Remove usage of deprecated Django APIs

src/tests/api/test_checkin.py

@@ -23,8 +23,6 @@ import datetime
 import time
 from decimal import Decimal
 from unittest import mock
-# deprecated: from django.utils.http import urlquote
-# use urlib instead
 from urllib.parse import quote as urlquote
 
 import pytest

src/tests/testdummy/__init__.py

@@ -19,19 +19,3 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
-from django.apps import AppConfig
-
-
-class TestDummyApp(AppConfig):
-    name = 'tests.testdummy'
-    verbose_name = '.testdummy'
-
-    class PretixPluginMeta:
-        name = '.testdummy'
-        version = '1.0.0'
-
-    def ready(self):
-        from tests.testdummy import signals  # noqa
-
-
-default_app_config = 'tests.testdummy.TestDummyApp'

src/tests/testdummy/apps.py

@@ -0,0 +1,34 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from django.apps import AppConfig
+
+
+class TestDummyApp(AppConfig):
+    name = 'tests.testdummy'
+    verbose_name = '.testdummy'
+
+    class PretixPluginMeta:
+        name = '.testdummy'
+        version = '1.0.0'
+
+    def ready(self):
+        from tests.testdummy import signals  # noqa