<!DOCTYPE html>
<html>
<body>
<script src="/resources/js-test-pre.js"></script>
<script>
description('Tests that a page with a loading image goes into the page cache.');
window.jsTestIsAsync = true;

if (window.testRunner)
    testRunner.overridePreference("WebKitUsesPageCachePreferenceKey", 1);

window.addEventListener("pageshow", function(event) {
    debug("pageshow - " + (event.persisted ? "" : "not ") + "from cache");

    if (event.persisted) {
        testPassed("Page did enter and was restored from the page cache");
        setTimeout(function() {
            finishJSTest();
        }, 0);
    }
}, false);

window.addEventListener("pagehide", function(event) {
    debug("pagehide - " + (event.persisted ? "" : "not ") + "entering cache");
    if (!event.persisted) {
        testFailed("Page did not enter the page cache.");
        finishJSTest();
    }
}, false);

window.addEventListener('load', function() {
    setTimeout(function() {
        // Slow loading image.
        var slowImage = new Image();
        slowImage.src = "/history/resources/slow-image.php";
        document.body.appendChild(slowImage);
    }, 0);

    // This needs to happen in a setTimeout because a navigation inside the onload handler would
    // not create a history entry.
    setTimeout(function() {
      // Force a back navigation back to this page.
      window.location.href = "resources/page-cache-helper.html";
    }, 0);
}, false);

</script>
<script src="/resources/js-test-post.js"></script>
</body>
</html>