code: def test_isFlagged_when_segmentation_is_flagged(self):
      isFlagged = self.imageData.isFlagged("version_1")
      self.assertTrue(isFlagged)
  
imports: import json
  import os
  import sys
  import unittest
  from MONAILabelReviewerLib.ImageData import ImageData
  from MONAILabelReviewerLib.JsonParser import JsonParser
  from MONAILabelReviewerLib.SegmentationMeta import SegmentationMeta
label_desc: Use image node_id 21 for calling the ImageDataTest obj's underlying member method code with example usage: obj.test_isFlagged_when_segmentation_is_flagged() without return types