rt {
        readonly attribute RTCIceGathererState  gatheringState;
        ...
      };

      enum RTCIceGathererState {
        "new",
        "gathering",
        "complete"
      };
   */

  /*
    4.4.2.  RTCIceGatheringState Enum
      new
        Any of the RTCIceTransport s are in the new gathering state and
        none of the transports are in the gathering state, or there are
        no transports.
   */
  test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
