code: def test_none_ds(self):
      ds = tf.data.Dataset.range(10)
      ds = ds.map(lambda x: (x, None))
      exs = list(dataset_utils.as_numpy(ds))
      self.assertAllEqual(exs, [(x, None) for x in range(10)])
  
imports: from etils import enp
  import numpy
  import tensorflow
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import dataset_utils
label_desc: Use image node_id 12 for calling the DatasetAsNumPyTest obj's underlying member method code with example usage: obj.test_none_ds() without return types