<!DOCTYPE html>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText()
        testRunner.waitUntilDone();
    }
</script>
<script src="/js-test-resources/js-test.js"></script>
<script>
    // The rand value is necessary to cache-bust slow resources.
    var imageURL = "http://127.0.0.1:8000/resources/slow-image.py?rand=" + Math.random();
    function test() {
        setTimeout(function() {
            var entries = performance.getEntriesByName(imageURL).length;
            shouldBe(entries.toString(), "1");

            if (window.testRunner)
                testRunner.notifyDone();
        }, 0);
    };
    document.write("<link rel=preload href='" + imageURL + "' as=image>");
</script>
<body>
<script>
    window.addEventListener("load", function() {
        var img = new Image();
        img.onload = test;
        img.src = imageURL;
    });
</script>
</body>