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<title>RTCPeerConnection.prototype.iceGatheringState</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 pc1 = new RTCPeerConnection();
  t.add_cleanup(() => pc1.close());
  const pc2 = new RTCPeerConnection();
  t.add_cleanup(() => pc2.close());
  pc1.addTransceiver('audio', { direction: 'recvonly' });
  await initialOfferAnswerWithIceGatheringStateTransitions(
      pc1, pc2);
  await pc1.setLocalDescription(await pc1.createOffer({iceRestart: true}));
  await iceGatheringStateTransitions(pc1, 'gathering', 'complete');
  expectNoMoreGatheringStateChanges(t, pc1);
  await pc1.setLocalDescription({type: 'rollback'});
  await new Promise(r => t.step_timeout(r, 1000));
}, 'rolling back an ICE restart when gathering is complete should not result in iceGatheringState changes');

promise_test(async t => {
  const pc = new RTCPeerConnection();
  t.add_cleanup(() => pc.close());
  pc.addTransceiver('audio', { direction: 'recvonly' });
  await pc.setLocalDescription(
    await pc.createOffer());
  await iceGatheringStateTransitions(pc, 'gathering', 'complete');
  await pc.setLocalDescription({type: 'rollback'});
  await iceGatheringStateTransitions(pc, 'new');
}, 'setLocalDescription(rollback) of original offer should cause iceGatheringState to reach "new" when starting in "complete"');

promise_test(async t => {
  const pc = new RTCPeerConnection();
  t.add_cleanup(() => pc.close());
  pc.addTransceiver('audio', { direction: 'recvonly' });
  await pc.setLocalDescription(
    await pc.createOffer());
  await iceGatheringStateTransitions(pc, 'gathering');
  await pc.setLocalDescription({type: 'rollback'});
  // We might go directly to 'new', or we might go to 'complete' first,
  // depending on timing. Allow either.
  const results = await Promise.allSettled([
    iceGatheringStateTransitions(pc, 'new'),
    iceGatheringStateTransitions(pc, 'complete', 'new')]);
  assert_true(results.some(result => result.status == 'fulfilled'),
    'ICE gathering state should go back to "new", possibly through "complete"');
}, 'setLocalDescription(rollback) of original offer should cause iceGatheringState to reach "new" when starting in "gathering"');

</script>