code: def test_getClientIds(self):
      expectedClientIds = ["client_id_1"]
      clientIds = self.imageDataExtractor.getClientIds()
      self.assertEqual(len(expectedClientIds), len(clientIds))
      containsClients = all(id in clientIds for id in expectedClientIds)
      self.assertEqual(True, containsClients)
  
imports: import sys
  import unittest
  from typing import Dict, List
  from MONAILabelReviewerLib.ImageData import ImageData
  from MONAILabelReviewerLib.ImageDataExtractor import ImageDataExtractor
  from MONAILabelReviewerLib.MONAILabelReviewerEnum import Level, SegStatus
label_desc: Use image node_id 6 for calling the ImageDataExtractorTest obj's underlying member method code with example usage: obj.test_getClientIds() without return types