code: def test_tokenize_unit(raw_input):
      tu = units.Tokenize()
      out = tu.transform(raw_input)
      assert len(out) == 13
      assert "an" in out
  
imports: import pytest
  import numpy
  from matchzoo.preprocessors import units
  import matchzoo
  import tempfile
  import os
label_desc: Use image node_id 4 for calling a global function with example usage: test_tokenize_unit(raw_input) without return types