code: def test_charlm_cache():
      models_path = os.path.join(
          TEST_MODELS_DIR, "en", "backward_charlm", "*"
      )
      models = glob.glob(models_path)
      # we expect at least one English model downloaded for the tests
      assert len(models) >= 1
      model_file = models[0]
  
      cache = FoundationCache()
      with tempfile.TemporaryDirectory(dir=".") as test_dir:
          temp_file = os.path.join(test_dir, "charlm.pt")
          shutil.copy2(model_file, temp_file)
          # this will work
          model = load_charlm(temp_file)
  
          # this will save the model
          model = cache.load_charlm(temp_file)
  
      # this should no longer work
      with pytest.raises(FileNotFoundError):
          model = load_charlm(temp_file)
  
      # it should remember the cached version
      model = cache.load_charlm(temp_file)
  
file_path: stanza/stanza/tests/common/test_foundation_cache.py
imports: import glob
  import os
  import shutil
  import tempfile
  import pytest
  import stanza
  from stanza.models.common.foundation_cache import FoundationCache, load_charlm
  from stanza.tests import TEST_MODELS_DIR
label_desc: Use image node_id 1 for calling a global function with example usage: test_charlm_cache() without return types