protected void doProcess(Buffer buffer, int length, int type, int id) throws IOException {
            int originalBufferPosition = buffer.rpos()

            int pos = buffer.rpos()
            def command = commandMessage(buffer, type)
            buffer.rpos(pos)

            def matched = expectations.find { it.matches(buffer, type, id) }
            if (matched) {
                if (matched.failing) {