old_contents: # -*- coding: utf-8 -*
  from __future__ import absolute_import, unicode_literals
  
  import warnings
  
  from django.test import SimpleTestCase
  
  from wagtail.utils.deprecation import RemovedInWagtail17Warning, SearchFieldsShouldBeAList
  
  
  class TestThisShouldBeAList(SimpleTestCase):
      def test_add_a_list(self):
          with warnings.catch_warnings(record=True) as w:
              base = SearchFieldsShouldBeAList(['hello'])
              result = base + ['world']
  
              # Ensure that adding things together works
              self.assertEqual(result, ['hello', 'world'])
              # Ensure that a new SearchFieldsShouldBeAList was returned
              self.assertIsInstance(result, SearchFieldsShouldBeAList)
              # Check that no deprecation warnings were raised
              self.assertEqual(len(w), 0)
  
      def test_add_a_tuple(self):
          with warnings.catch_warnings(record=True) as w:
              base = SearchFieldsShouldBeAList(['hello'])
              result = base + ('world',)
  
              # Ensure that adding things together works
              self.assertEqual(result, ['hello', 'world'])
              # Ensure that a new SearchFieldsShouldBeAList was returned
              self.assertIsInstance(result, SearchFieldsShouldBeAList)
              # Check that a deprecation warning was raised
              self.assertEqual(len(w), 1)
              warning = w[0]
              self.assertIs(warning.category, RemovedInWagtail17Warning)
  
new_contents: # -*- coding: utf-8 -*
  from __future__ import absolute_import, unicode_literals
  
  import warnings
  
  from django.test import SimpleTestCase
  
  from wagtail.utils.deprecation import RemovedInWagtail17Warning, SearchFieldsShouldBeAList
  
  
  class TestThisShouldBeAList(SimpleTestCase):
      def test_add_a_list(self):
          with warnings.catch_warnings(record=True) as w:
              warnings.simplefilter('always')
  
              base = SearchFieldsShouldBeAList(['hello'])
              result = base + ['world']
  
              # Ensure that adding things together works
              self.assertEqual(result, ['hello', 'world'])
              # Ensure that a new SearchFieldsShouldBeAList was returned
              self.assertIsInstance(result, SearchFieldsShouldBeAList)
              # Check that no deprecation warnings were raised
              self.assertEqual(len(w), 0)
  
      def test_add_a_tuple(self):
          with warnings.catch_warnings(record=True) as w:
              warnings.simplefilter('always')
  
              base = SearchFieldsShouldBeAList(['hello'])
              result = base + ('world',)
  
              # Ensure that adding things together works
              self.assertEqual(result, ['hello', 'world'])
              # Ensure that a new SearchFieldsShouldBeAList was returned
              self.assertIsInstance(result, SearchFieldsShouldBeAList)
              # Check that a deprecation warning was raised
              self.assertEqual(len(w), 1)
              warning = w[0]
              self.assertIs(warning.category, RemovedInWagtail17Warning)
  
subject: Reset warnings before testing warnings