class AltsHandshakerStub {

  public void close() {
    writer.onCompleted();
  }

    AltsHandshakerStub(HandshakerServiceStub serviceStub);
  @VisibleForTesting  AltsHandshakerStub();
  @VisibleForTesting  AltsHandshakerStub(StreamObserver<HandshakerReq> writer);

}