test_link_prefetch.html

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<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=580313

-->

<head>

  <title>Test Prefetch (bug 580313)</title>

  <script src="/tests/SimpleTest/SimpleTest.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=580313">Mozilla Bug 580313</a>

<p id="display"></p>

<div id="content" style="display: none">

</div>

<pre id="test">

<script type="application/javascript">

  SimpleTest.waitForExplicitFinish();

  var prefetch = SpecialPowers.Cc["@mozilla.org/prefetch-service;1"].

                   getService(SpecialPowers.Ci.nsIPrefetchService);

  var ios = SpecialPowers.Cc["@mozilla.org/network/io-service;1"].

            getService(SpecialPowers.Ci.nsIIOService);

  is(prefetch.hasMoreElements(), false, "No prefetches at the test start.");

  var linkElem = document.createElement('link');

  linkElem.rel = "prefetch";

  // Href is empty.

  document.head.appendChild(linkElem);

  is(prefetch.hasMoreElements(), false,

     "If href is not a valid uri, a prefetch has not been started.");

  // Change uri of an existing link. Now it is a valid uri and

  // a prefetch should start.

  linkElem.href = "https://example.com/1";

  is(prefetch.hasMoreElements(), true,

     "Setting the href to a valid uri has started a new prefetch.");

  // Removing a link, removes its prefetch.

  document.head.removeChild(linkElem);

  is(prefetch.hasMoreElements(), false,

     "Removing the link has canceled the prefetch.");

  // Add link again.

  document.head.appendChild(linkElem);

  is(prefetch.hasMoreElements(), true,

     "Adding link again, has started the prefetch again.");

  // Changing the href should cancel the current prefetch.

  linkElem.href = "https://example.com/2";

  is(prefetch.hasMoreElements(), true,

     "Changing href, a new prefetch has been started.");

  // To check if "https://example.com/1" prefetch has been canceled, we try to

  // cancel it using PrefetService. Since the prefetch for

  // "https://example.com/1" does not exist, the cancel will throw.

  var cancelError = 0;

  try {

    var uri = ios.newURI("https://example.com/1");

    prefetch.cancelPrefetchPreloadURI(uri, linkElem);

  } catch(e) {

    cancelError = 1;

  is(cancelError, 1, "This prefetch has aleady been canceled");

  // Now cancel the right uri.

  cancelError = 0;

  try {

    var uri = ios.newURI("https://example.com/2");

    prefetch.cancelPrefetchPreloadURI(uri, linkElem);

  } catch(e) {

    cancelError = 1;

  is(cancelError, 0, "This prefetch has been canceled successfully");

  is(prefetch.hasMoreElements(), false, "The prefetch has already been canceled.");

  // Removing the link will do nothing regarding prefetch service.

  document.head.removeChild(linkElem);

  // Adding two links to the same uri and removing one will not remove the other.

  document.head.appendChild(linkElem);

  is(prefetch.hasMoreElements(), true,

     "Added one prefetch for 'https://example.com/2'.");

  var linkElem2 = document.createElement('link');

  linkElem2.rel = "prefetch";

  linkElem2.href = "https://example.com/2";

  document.head.appendChild(linkElem2);

  is(prefetch.hasMoreElements(), true,

     "Added second prefetch for 'https://example.com/2'.");

  // Remove first link element. This should not remove the prefetch.

  document.head.removeChild(linkElem);

  is(prefetch.hasMoreElements(), true,

     "The prefetch for 'https://example.com/2' is still present.");

  // Remove the second link element. This should remove the prefetch.

  document.head.removeChild(linkElem2);

  is(prefetch.hasMoreElements(), false,

     "There is no prefetch.");

  SimpleTest.finish();

</script>

</pre>

</body>

</html>