private void setUpServerChannel() {
    frameListener = mock(Http2FrameListener.class);

    http2ConnectionHandler = new Http2ConnectionHandlerBuilder()
            .frameListener(frameListener).build();

    UpgradeCodecFactory upgradeCodecFactory = new UpgradeCodecFactory() {
        @Override
        public UpgradeCodec newUpgradeCodec(CharSequence protocol) {
            return new Http2ServerUpgradeCodec(http2ConnectionHandler);
        }
    };

    userEvents = new ArrayList<Object>();

    HttpServerCodec httpServerCodec = new HttpServerCodec();
    HttpServerUpgradeHandler upgradeHandler = new HttpServerUpgradeHandler(httpServerCodec, upgradeCodecFactory);

    CleartextHttp2ServerUpgradeHandler handler = new CleartextHttp2ServerUpgradeHandler(
            httpServerCodec, upgradeHandler, http2ConnectionHandler);
    channel = new EmbeddedChannel(handler, new ChannelInboundHandlerAdapter() {
        @Override
        public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
            userEvents.add(evt);
        }
    });
}
 

@Test
public void usedHttp2MultiplexCodec() throws Exception {
    final Http2MultiplexCodec http2Codec = new Http2MultiplexCodecBuilder(true, new ChannelInitializer<Channel>() {
        @Override
        protected void initChannel(Channel ch) throws Exception {
        }
    }).build();
    UpgradeCodecFactory upgradeCodecFactory = new UpgradeCodecFactory() {
        @Override
        public UpgradeCodec newUpgradeCodec(CharSequence protocol) {
            return new Http2ServerUpgradeCodec(http2Codec);
        }
    };
    http2ConnectionHandler = http2Codec;

    userEvents = new ArrayList<Object>();

    HttpServerCodec httpServerCodec = new HttpServerCodec();
    HttpServerUpgradeHandler upgradeHandler = new HttpServerUpgradeHandler(httpServerCodec, upgradeCodecFactory);

    CleartextHttp2ServerUpgradeHandler handler = new CleartextHttp2ServerUpgradeHandler(
            httpServerCodec, upgradeHandler, http2Codec);
    channel = new EmbeddedChannel(handler, new ChannelInboundHandlerAdapter() {
        @Override
        public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
            userEvents.add(evt);
        }
    });

    assertFalse(channel.writeInbound(Http2CodecUtil.connectionPrefaceBuf()));

    ByteBuf settingsFrame = settingsFrameBuf();

    assertTrue(channel.writeInbound(settingsFrame));

    assertEquals(1, userEvents.size());
    assertTrue(userEvents.get(0) instanceof PriorKnowledgeUpgradeEvent);
}