old_contents: from __future__ import absolute_import, unicode_literals
  
  import unittest
  
  import mock
  
  import pykka
  
  from mopidy.core import Core
  from mopidy.internal import versioning
  
  
  class CoreActorTest(unittest.TestCase):
  
      def setUp(self):  # noqa: N802
          self.backend1 = mock.Mock()
          self.backend1.uri_schemes.get.return_value = ['dummy1']
          self.backend1.actor_ref.actor_class.__name__ = b'B1'
  
          self.backend2 = mock.Mock()
          self.backend2.uri_schemes.get.return_value = ['dummy2']
          self.backend2.actor_ref.actor_class.__name__ = b'B2'
  
          self.core = Core(mixer=None, backends=[self.backend1, self.backend2])
  
      def tearDown(self):  # noqa: N802
          pykka.ActorRegistry.stop_all()
  
      def test_uri_schemes_has_uris_from_all_backends(self):
          result = self.core.uri_schemes
  
          self.assertIn('dummy1', result)
          self.assertIn('dummy2', result)
  
      def test_backends_with_colliding_uri_schemes_fails(self):
          self.backend2.uri_schemes.get.return_value = ['dummy1', 'dummy2']
  
          self.assertRaisesRegexp(
              AssertionError,
              'Cannot add URI scheme dummy1 for B2, it is already handled by B1',
              Core, mixer=None, backends=[self.backend1, self.backend2])
  
      def test_version(self):
          self.assertEqual(self.core.version, versioning.get_version())
  
new_contents: from __future__ import absolute_import, unicode_literals
  
  import unittest
  
  import mock
  
  import pykka
  
  from mopidy.core import Core
  from mopidy.internal import versioning
  
  
  class CoreActorTest(unittest.TestCase):
  
      def setUp(self):  # noqa: N802
          self.backend1 = mock.Mock()
          self.backend1.uri_schemes.get.return_value = ['dummy1']
          self.backend1.actor_ref.actor_class.__name__ = b'B1'
  
          self.backend2 = mock.Mock()
          self.backend2.uri_schemes.get.return_value = ['dummy2']
          self.backend2.actor_ref.actor_class.__name__ = b'B2'
  
          self.core = Core(mixer=None, backends=[self.backend1, self.backend2])
  
      def tearDown(self):  # noqa: N802
          pykka.ActorRegistry.stop_all()
  
      def test_uri_schemes_has_uris_from_all_backends(self):
          result = self.core.uri_schemes
  
          self.assertIn('dummy1', result)
          self.assertIn('dummy2', result)
  
      def test_backends_with_colliding_uri_schemes_fails(self):
          self.backend2.uri_schemes.get.return_value = ['dummy1', 'dummy2']
  
          self.assertRaisesRegexp(
              AssertionError,
              'Cannot add URI scheme "dummy1" for B2, '
              'it is already handled by B1',
              Core, mixer=None, backends=[self.backend1, self.backend2])
  
      def test_version(self):
          self.assertEqual(self.core.version, versioning.get_version())
  
subject: Update test