code: def test_dataset_reference_get_split():
      reference = naming.DatasetReference.from_tfds_name(
          "ds/config:1.2.3", split_mapping={"x": "y"}
      )
      assert reference.get_split("x") == "y"
      assert reference.get_split("y") == "y"
      assert reference.get_split("z") == "z"
  
imports: import os
  from absl.testing import parameterized
  from etils import epath
  import pytest
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import naming
  from tensorflow_datasets.core import splits
label_desc: Use image node_id 41 for calling a global function with example usage: test_dataset_reference_get_split() without return types