code: def test_cache_get_with_data_source_fallback():
      my_cache = cache.LRUCache[int, Union[int, str]](
          max_cache_items=5,
          expiration_horizon=datetime.timedelta(hours=1),
          retrieval_function=retrieval_function,
      )
  
      for i in range(10):
          val = my_cache.get(i)
          assert val == (retrieval_function(key=i), False)
  
      assert len(my_cache) == 5
  
file_path: sagemaker-python-sdk/tests/unit/sagemaker/utilities/test_cache.py
imports: from __future__ import absolute_import
  from typing import Optional, Union
  from mock.mock import MagicMock, patch
  import pytest
  from sagemaker.utilities import cache
  import datetime
label_desc: Use image node_id 6 for calling a global function with example usage: test_cache_get_with_data_source_fallback() without return types