@Override
    protected int rsv(WebSocketFrame msg) {
        return msg instanceof TextWebSocketFrame || msg instanceof BinaryWebSocketFrame?
                msg.rsv() | WebSocketExtension.RSV1 : msg.rsv();
    }
@Test
    public void testFragmentedFrame() {
        EmbeddedChannel encoderChannel = new EmbeddedChannel(new PerMessageDeflateEncoder(9, 15, false,
                                                                                          NEVER_SKIP));
        EmbeddedChannel decoderChannel = new EmbeddedChannel(
                ZlibCodecFactory.newZlibDecoder(ZlibWrapper.NONE));

        // initialize
        byte[] payload1 = new byte[100];
        random.nextBytes(payload1);
        byte[] payload2 = new byte[100];
        random.nextBytes(payload2);
        byte[] payload3 = new byte[100];
        random.nextBytes(payload3);

        BinaryWebSocketFrame frame1 = new BinaryWebSocketFrame(false,
                                                               WebSocketExtension.RSV3,
                                                               Unpooled.wrappedBuffer(payload1));
        ContinuationWebSocketFrame frame2 = new ContinuationWebSocketFrame(false,
                                                                           WebSocketExtension.RSV3,
                                                                           Unpooled.wrappedBuffer(payload2));
        ContinuationWebSocketFrame frame3 = new ContinuationWebSocketFrame(true,
                                                                           WebSocketExtension.RSV3,
                                                                           Unpooled.wrappedBuffer(payload3));

        // execute
        assertTrue(encoderChannel.writeOutbound(frame1));
        assertTrue(encoderChannel.writeOutbound(frame2));
        assertTrue(encoderChannel.writeOutbound(frame3));
        BinaryWebSocketFrame compressedFrame1 = encoderChannel.readOutbound();
        ContinuationWebSocketFrame compressedFrame2 = encoderChannel.readOutbound();
        ContinuationWebSocketFrame compressedFrame3 = encoderChannel.readOutbound();

        // test
        assertNotNull(compressedFrame1);
        assertNotNull(compressedFrame2);
        assertNotNull(compressedFrame3);
        assertEquals(WebSocketExtension.RSV1 | WebSocketExtension.RSV3, compressedFrame1.rsv());
        assertEquals(WebSocketExtension.RSV3, compressedFrame2.rsv());
        assertEquals(WebSocketExtension.RSV3, compressedFrame3.rsv());
        assertFalse(compressedFrame1.isFinalFragment());
        assertFalse(compressedFrame2.isFinalFragment());
        assertTrue(compressedFrame3.isFinalFragment());

        assertTrue(decoderChannel.writeInbound(compressedFrame1.content()));
        ByteBuf uncompressedPayload1 = decoderChannel.readInbound();
        byte[] finalPayload1 = new byte[100];
        uncompressedPayload1.readBytes(finalPayload1);
        assertArrayEquals(finalPayload1, payload1);
        uncompressedPayload1.release();

        assertTrue(decoderChannel.writeInbound(compressedFrame2.content()));
        ByteBuf uncompressedPayload2 = decoderChannel.readInbound();
        byte[] finalPayload2 = new byte[100];
        uncompressedPayload2.readBytes(finalPayload2);
        assertArrayEquals(finalPayload2, payload2);
        uncompressedPayload2.release();

        assertTrue(decoderChannel.writeInbound(compressedFrame3.content()));
        assertTrue(decoderChannel.writeInbound(DeflateDecoder.FRAME_TAIL.duplicate()));
        ByteBuf uncompressedPayload3 = decoderChannel.readInbound();
        byte[] finalPayload3 = new byte[100];
        uncompressedPayload3.readBytes(finalPayload3);
        assertArrayEquals(finalPayload3, payload3);
        uncompressedPayload3.release();
    }