code: def test_filter_insignificant(self):
      chunk = self.extractor._parse_sentence(self.sentence)
      tags = [tag for word, tag in chunk.leaves()]
      assert_true("DT" in tags)
      filtered = filter_insignificant(chunk.leaves())
      tags = [tag for word, tag in filtered]
      assert_true("DT" not in tags)
  
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 4 for calling the TestConllExtractor obj's underlying member method code with example usage: obj.test_filter_insignificant() without return types