code: def test_get_tokens():
      sentence = "I am happy"
      tokens = ["i", "am", "happy"]
      assert tokens == _get_tokens(sentence)
  
      sentence = "I am a person"
      tokens = ["i", "am", "person"]
      assert tokens == _get_tokens(sentence)
  
      sentence = "I am a person."
      tokens = ["i", "am", "person"]
      assert tokens == _get_tokens(sentence)
  
file_path: NeMo/tests/collections/nlp/test_question_answering.py
imports: import collections
  from pydoc import doc
  import pytest
  from nemo.collections.nlp.data.question_answering_squad.qa_dataset import SquadDataset
  from nemo.collections.nlp.data.question_answering_squad.qa_squad_processing import _get_tokens, exact_match_score, f1_score
label_desc: Use image node_id 1 for calling a global function with example usage: test_get_tokens() without return types