<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Shadowing then()</title>
</head>
<body>
<!--
This test verifies that the implementation of navigator.getUserMedia does not use public promise APIs.
-->
<p id="output"></p>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.waitUntilDone();
    }

    function endTest(testStatus) {
        document.getElementById("output").textContent = testStatus;
        testRunner.notifyDone();
    }

    // Shadow Promise.prototype.then
    Promise.prototype.then = (function () {
        const realThen = Promise.prototype.then;
        return function () {
            endTest("FAIL: Executed shadowed, public .then()");
        }
    })();

    function gotUserMedia(mediaStream) {
        endTest("FAIL: Got user media");
    }

    function userMediaError(error) {
        endTest("PASS");
    }

    var options = { audio: false, video: false };
    navigator.getUserMedia(options, gotUserMedia, userMediaError);

</script>
</body>
</html>