mozilla-release/dom/media/tests/mochitest/test_peerConnection_remoteRollback.html

<!DOCTYPE HTML>
<html>
<head>
  <script type="application/javascript" src="pc.js"></script>
</head>
<body>
<pre id="test">
<script type="application/javascript">
  createHTML({
    bug: "952145",
    title: "Rollback remote offer"
  });

  var test;
  runNetworkTest(function (options) {
    test = new PeerConnectionTest(options);
    test.setMediaConstraints([{audio: true}], [{audio: true}]);
    test.chain.removeAfter('PC_REMOTE_CHECK_CAN_TRICKLE_SYNC');
    test.chain.append([
      function PC_REMOTE_ROLLBACK(test) {
        // We still haven't negotiated the tracks
        test.pcRemote.expectNegotiationNeeded();
        return test.setRemoteDescription(test.pcRemote, { type: "rollback" },
                                         STABLE);
      },

      function PC_REMOTE_CHECK_CAN_TRICKLE_REVERT_SYNC(test) {
        is(test.pcRemote._pc.canTrickleIceCandidates, null,
           "Remote canTrickleIceCandidates is reverted to null");
      },

      function PC_LOCAL_ROLLBACK(test) {
        // We still haven't negotiated the tracks
        test.pcLocal.expectNegotiationNeeded();
        return test.setLocalDescription(
          test.pcLocal,
          new RTCSessionDescription({ type: "rollback", sdp: ""}),
          STABLE);
      },

      // Rolling back should shut down gathering
      function PC_LOCAL_WAIT_FOR_END_OF_TRICKLE(test) {
        return test.pcLocal.endOfTrickleIce;
      },
    ]);
    test.chain.append(commandsPeerConnectionOfferAnswer);
    test.run();
  });
</script>
</pre>
</body>
</html>