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chromium/third_party/blink/web_tests/external/wpt/webrtc/RTCSctpTransport-maxChannels.html 

<!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>