code: def test_check_integrity(self):
      file, md5 = self.file1
      self.assertTrue(check_integrity(file, md5))
      file, md5 = self.file2
      self.assertFalse(check_integrity(file, md5))
      self.assertTrue(check_integrity(file, None))
      file, md5 = self.file3
      self.assertFalse(check_integrity(file, md5))
  
imports: import json
  import os
  import tempfile
  import unittest
  from mmocr.utils import check_integrity, get_md5, is_archive, list_files, list_from_file, list_to_file
label_desc: Use image node_id 2 for calling the TestCheckIntegrity obj's underlying member method code with example usage: obj.test_check_integrity() without return types