code: def test_missing_stemmer_language():
      with pytest.raises(LookupError):
          Stemmer("klingon")
  
file_path: sumy/tests/test_stemmers.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import pytest
  from sumy.nlp.stemmers import null_stemmer, Stemmer
label_desc: Use image node_id 1 for calling a global function with example usage: test_missing_stemmer_language() without return types