DefaultHttp2FrameStream newStream() {
        return new DefaultHttp2FrameStream();
    }
@Test
    public void writeHeadersVoidPromise() {
        final Http2FrameStream stream = frameCodec.newStream();
        channel.writeAndFlush(new DefaultHttp2HeadersFrame(new DefaultHttp2Headers()).stream(stream),
                channel.voidPromise());
    }