code: def test_news_fileids(self):
      self.assertEqual(
          ptb.fileids("news")[:3],
          [
              "WSJ/00/WSJ_0001.MRG",
              "WSJ/00/WSJ_0002.MRG",
              "WSJ/00/WSJ_0003.MRG",
          ],
      )
  
imports: import unittest
  import pytest
  from nltk.corpus import cess_cat, cess_esp, conll2007, floresta, indian, ptb, sinica_treebank, udhr
  from nltk.tree import Tree
label_desc: Use image node_id 5 for calling the TestPTB obj's underlying member method code with example usage: obj.test_news_fileids() without return types