old_contents: from django.test import TestCase
  
  from chatwork.utils import send_chatwork
  
  
  class SendChatworkTests(TestCase):
      def test_send_chatwork(self):
          response = send_chatwork('test', 1234)
          self.assertEqual(response, {'message_id': '1234'})
  
new_contents: from django.test import TestCase
  
  from chatwork.utils import send_chatwork, create_task
  
  
  class SendChatworkTests(TestCase):
      def test_send_chatwork(self):
          response = send_chatwork('test', 1234)
          self.assertEqual(response, {'message_id': '1234'})
  
  
  class CreateTaskTests(TestCase):
      def test_create_task(self):
          response = create_task('test', 1234, [123, 124])
          self.assertEqual(response, {'task_ids': [123, 124]})
  
subject: test for create_task