code: def test_get_class_url(self):
      cls_url = py_utils.get_class_url(py_utils.NonMutableDict)
      self.assertEqual(
          cls_url,
          (
              constants.SRC_BASE_URL
              + "tensorflow_datasets/core/utils/py_utils.py"
          ),
      )
  
imports: import collections
  import pathlib
  from etils import epath
  import pytest
  import tensorflow
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import constants
  from tensorflow_datasets.core import utils
  from tensorflow_datasets.core.utils import py_utils
label_desc: Use image node_id 2 for calling the GetClassPathUrlTest obj's underlying member method code with example usage: obj.test_get_class_url() without return types