code: def test_char_span_to_token_span_handles_hard_cases(self):
      # An earlier version of the code had a hard time when the answer was the last token in the
      # passage.  This tests that case, on the instance that used to fail.
      tokenizer = WordTokenizer()
      passage = (
          "Beyonc\u00e9 is believed to have first started a relationship with Jay Z "
          + 'after a collaboration on "\'03 Bonnie & Clyde", which appeared on his seventh '
          + "album The Blueprint 2: The Gift & The Curse (2002). Beyonc\u00e9 appeared as Jay "
          + "Z's girlfriend in the music video for the song, which would further fuel "
          + "speculation of their relationship. On April 4, 2008, Beyonc\u00e9 and Jay Z were "
          + "married without publicity. As of April 2014, the couple have sold a combined 300 "
          + "million records together. The couple are known for their private relationship, "
          + "although they have appeared to become more relaxed in recent years. Beyonc\u00e9 "
          + 'suffered a miscarriage in 2010 or 2011, describing it as "the saddest thing" '
          + "she had ever endured. She returned to the studio and wrote music in order to cope "
          + "with the loss. In April 2011, Beyonc\u00e9 and Jay Z traveled to Paris in order "
          + "to shoot the album cover for her 4, and unexpectedly became pregnant in Paris."
      )
      start = 912
      end = 912 + len("Paris.")
      tokens = tokenizer.tokenize(passage)
      offsets = [(t.idx, t.idx + len(t.text)) for t in tokens]
      token_span = util.char_span_to_token_span(offsets, (start, end))[
          0
      ]
      assert token_span == (184, 185)
  
file_path: magnitude/pymagnitude/third_party/allennlp/tests/data/dataset_readers/reading_comprehension/util_test.py
imports: from __future__ import absolute_import
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data.dataset_readers.reading_comprehension import util
  from allennlp.data.tokenizers import WordTokenizer
label_desc: Use image node_id 2 for calling the TestReadingComprehensionUtil obj's underlying member method code with example usage: obj.test_char_span_to_token_span_handles_hard_cases() without return types