RTCPeerConnection-onsignalingstatechanged.https.html

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This WPT test may be referenced by the following Test IDs:
- /webrtc/RTCPeerConnection-onsignalingstatechanged.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>RTCPeerConnection onsignalingstatechanged</title>

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

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

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

<script>

promise_test(async t => {

  const [track] = (await getNoiseStream({video: true})).getTracks();

  t.add_cleanup(() => track.stop());

  const pc1 = new RTCPeerConnection();

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

  const pc2 = new RTCPeerConnection();

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

  pc1.addTrack(track, new MediaStream());

  await pc1.setLocalDescription(await pc1.createOffer());

  const events = [];

  pc2.onsignalingstatechange = t.step_func(e => {

    const [transceiver] = pc2.getTransceivers();

    assert_equals(transceiver.currentDirection, null);

    events.push(pc2.signalingState);

});

  await pc2.setRemoteDescription(pc1.localDescription);

  assert_equals(events.length, 1, "event fired");

  assert_equals(events[0], "have-remote-offer");

  pc2.onsignalingstatechange = t.step_func(e => {

    const [transceiver] = pc2.getTransceivers();

    assert_equals(transceiver.currentDirection, "recvonly");

    events.push(pc2.signalingState);

});

  await pc2.setLocalDescription(await pc2.createAnswer());

  assert_equals(events.length, 2, "event fired");

  assert_equals(events[1], "stable");

}, 'Negotiation methods fire signalingstatechange events');

promise_test(async t => {

  const pc1 = new RTCPeerConnection();

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

  const pc2 = new RTCPeerConnection();

  const stream = await getNoiseStream({ audio: true });

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

  stream.getTracks().forEach(track => pc1.addTrack(track, stream));

  exchangeIceCandidates(pc1, pc2);

  exchangeOfferAnswer(pc1, pc2);

  await listenToIceConnected(pc2);

  pc2.onsignalingstatechange = t.unreached_func();

  pc2.close();

  assert_equals(pc2.signalingState, 'closed');

  await new Promise(r => t.step_timeout(r, 100));

}, 'Closing a PeerConnection should not fire signalingstatechange event');

promise_test(async t => {

  const pc1 = new RTCPeerConnection();

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

  const pc2 = new RTCPeerConnection();

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

  pc2.addTransceiver('video');

  pc1.ontrack = t.unreached_func();

  pc1.onsignalingstatechange = t.step_func(e => {

    pc1.ontrack = null;

});

  await pc1.setRemoteDescription(await pc2.createOffer());

}, 'signalingstatechange is the first event to fire');

</script>