code: def test_null_words_property():
      summarizer = EdmundsonSummarizer()
  
      assert summarizer.null_words == frozenset()
  
      words = (
          "word",
          "another",
          "and",
          "some",
          "next",
      )
      summarizer.null_words = words
  
      assert summarizer.null_words == frozenset(words)
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import pytest
  from sumy._compat import to_unicode
  from sumy.summarizers.edmundson import EdmundsonSummarizer
  from ..utils import build_document, build_document_from_string
label_desc: Use image node_id 3 for calling a global function with example usage: test_null_words_property() without return types