code: def loadJsonStr(cls, fileName: str) -> str:
      with open(
          os.path.join(sys.path[0], "TestDataSet/" + fileName)
      ) as f:
          data = json.dumps(json.load(f))
      return data
  
imports: import json
  import logging
  import os
  import sys
  import time
  import unittest
  import requests
  from mockserver_friendly import MockServerFriendlyClient, json_equals, request, response, times
  from python_on_whales import docker
  from MONAILabelReviewerLib.MonaiServerREST import MonaiServerREST
label_desc: Use image node_id 3 for calling the MonaiServerRESTTest obj's underlying member method code with example usage: obj.loadJsonStr(cls, fileName) and returns: data