LayoutTests/webrtc/dtmf-gc.html

<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <script src="../resources/testharness.js"></script>
        <script src="../resources/testharnessreport.js"></script>
        <script src="../resources/gc.js"></script>
    </head>
    <body>
        <video id="video" autoplay playsInline></video>
        <script src ="routines.js"></script>
        <script>

promise_test(async (test) => {
    let sender;
    const localStream = await navigator.mediaDevices.getUserMedia({audio:true, video:true});
    const stream = await new Promise((resolve, reject) => {
        createConnections((firstConnection) => {
            sender = firstConnection.addTrack(localStream.getAudioTracks()[0], localStream);
            firstConnection.addTrack(localStream.getVideoTracks()[0], localStream);
        }, (secondConnection) => {
            secondConnection.ontrack = (trackEvent) => {
                resolve(trackEvent.streams[0]);
            };
        });
        setTimeout(() => reject("Test timed out"), 5000);
    });

    video.srcObject = stream;
    await video.play();

    const string = '0123456789ABCD';
    let counter = 0;
    const promise = new Promise((resolve, reject) => {
        sender.dtmf.ontonechange = () => {
            if (++counter === string.length)
                resolve();
        };
        setTimeout(() => reject('dtmf timed out with counter ' + counter), 5000);
    });
    sender.dtmf.insertDTMF(string);

    gc();
    gc();
    gc();

    return promise;
}, "Make sure DTMF does not get GCed while it can fire events");
        </script>
    </body>
</html>