RTCDataChannel-id-reuse.html

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This WPT test may be referenced by the following Test IDs:
- /webrtc/RTCDataChannel-id-reuse.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<meta name="timeout" content="long">

<title>Test cases that verify datachannel ids are reused in the expected way. The spec is not very picky here, but we want to be.</title>

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

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

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

<script src="/webrtc/RTCDataChannel-helper.js"></script>

<script>

'use strict';

promise_test(async t => {

  const offerer = new RTCPeerConnection();

  const answerer = new RTCPeerConnection();

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

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

  const pairPromise = openChannelPair(offerer, answerer, 'ensure_datachannel_msection');

  await negotiate(offerer, answerer);

  const [dco, dca] = await pairPromise;

  const id = dco.id;

  assert_equals(dca.id, id);

  dco.close();

  await new Promise(r => dco.onclose = r);

  answerer.addEventListener('datachannel', ({channel}) => {

    channel.addEventListener('message', ({data}) => {

      // echo data back to sender

      channel.send(data);

      // close channel

      channel.close();

})

});

  for (let i = 0; i < 1000; i++) {

    const dc = offerer.createDataChannel(`dc ${i}`);

    await new Promise(r => dc.onopen = r);

    assert_equals(dc.id, id);

    dc.send("ping");

    dc.close();

    await new Promise(r => dc.onclose = r);

}, 'Test that repeated open/send/close with minimal waiting uses the same id every time');

</script>