code: def test_lemma_unit(list_input):
      lemma = units.Lemmatization()
      out = lemma.transform(list_input)
      assert "this" in out
  
imports: import pytest
  import numpy
  from matchzoo.preprocessors import units
  import matchzoo
  import tempfile
  import os
label_desc: Use image node_id 10 for calling a global function with example usage: test_lemma_unit(list_input) without return types