Refs #25050 -- Corrected test assertion in serializers test.

        author = Author.objects.defer('name').get(pk=author.pk)

        serial_str = serializers.serialize(self.serializer_name, [author])

        deserial_objs = list(serializers.deserialize(self.serializer_name, serial_str))

        self.assertIsInstance(deserial_objs[0].object, Author)

        # Check the class instead of using isinstance() because model instances

        # with deferred fields (e.g. Author_Deferred_name) will pass isinstance.

        self.assertEqual(deserial_objs[0].object.__class__, Author)

    def test_custom_field_serialization(self):

        """Tests that custom fields serialize and deserialize intact"""