RTCPeerConnection-add-track-no-deadlock.https.html

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This WPT test may be referenced by the following Test IDs:
- /webrtc/RTCPeerConnection-add-track-no-deadlock.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>RTCPeerConnection addTrack does not deadlock</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="RTCPeerConnection-helper.js"></script>

<script>

  'use strict';

  // This test sets up two peer connections using a sequence of operations

  // that triggered a deadlock in Chrome. See https://crbug.com/736725.

  // If a deadlock is introduced again, this test times out.

  promise_test(async t => {

    const pc1 = new RTCPeerConnection();

    t.add_cleanup(() => pc1.close());

    const stream = await getNoiseStream(

      {audio: false, video: true});

    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));

    const videoTrack = stream.getVideoTracks()[0];

    pc1.addTrack(videoTrack, stream);

    const offer = await pc1.createOffer();

    await pc1.setLocalDescription(offer);

    const pc2 = new RTCPeerConnection();

    t.add_cleanup(() => pc2.close());

    const srdPromise = pc2.setRemoteDescription(offer);

    pc2.addTrack(videoTrack, stream);

    // The deadlock encountered in https://crbug.com/736725 occured here.

    await srdPromise;

    await pc2.createAnswer();

  }, 'RTCPeerConnection addTrack does not deadlock.');

</script>