old_contents: import unittest
  import importlib_resources as resources
  
  from . import data01
  from . import util
  
  
  class ContentsTests:
      @property
      def contents(self):
          return sorted(
              [el for el in list(resources.contents(self.data)) if el != '__pycache__']
          )
  
  
  class ContentsDiskTests(ContentsTests, unittest.TestCase):
      def setUp(self):
          self.data = data01
  
      def test_contents(self):
          self.assertEqual(
              self.contents,
              [
                  '__init__.py',
                  'binary.file',
                  'subdirectory',
                  'utf-16.file',
                  'utf-8.file',
              ],
          )
  
  
  class ContentsZipTests(ContentsTests, util.ZipSetup, unittest.TestCase):
      def test_contents(self):
          self.assertEqual(
              self.contents,
              [
                  '__init__.py',
                  'binary.file',
                  'subdirectory',
                  'utf-16.file',
                  'utf-8.file',
              ],
          )
  
  
  class ContentsNamespaceTests(ContentsTests, unittest.TestCase):
      def setUp(self):
          from . import namespacedata01
  
          self.data = namespacedata01
  
      def test_contents(self):
          self.assertEqual(
              self.contents,
              [
                  'binary.file',
                  'utf-16.file',
                  'utf-8.file',
              ],
          )
  
new_contents: import unittest
  import importlib_resources as resources
  
  from . import data01
  from . import util
  
  
  class ContentsTests:
      expected = {
          '__init__.py',
          'binary.file',
          'subdirectory',
          'utf-16.file',
          'utf-8.file',
      }
  
      def test_contents(self):
          assert self.expected <= set(resources.contents(self.data))
  
  
  class ContentsDiskTests(ContentsTests, unittest.TestCase):
      def setUp(self):
          self.data = data01
  
  
  class ContentsZipTests(ContentsTests, util.ZipSetup, unittest.TestCase):
      pass
  
  
  class ContentsNamespaceTests(ContentsTests, unittest.TestCase):
      expected = {
          # no __init__ because of namespace design
          # no subdirectory as incidental difference in fixture
          'binary.file',
          'utf-16.file',
          'utf-8.file',
      }
  
      def setUp(self):
          from . import namespacedata01
  
          self.data = namespacedata01
  
subject: Consolidate some behavior and re-use 'set' comparison for less strict unordered comparisons.