code: def test_basic_f_score_equals():
      sentences = ("s1", "s2", "s3", "s4", "s5")
      result = f_score(sentences, sentences)
  
      assert result == approx(1.0)
  
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  import pytest
  from pytest import approx
  from sumy.evaluation import precision, recall, f_score
label_desc: Use image node_id 18 for calling a global function with example usage: test_basic_f_score_equals() without return types