old_contents: """Integration tests for Dynu.com"""
  from unittest import TestCase
  
  from lexicon.tests.providers.integration_tests import IntegrationTests
  
  
  # Hook into testing framework by inheriting unittest.TestCase and reuse
  # the tests which *each and every* implementation of the interface must
  # pass, by inheritance from integration_tests.IntegrationTests
  class DynuProviderTests(TestCase, IntegrationTests):
      """TestCase for Dynu.com"""
      provider_name = 'dynu'
      domain = 'example.com'
  
      def _filter_headers(self):
          return ['API-Key']
  
      def _filter_response(self, response):
          if response['status']['code'] not in [200, 503]:
              return None
          return response
  
new_contents: """Integration tests for Dynu.com"""
  from unittest import TestCase
  
  from lexicon.tests.providers.integration_tests import IntegrationTestsV2
  
  
  # Hook into testing framework by inheriting unittest.TestCase and reuse
  # the tests which *each and every* implementation of the interface must
  # pass, by inheritance from integration_tests.IntegrationTests
  class DynuProviderTests(TestCase, IntegrationTestsV2):
      """TestCase for Dynu.com"""
      provider_name = 'dynu'
      domain = 'example.com'
  
      def _filter_headers(self):
          return ['API-Key']
  
      def _filter_response(self, response):
          if response['status']['code'] not in [200, 503]:
              return None
          return response
  
subject: Fix tests