code: def test_parse_sentence(self):
      parsed = self.extractor._parse_sentence(self.sentence)
      assert_true(isinstance(parsed, nltk.tree.Tree))
  
file_path: TextBlob/tests/test_np_extractor.py
imports: from __future__ import unicode_literals
  import unittest
  from nose.tools import *
  from nose.plugins.attrib import attr
  import nltk
  from textblob.base import BaseNPExtractor
  from textblob.np_extractors import ConllExtractor
  from textblob.utils import filter_insignificant
label_desc: Use image node_id 3 for calling the TestConllExtractor obj's underlying member method code with example usage: obj.test_parse_sentence() without return types