopStateCallback();
  sendMouseEvent({type:'click'}, 'link-anchor1', iframeCw);
  yield undefined;
  popstateExpected("Clicking on link-anchor1 should trigger a popstate.");
  is(iframeCw.location.search, "?test1",
      "search should be ?test1 after clicking link.");
  is(iframeCw.location.hash, "#1",
      "hash should be #1 after clicking link.");
  ise(iframeCw.history.state, null,
     "Wrong state object in document after clicking link to hash '#1'.");

  /*
   * Reload file_bug500328_1.html; we're now going to test that link hrefs
   * and colors are updated correctly on push/popstates.
   */

  iframe.onload = onChildLoad;
  enableChildLoadCallback();
  iframeCw.location = "about:blank";
  yield undefined;
  enableChildLoadCallback();
  iframeCw.location = "file_bug500328_1.html";
  yield undefined;
  noPopStateExpected("No popstate after re-loading file_bug500328_1.html");
  statusMsg("Done loading file_bug500328_1.html for the second time.");

  var ifLink = iframeCw.document.getElementById("link-anchor1");
  var rand = Date.now() + "-" + Math.random();
  ifLink.href = rand;

  // Poll the document until the link has the correct color, or this test times
  // out.  Unfortunately I can't come up with a more elegant way to do this.
  // We could listen to MozAfterPaint, but that doesn't guarantee that we'll
  // observe the new color.
  while (getColor(ifLink) != unvisitedColor) {
    // Dump so something shows up in the mochitest logs if we spin here.
    dump("ifLink has wrong initial color.  Spinning...\n");
    setTimeout(function() { gGen.next(); }, 0);
    yield undefined;
  }

  // Navigate iframe2 to dir/${rand}
  iframe2.onload = onChildLoad;
  enableChildLoadCallback();
  iframe2Cw.location = "mytestdir/" + rand;
  yield undefined;

  // PushState the iframe into the mytestdir directory.  This should cause
  // ifLink to turn purple, since we just visited mytestdir/${rand} in iframe2.
  iframeCw.history.pushState(null, "foo", "mytestdir/foo");

  // Check that the link's color is now visitedColor
  while (getColor(ifLink) != visitedColor) {
    dump("ifLink has wrong color after pushstate.  Spinning...\n");
    setTimeout(function() { gGen.next(); }, 0);
    yield undefined;
  }

  ok(ifLink.href.match("mytestdir\\/" + rand + "$"),
     "inner frame's link should end with 'mytestdir/${rand}'");

  // Navigate out of the mytestdir directory.  This should cause ifLink to turn
  // blue again.
  iframeCw.history.pushState(null, "bar", "../file_bug500328_1.html");

  // Check that the link's color is back to the unvisited color.
  while (getColor(ifLink) != unvisitedColor) {
    dump("ifLink has wrong color after pushstating out of dir.  Spinning...\n");
    setTimeout(function() { gGen.next(); }, 0);
    yield undefined;
  }

  ok(!ifLink.href.match("mytestdir"),
     "inner frame's link shouldn't contain 'mytestdir'.");

  /*
   * TEST 2 tests that pushstate's same-origin checks are correct.
   */
  var filename = 'file_bug500328_2.html';
  var dirname = document.location.pathname.replace(/[^\/]*$/, '');
  statusMsg("Dirname is: " + dirname);
  iframeCw.location = filename;
  iframe.onload = onChildLoad;
  enableChildLoadCallback();
  yield undefined;

  // This function tries to pushstate and replacestate to the given URL and
  // fails the test if the calls succeed.
  var tryBadPushAndReplaceState = function(url) {
    // XXX ex should be a SECURITY_ERR, not a plain Error.

    var hist = iframeCw.history;
    var url2 = url + dirname + filename;

    expectException(function() { hist.pushState({}, "foo", url); },
                    'pushState to ' + url);

    expectException(function() { hist.pushState({}, "foo", url2); },
                    'pushState to ' + url2);

    expectException(function() { hist.replaceState({}, "foo", url); },
                    'replaceState to ' + url);

    expectException(function() { hist.replaceState({}, "foo", url2); },
                    'replaceState to ' + url2);
  }

  // We're currently at http://example.com/[dirname]/[filename]
  tryBadPushAndReplaceState("https://mochi.test:8888");
  tryBadPushAndReplaceState("http://foo.mochitest:8888");
  tryBadPushAndReplaceState("http://mochi.test:1234");
  tryBadPushAndReplaceState("http://mochi.test.a:8888");
  tryBadPushAndReplaceState("http://mochi.tes:8888");
  tryBadPushAndReplaceState("http://mmochi.test:8888");
  tryBadPushAndReplaceState("http://me@mochi.test:8888");

  /**
   * TEST 3 tests that the session history entries' titles are properly sync'ed
   * after push/pop states.
   *
   * We have to run this test in a popup rather than an iframe because only the
   * root docshell has a session history object.
   */
  statusMsg("About to open popup.");
  var popup = window.open("file_bug500328_1.html", "popup0",
                          "height=200,width=200,location=yes," +
                          "menubar=yes,status=yes,toolbar=yes,dependent=yes");

  enableChildLoadCallback();
  var shistory = getSHistory(popup);
  yield undefined;
  shortWait();
  yield undefined;
  noPopStateExpected("Shouldn't get popstate after opening window.");

  popup.history.pushState(null, "title 0");
  ok(SpecialPowers.isBackButtonEnabled(popup),
     "Back button was not enabled after initial pushstate.");

  popup.document.title = "title 1";

  // Yield to the event loop so listeners will be notified of the title change
  // and so that the hash change we trigger below generates a new session
  // history entry.
  shortWait();
  yield undefined;

  // Check that the current session history entry's title has been updated to
  // reflect the new document title.
  is(getSHTitle(shistory), "title 1", "SHEntry title test 1");

  // Change the page's hash to #1, which will trigger a popstate event.
  // We don't have to wait, because this happens synchronously.
  popup.location.hash = "#1";
  popstateExpected("Didn't get popstate after changing hash.");

  popup.document.title = "title 2";

  // Yield so listeners will be notified of the title change we just performed.
  shortWait();
  yield undefined;

  is(getSHTitle(shistory), "title 2", "SHEntry title test 2");

  // Go back.  Happens synchronously.  We should get a popstate.
  statusMsg("About to go back.");
  popup.history.go(-1);
  popstateExpected("Didn't get a popstate after going back.");

  // Even though we went back, we expect the SHEntry title to remain the same
  // because the document didn't change.
  is(getSHTitle(shistory), "title 2", "SHEntry title test 3");

  popup.document.title = "Changed 1";
  shortWait();
  yield undefined;

  // This check is really a test of bug 509055.
  is(getSHTitle(shistory), "Changed 1", "SHEntry title test 4");

  popup.close();

  /**
   * TEST 4 tests replaceState and that we don't get double popstates on
   * window.open.  It also stress-tests the system and its interaction with
   * bfcache by making many push/replace state calls.
   */
  popup = window.open("file_bug500328_1.html", "popup1",
                      "height=200,width=200,location=yes," +
                      "menubar=yes,status=yes,toolbar=yes,dependent=yes");

  // The initial about:blank load into the new window shouldn't result in us
  // seeing a popstate.  Once file_bug500328_1.html is loaded, it'll overwrite
  // popup.onpopstate, and this assertion won't fire for that popstate and
  // others after.
  //
  // If we fired the popstate event asynchronously, we'd expect this assert to
  // fire.
  popup.onpopstate = function() {
    ok(false, "Initial load of popup shouldn't give us a popstate.");
  };

  shistory = getSHistory(popup);

  enableChildLoadCallback();
  yield undefined;
  statusMsg("Awake after loading content into popup.");

  popup.history.replaceState({n:1, ok:true}, "state 1", "good1.html");
  locationEndsWith(popup, "good1.html");

  // Even though we replaceState with title "state 1", the title should remain
  // "test 1" because we ignore the title argument in push/replaceState.  
  // See bug 544535.
  is(getSHTitle(shistory), "test 1", "SHEntry title 'state 1'");

  // Flush the event loop so our next load creates a new session history entry.
  shortWait();
  yield undefined;

  enableChildLoadCallback();
  popup.location = "file_bug500328_1.html";
  yield undefined;

  // Flush the event loop so nsDocShell::OnNewURI runs and our load is recorded
  // properly.
  shortWait();
  yield undefined;

  // Now go back and make sure everything is as it should be.
  enableChildPageShowCallback();
  popup.history.back();
  yield undefined;
  // Flush the event loop so the document's location is updated and any
  // popstates fire.
  shortWait();
  yield undefined;
  noPopStateExpected("no popstate during initial load");

  locationEndsWith(popup, "good1.html");
  is(JSON.stringify(popup.history.state), '{"n":1,"ok":true}',
     "Wrong state popped after going back to initial state.");

  // We're back at state 0, which was replaceState-ed to state1.html.  Let's do
  // some push/pop/replaces to make sure everything works OK when we involve
  // large numbers of SHEntries.
  for(var i = 2; i <= 30; i++) {
    if (i % 3 == 0) {
      popup.history.pushState({n:i, ok:true}, "state " + i, "good" + i + ".html");
    }
    else {
      popup.history.pushState({n:i}, "state " + i, "state" + i + ".html");
      for(var j = 0; j < i % 4; j++) {
        popup.history.replaceState({n:i, nn:j}, "state " + i + ", " + j);
      }
      popup.history.replaceState({n:i, ok:true}, "state " + i, "good" + i + ".html");
    }
  }

  for(var i = 29; i >= 1; i--) {
    popup.history.back();
    popstateExpected("Didn't get a popstate on iteration " + i);
    locationEndsWith(popup, "good" + i + ".html");
    is(gLastPopStateEvent.state.n, i, "Bad counter on last popstate event.");
    ok(gLastPopStateEvent.state.ok,
       "Last popstate event should have 'ok' set to true.");
  }

  popup.close();

  /**
   * TEST 5 tests misc security features and implementation details of
   * Push/ReplaceState
   */

  /*
   * Test that we can't push/replace an object with a large (over 640k
   * characters) JSON representation.
   */

  // (In case you're curious, this loop generates an object which serializes to
  // 694581 characters.)
  var bigObject = new Object();
  for(var i = 0; i < 51200; i++) {
    bigObject[i] = i;
  }
  // statusMsg("Big object has size " + JSON.stringify(bigObject).length);

  // We shouldn't be able to pushstate this large object, due to space
  // constraints.
  expectException(
    function() { iframeCw.history.pushState(bigObject, "foo"); },
    "pushState-ing large object");

  expectException(
    function() { iframeCw.history.replaceState(bigObject, "foo"); },
    "replaceState-ing large object");

  /*
   * Make sure we can't push/replace state on an iframe of a different origin.
   * This will work if this function has requested Universal XPConnect
   * privileges, so any code which needs those privileges can't be in this
   * function.
   */
  enableChildLoadCallback();
  iframeCw.location = "http://example.com";
  iframe.onload = onChildLoad;
  yield undefined;
  iframe.onload = null;

  expectException(
    function() { iframeCw.history.pushState({}, "foo"); },
    "pushState-ing in a different origin");

  expectException(
    function() { iframeCw.history.replaceState({}, "foo"); },
    "replaceState-ing in a different origin");

  /*
   * If we do the following:
   *   * Start at page A.
   *   * PushState to page B.
   *   * Refresh.  The server responds with a 404
   *   * Go back.
   * Then at the end, page A should be displayed, not the 404 page.
   */
  enableChildLoadCallback();
  iframe.onload = onChildLoad;
  iframeCw.location = "about:blank";
  yield undefined;
  iframe.onload = null;

  enableChildLoadCallback();
  // navigate to http://mochi.test:8888/[...]/file_bug500328_1.html
  iframeCw.location = innerLoc;
  yield undefined;

  // PushState to a URL which doesn't exist
  iframeCw.history.pushState({}, "", rand);

  // Refresh.  We'll end up a 404 page.
  iframe.onload = onChildLoad;
  enableChildLoadCallback();
  iframeCw.location.reload(true);
  yield undefined;
  iframe.onload = null;

  // Since the last page was a 404, going back should actually show the
  // contents of the old page, instead of persisting the contents of the 404
  // page.
  enableChildPageShowCallback();
  iframeCw.history.back();
  yield undefined;

  // Make sure that we're actually showing the contents of
  // file_bug500328_1.html, as opposed to the 404 page.
  var identifierElem = iframeCw.document.getElementById("link-anchor1");
  ok(identifierElem != undefined && identifierElem != null,
     "iframe didn't contain file_bug500328_1.html's contents.");

  /**
   * TEST 6 tests that the referrer is set properly after push/replace states.
   */

  /*
   * First, a simple test:
   *   * Load file_bug500328_1.html into iframe
   *   * PushState to newpage1.html#foo
   *   * Instruct the iframe to load file_bug500328_1.html into itself.
   * The referer should be newpage1.html, without the hash.
   *
   * This also tests that we can call pushState from within the onload handler.
   */
  enableChildLoadCallback();
  iframeCw.location = "file_bug500328_1.html";
  yield undefined;

  // Run within the onload handler.  This should work without issue.
  iframeCw.history.pushState(null, "", "newpage1.html");

  // iframeCw.navigateTo() causes the iframe to set its location on our
  // behalf.  We can't just set its location ourselves, because then *we*
  // become the referrer.
  enableChildLoadCallback();
  iframeCw.navigateTo("file_bug500328_1.html");
  yield undefined;

  ok(iframeCw.document.referrer.toString().match(/newpage1.html$/),
     "Wrong referrer after pushState.  Expected newpage1.html, but was " +
     iframeCw.document.referrer);

  /*
   * We're back at file_bug500328_1.html.  Now do the following:
   *   * replaceState to newpage2.html#foo
   *   * Click a link back to file_bug500328_1.html
   * The referrer should be newpage2.html, without the hash.
   */
  iframeCw.history.replaceState(null, null, "newpage2.html#foo");
  enableChildLoadCallback();
  sendMouseEvent({type:'click'}, 'link-self', iframeCw);
  yield undefined;

  ok(iframeCw.document.referrer.toString().match(/newpage2.html$/),
     "Wrong referrer after replaceState.  Expected newpage2.html, but was " +
     iframeCw.document.referrer);

  /*
   * Set up a cycle with the popstate event to make sure it's properly
   * collected.
   */
  var evt = document.createEvent("popstateevent");
  evt.initEvent("foo", false, false, evt);

  /* */
  SimpleTest.finish();
  statusMsg("********** Finished tests ***********");
  while(true)
  {
    yield undefined;

    // I don't think this will actually make the mochitest fail, but there's
    // not much we can do about this.  Realistically, though, regressions are
    // not likely to fire extra events -- this trap is here mostly to catch
    // errors made while wriring tests.
    ok(false, "Got extra event!");
  }

  /*
  statusMsg("XXXXXXXXXXXXXX");
  while(true) {
    yield undefined;
    statusMsg("Woken up.");
  }
  */
}

// Important: Wait to start the tests until the page has loaded.  Otherwise,
// the test will occasionally fail when it begins running before the iframes
// have finished their initial load of about:blank.
window.addEventListener('load', function() {
  gGen = runTest();
  gGen.next();
}, false);

</script>
</pre>
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</html>