code: def test_augment_comma_separations():
      doc = read_test_doc(COMMA_SEP_TEST_CASE)
      doc2 = prepare_tokenizer_treebank.augment_comma_separations(
          doc, ratio=1.0
      )
  
      assert len(doc2) == 2
      expected = read_test_doc(COMMA_SEP_TEST_EXPECTED)
      assert doc2[1] == expected[0]
  
file_path: stanza/stanza/tests/tokenization/test_prepare_tokenizer_treebank.py
imports: import pytest
  import stanza
  from stanza.tests import *
  from stanza.utils.datasets import prepare_tokenizer_treebank
label_desc: Use image node_id 9 for calling a global function with example usage: test_augment_comma_separations() without return types