text: from unittest import TestCase
  from collections import Counter
  
  from chai_py import  ChaiBot, TRoom
  
  from stateful_bot import StatefulBot
  
  class TestStatefulBot(TestCase):
  
      def test_initial_message(self):
  
          bot = StatefulBot()
          chat_room = TRoom([bot])
          messages = []
          chat_room.test_chat(messages)
          first_message = "Enter text to see the letter count: "
          self.assertEqual(first_message, chat_room.messages[-1].content)
  
      def test_count_one_message(self):
  
          bot = StatefulBot()
          chat_room = TRoom([bot])
          messages = ["one"]
          chat_room.test_chat(messages)
          self.assertEqual(Counter(['o', 'n', 'e']), bot.counter)
  
      def test_multiple_messages(self):
  
          bot = StatefulBot()
          chat_room = TRoom([bot])
          messages = ["one", "two"]
          chat_room.test_chat(messages)
          self.assertEqual(Counter([ 'o', 'n', 'e', 't', 'w', 'o']), bot.counter)
  
  