docstr: Test that the database maintains a valid format
  when data is added and updated. This means that
  after the training process, the database should
  contain nine objects and eight of these objects
  should list the previous member of the list as
  a response.
docstr_tok: ["Test","that","the","database","maintains","a","valid","format","when","data","is","added","and","updated",".","This","means","that","after","the","training","process",",","the","database","should","contain","nine","objects","and","eight","of","these","objects","should","list","the","previous","member","of","the","list","as","a","response","."]
code: def test_database_has_correct_format(self):
      """
      Test that the database maintains a valid format
      when data is added and updated. This means that
      after the training process, the database should
      contain nine objects and eight of these objects
      should list the previous member of the list as
      a response.
      """
      conversation = [
          "Hello sir!",
          "Hi, can I help you?",
          "Yes, I am looking for italian parsely.",
          "Italian parsely is right over here in out produce department",
          "Great, thank you for your help.",
          "No problem, did you need help finding anything else?",
          "Nope, that was it.",
          "Alright, have a great day.",
          "Thanks, you too.",
      ]
  
      self.trainer.train(conversation)
  
      # There should be a total of 9 statements in the database after training
      self.assertEqual(self.chatbot.storage.count(), 9)
  
      # The first statement should be in response to another statement
      first_statement = list(
          self.chatbot.storage.filter(text=conversation[0])
      )
      self.assertIsNone(first_statement[0].in_response_to)
  
      # The second statement should be in response to the first statement
      second_statement = list(
          self.chatbot.storage.filter(text=conversation[1])
      )
      self.assertEqual(
          second_statement[0].in_response_to, conversation[0]
      )
  
imports: from tests.base_case import ChatBotTestCase
  from chatterbot.trainers import ListTrainer
  from chatterbot import preprocessors
label_desc: Use image node_id 7 for calling the ListTrainingTests obj's underlying member method code with example usage: obj.test_database_has_correct_format() without return types