code: def test_getImageDataByLevel_level_hard(self):
      returnedImageDatas = self.imageDataExtractor.getImageDataByLevel(
          isEasy=False, isMedium=False, isHard=True
      )
      self.assertEqual(1, len(returnedImageDatas))
      returnedImageData = returnedImageDatas["imageId_1"]
      expectedImageData = self.nameToImageData["imageId_1"]
      self.assertEqual(
          True, self.areEqual(expectedImageData, returnedImageData)
      )
  
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 23 for calling the ImageDataExtractorTest obj's underlying member method code with example usage: obj.test_getImageDataByLevel_level_hard() without return types