@Test
public void readAckSettingsFrame() throws Http2Exception {

    ByteBuf input = Unpooled.buffer();
    try {
        writeFrameHeader(input, 0, SETTINGS, new Http2Flags().ack(true), 0);
        frameReader.readFrame(ctx, input, listener);
        listener.onSettingsAckRead(ctx);
    } finally {
        input.release();
    }
}