RTCSctpTransport-maxChannels.html

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This test has a WPT meta file that disables it given conditions:
- : https://bugzilla.mozilla.org/show_bug.cgi?id=1278299
This WPT test may be referenced by the following Test IDs:
- /webrtc/RTCSctpTransport-maxChannels.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>RTCSctpTransport.prototype.maxChannels</title>

<link rel="help" href="https://w3c.github.io/webrtc-pc/#rtcsctptransport-interface">

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

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

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

<script>

'use strict';

promise_test(async (t) => {

  const pc = new RTCPeerConnection();

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

  assert_equals(pc.sctp, null, 'RTCSctpTransport must be null');

  pc.createDataChannel('test');

  const offer = await pc.createOffer();

  await pc.setRemoteDescription(offer);

  const answer = await pc.createAnswer();

  await pc.setLocalDescription(answer);

  assert_not_equals(pc.sctp, null, 'RTCSctpTransport must be available');

  assert_equals(pc.sctp.maxChannels, null, 'maxChannels must not be set');

}, 'An unconnected peerconnection must not have maxChannels set');

promise_test(async (t) => {

    const pc1 = new RTCPeerConnection();

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

  const pc2 = new RTCPeerConnection();

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

  exchangeIceCandidates(pc1, pc2);

  pc1.createDataChannel('');

  const offer = await pc1.createOffer();

  await pc1.setLocalDescription(offer);

  const pc1ConnectedWaiter = waitForState(pc1.sctp, 'connected');

  await pc2.setRemoteDescription(offer);

  const pc2ConnectedWaiter = waitForState(pc2.sctp, 'connected');

  const answer = await pc2.createAnswer();

  await pc2.setLocalDescription(answer);

  await pc1.setRemoteDescription(answer);

  assert_equals(null, pc1.sctp.maxChannels);

  assert_equals(null, pc2.sctp.maxChannels);

  await pc1ConnectedWaiter;

  await pc2ConnectedWaiter;

  assert_not_equals(null, pc1.sctp.maxChannels);

  assert_not_equals(null, pc2.sctp.maxChannels);

  assert_equals(pc1.sctp.maxChannels, pc2.sctp.maxChannels);

}, 'maxChannels gets instantiated after connecting');

</script>