code: def test_cache_does_not_exist(self, mock_exists: Any) -> None:
      expected_failing_test_files: Set[str] = set()
  
      found_tests = get_previous_failures()
  
      self.assertSetEqual(expected_failing_test_files, found_tests)
  
imports: import io
  import json
  import pathlib
  import sys
  import unittest
  from typing import Any, Dict, Set
  from unittest import mock
label_desc: Use image node_id 1 for calling the TestParsePrevTests obj's underlying member method code with example usage: obj.test_cache_does_not_exist(mock_exists) without return types