code: def test_checksum_string(self):
      def _make_hash():
          return dataset_builder_testing.checksum(
              tf.constant([b"foo", b"bar-obj"]).numpy()
          )
  
      # Ensure determinism by checking the hash is the same across examples
      # Could harcode value instead but hash is different between Py2 and 3.
      self.assertLen(set(_make_hash() for _ in range(5)), 1)
  
imports: import tensorflow
  from tensorflow_datasets import testing
  from tensorflow_datasets.testing import dataset_builder_testing
label_desc: Use image node_id 1 for calling the DatasetBuilderTesting obj's underlying member method code with example usage: obj.test_checksum_string() and returns: dataset_builder_testing