Fixed #8936 -- Added a view permission and a read-only admin.

Co-authored-by: Petr Dlouhy <petr.dlouhy@email.cz>
Co-authored-by: Olivier Dalang <olivier.dalang@gmail.com>

tests/admin_changelist/test_date_hierarchy.py

@@ -1,6 +1,7 @@
 from datetime import datetime
 
 from django.contrib.admin.options import IncorrectLookupParameters
+from django.contrib.auth.models import User
 from django.test import RequestFactory, TestCase
 from django.utils.timezone import make_aware
 
@@ -11,9 +12,14 @@ from .models import Event
 class DateHierarchyTests(TestCase):
     factory = RequestFactory()
 
+    @classmethod
+    def setUpTestData(cls):
+        cls.superuser = User.objects.create_superuser(username='super', email='a@b.com', password='xxx')
+
     def assertDateParams(self, query, expected_from_date, expected_to_date):
         query = {'date__%s' % field: val for field, val in query.items()}
         request = self.factory.get('/', query)
+        request.user = self.superuser
         changelist = EventAdmin(Event, custom_site).get_changelist_instance(request)
         _, _, lookup_params, _ = changelist.get_filters(request)
         self.assertEqual(lookup_params['date__gte'], expected_from_date)