.setService(SudokuService.getDescriptor().getFullName())
.setMethod("Solve")
.setRequest(sudokuRequest.toByteString())
.build();
channel.messageReceived(null, new UpstreamMessageEvent(mockChannel, request, null));
assertEquals(sudokuRequest, gotRequest);
RpcMessage response = RpcMessage.newBuilder()
.setType(MessageType.RESPONSE)
.setId(2)