code: def test_downgrading_file_test(self) -> None:
      tests = ["test1", "test2", "test3", "test4"]
  
      heuristic1 = TestPrioritizations(
          tests_being_ranked=tests,
          probable_relevance=["test2", "test3"],
      )
  
      heuristic2 = TestPrioritizations(
          tests_being_ranked=tests,
          no_relevance=["test2"],
      )
  
      expected_prioritizations = TestPrioritizations(
          tests_being_ranked=tests,
          probable_relevance=["test3"],
          unranked_relevance=["test1", "test4"],
          no_relevance=["test2"],
      )
  
      aggregator = AggregatedHeuristics(unranked_tests=tests)
      aggregator.add_heuristic_results(HEURISTICS[0], heuristic1)
      aggregator.add_heuristic_results(HEURISTICS[1], heuristic2)
  
      aggregated_pris = aggregator.get_aggregated_priorities()
  
      self.assertHeuristicsMatch(
          aggregated_pris,
          expected_prioritizations=expected_prioritizations,
      )
  
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 2 for calling the TestAggregatedHeuristics obj's underlying member method code with example usage: obj.test_downgrading_file_test() without return types