old_contents: from app.test_base import BaseTestCase
  
  class TestTopLevelFunctions(BaseTestCase):
      def test_index_response(self):
          response = self.client.get('/')
          self.assertEqual(response.status_code, 200)
new_contents: from app.test_base import BaseTestCase
  
  class TestTopLevelFunctions(BaseTestCase):
      def test_index_response(self):
          response = self.client.get('/')
          self.assert200(response)
  
subject: Leverage flask-testing assert200