class_docstr: Test the Ubuntu Corpus trainer class.
class_docstr_tok: ["Test","the","Ubuntu","Corpus","trainer","class","."]
docstr: Test the case that the url being downloaded does not exist.
docstr_tok: ["Test","the","case","that","the","url","being","downloaded","does","not","exist","."]
code: def test_download_url_not_found(self):
      """
      Test the case that the url being downloaded does not exist.
      """
      self.skipTest("This test needs to be created.")
  
imports: from unittest.mock import Mock
  from io import BytesIO
  import tarfile
  import os
  from tests.base_case import ChatBotTestCase
  from chatterbot.trainers import UbuntuCorpusTrainer
label_desc: Use image node_id 10 for calling the UbuntuCorpusTrainerTestCase obj's underlying member method code with example usage: obj.test_download_url_not_found() without return types