code: def test_convert_config_name():
      assert (
          huggingface_dataset_builder.convert_config_name(None) is None
      )
      assert huggingface_dataset_builder.convert_config_name("x") == "x"
      assert huggingface_dataset_builder.convert_config_name("X") == "x"
      assert (
          huggingface_dataset_builder.convert_config_name("X,y")
          == "x_y"
      )
  
imports: import datetime
  from unittest import mock
  from absl import logging
  import numpy
  import pytest
  import tensorflow
  from tensorflow_datasets.core import features
  from tensorflow_datasets.core import lazy_imports_lib
  from tensorflow_datasets.core import registered
  from tensorflow_datasets.core.dataset_builders import huggingface_dataset_builder
label_desc: Use image node_id 3 for calling a global function with example usage: test_convert_config_name() without return types