old_contents: from __future__ import absolute_import
  
  from . import CommentTestCase
  
  
  class CommentFeedTests(CommentTestCase):
      urls = 'regressiontests.comment_tests.urls'
      feed_url = '/rss/comments/'
  
      def test_feed(self):
          response = self.client.get(self.feed_url)
          self.assertEqual(response.status_code, 200)
          self.assertEqual(response['Content-Type'], 'application/rss+xml')
          self.assertContains(response, '<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">')
          self.assertContains(response, '<title>example.com comments</title>')
          self.assertContains(response, '<link>http://example.com/</link>')
          self.assertContains(response, '</rss>')
  
new_contents: from __future__ import absolute_import
  
  from . import CommentTestCase
  
  
  class CommentFeedTests(CommentTestCase):
      urls = 'regressiontests.comment_tests.urls'
      feed_url = '/rss/comments/'
  
      def test_feed(self):
          response = self.client.get(self.feed_url)
          self.assertEqual(response.status_code, 200)
          self.assertEqual(response['Content-Type'], 'application/rss+xml; charset=utf-8')
          self.assertContains(response, '<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">')
          self.assertContains(response, '<title>example.com comments</title>')
          self.assertContains(response, '<link>http://example.com/</link>')
          self.assertContains(response, '</rss>')
  
subject: Fix the other test for #15237.