code: def flow_tester():
      def make_tester(high=None, mid=None, low=None):
          ft = FlowTester(high=high, mid=mid, low=low)
          return ft
  
      yield make_tester
  
imports: import json
  import time
  from dataclasses import dataclass
  from enum import Enum
  import pytest
  from wandb.proto import wandb_internal_pb2
  from wandb.sdk.internal import flow_control, settings_static
  from wandb.sdk.lib import proto_util
  from wandb.sdk.wandb_settings import Settings
label_desc: Use image node_id 1 for calling a global function with example usage: flow_tester() and returns: ft