Major Description
Currently there is no simple way to generate a request and validate we receive a response without adding a lot of dependencies for the test.
Kafka request classes have quite a few dependencies, so they are not really usable when testing infrastructure components or clients.
Generating a byte-array with meaningless request key id as it is done in SocketServerTest results in unknown request exception that must be handled.
I suggest adding an EchoRequest, EchoResponse and EchoHandler. The Request will be the usual header and a bytearray. The Response will be a response header and the same bytearray echoed back.
Should be useful for client developers and when testing infrastructure changes.