docs: @Setup(Level.Trial)
    public void setup() throws Exception {
      super.setup(clientExecutor,
          ExecutorType.DIRECT,
          MessageSize.SMALL,
          responseSize,
          FlowWindowSize.MEDIUM,
          ChannelType.NIO,
          maxConcurrentStreams,
          channelCount);
      callCounter = new AtomicLong();
      completed = new AtomicBoolean();
      record = new AtomicBoolean();
      latch =
          startFlowControlledStreamingCalls(maxConcurrentStreams, callCounter, record, completed, 1);
    }