code: def test_difficult_cases(self):
      # Don't see an obvious way of solving these. They require something more semantic to distinguish
      text = "is equivalent to (iv) of Theorem"
      doc = self.nlp(text)
      doc2 = self.detector(doc)
      assert len(doc2._.abbreviations) == 0
  
      text = "or to fork.Users work more on their repositories (owners) than on"
      doc = self.nlp(text)
      doc2 = self.detector(doc)
      assert len(doc2._.abbreviations) == 0
  
file_path: scispacy/tests/test_abbreviation_detection.py
imports: import unittest
  import spacy
  import pytest
  from scispacy.abbreviation import AbbreviationDetector, find_abbreviation, filter_matches
label_desc: Use image node_id 13 for calling the TestAbbreviationDetector obj's underlying member method code with example usage: obj.test_difficult_cases() without return types