Fix DeprecationWarning about default_app_config in Django 3.2

CHANGELOG.rst

@@ -16,6 +16,7 @@ Added
 Fixes
 -----
 * Fix unicode sandwich issue in cas_server.utils.update_url
+* Fix DeprecationWarning about default_app_config in Django 3.2
 
 Removed
 -------

cas_server/__init__.py

@@ -9,9 +9,11 @@
 #
 # (c) 2015-2016 Valentin Samir
 """A django CAS server application"""
+import django
 
 #: version of the application
 VERSION = '1.3.1'
 
-#: path the the application configuration class
-default_app_config = 'cas_server.apps.CasAppConfig'
+if django.VERSION < (3, 2):
+    #: path the the application configuration class
+    default_app_config = 'cas_server.apps.CasAppConfig'

cas_server/tests/test_utils.py

@@ -10,6 +10,7 @@
 #
 # (c) 2016 Valentin Samir
 """Tests module for utils"""
+import django
 from django.test import TestCase, RequestFactory
 from django.db import connection
 
@@ -173,6 +174,7 @@ class UtilsTestCase(TestCase):
             utils.import_attr('cas_server.utils.toto')
         with self.assertRaises(ValueError):
             utils.import_attr('toto')
+        if django.VERSION < (3, 2):
             self.assertEqual(
                 utils.import_attr('cas_server.default_app_config'),
                 'cas_server.apps.CasAppConfig'