code: def test_empty_document():
      document = build_document()
      summarizer = ReductionSummarizer(Stemmer("english"))
  
      returned = summarizer(document, 10)
      assert len(returned) == 0
  
file_path: sumy/tests/test_summarizers/test_reduction.py
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  from sumy.summarizers.reduction import ReductionSummarizer
  from sumy.nlp.stemmers import Stemmer
  from sumy._compat import to_unicode
  from ..utils import build_document
label_desc: Use image node_id 1 for calling a global function with example usage: test_empty_document() without return types