docstr: Test converting an AIS endpoint to dir.
          
docstr_tok: ["Test","converting","an","AIS","endpoint","to","dir","."]
code: def test_ais_endpoint_to_dir(self):
      """Test converting an AIS endpoint to dir."""
      assert ais_endpoint_to_dir("http://local:123") == os.path.join(
          "local", "123"
      )
      assert ais_endpoint_to_dir("http://1.2.3.4:567") == os.path.join(
          "1.2.3.4", "567"
      )
  
      with pytest.raises(ValueError):
          ais_endpoint_to_dir("local:123")
  
file_path: NeMo/tests/utils/test_utils.py
imports: import os
  from unittest import mock
  import pytest
  from nemo import __version__
  from nemo.utils.data_utils import ais_binary, ais_endpoint_to_dir, bucket_and_object_from_uri, datastore_path_to_webdataset_url, is_datastore_path, resolve_cache_dir
label_desc: Use image node_id 4 for calling the TestDataUtils obj's underlying member method code with example usage: obj.test_ais_endpoint_to_dir() without return types