IoBuffer buffer = IoBuffer.allocate(1000);
buffer.putString("AB12C", Charset.defaultCharset().newEncoder());
buffer.flip();
DemuxingProtocolDecoder decoder = new DemuxingProtocolDecoder();
decoder.addMessageDecoder(CharacterMessageDecoder.class);
decoder.addMessageDecoder(IntegerMessageDecoder.class);
decoder.decode(session, buffer, mock);
EasyMock.verify(mock);