title: Unit testing of SimpleChannelInboundHandler<FullHTTPRequest> in netty
body: <p>I am new to netty framework.We have a API Handler implementing SimpleChannelInboundHandler and overriding the ChannelRead0 function that takes ChannelHandlerContext and the FullHTTPRequest.Now I need to do unit testing mocking the inputs.
  Can anyone help me with this.</p>