webrtc/protocol/sctp-format.html

<!doctype html>
<meta charset=utf-8>
<title>RTCPeerconnection SDP SCTP format test</title>
<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 caller = new RTCPeerConnection();
  const callee = new RTCPeerConnection();
  t.add_cleanup(() => caller.close());
  t.add_cleanup(() => callee.close());
  caller.createDataChannel('channel');
  const offer = await caller.createOffer();
  const [preamble, media_section, postamble] = offer.sdp.split('\r\nm=');
  assert_true(typeof(postamble) === 'undefined');
  assert_greater_than(media_section.search(
    /^application \d+ UDP\/DTLS\/SCTP webrtc-datachannel\r\n/), -1);
  assert_greater_than(media_section.search(/\r\na=sctp-port:\d+\r\n/), -1);
  assert_greater_than(media_section.search(/\r\na=mid:/), -1);
}, 'Generated Datachannel SDP uses correct SCTP offer syntax');

</script>