
<!DOCTYPE HTML>
<html>
<head>
    <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
    <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
    <script type="application/javascript" src="/tests/SimpleTest/SpecialPowers.js"></script>
    <script type="application/javascript">
    // Since BFCache in parent requires no opener, use BroadcastChannel
    // to communicate with file_same_url.html.
    let bc = new BroadcastChannel("test_same_url");
    async function test() {
        var promise;
        let historyLength;

        promise = waitForLoad();
        window.open("file_same_url.html", "_blank", "noopener=yes");
        historyLength = await promise;
        is(historyLength, 1, "before same page navigation");

        promise = waitForLoad();
        bc.postMessage("linkClick");
        historyLength = await promise;
        is(historyLength, 1, "after same page navigation");
        bc.postMessage("closeWin");

        SimpleTest.finish();
    }

    async function waitForLoad() {
        return new Promise(resolve => {
            let listener = e => {
                if (e.data.bodyOnLoad) {
                    bc.removeEventListener("message", listener);
                    setTimeout(() => resolve(e.data.bodyOnLoad), 0);
                }
            };
            bc.addEventListener("message", listener);
        });
    }
    </script>
</head>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1745730">Bug 1745730</a>
<p id="display"></p>
<div id="content" style="display: none">
</div>
<pre id="test">
<script type="text/javascript">
SimpleTest.waitForExplicitFinish();
</script>
</pre>
<body onload="test()">
</body>
</html>

