Fix deprecation warnings

src/pretix/presale/utils.py

@@ -100,7 +100,7 @@ def _detect_event(request, require_live=True, require_plugin=None):
 
         if hasattr(request, 'event'):
             # Restrict locales to the ones available for this event
-            LocaleMiddleware().process_request(request)
+            LocaleMiddleware(NotImplementedError).process_request(request)
 
             if require_live and not request.event.live:
                 can_access = (

src/pretix/testutils/settings.py

@@ -16,7 +16,7 @@ SITE_URL = "http://example.com"
 
 atexit.register(tmpdir.cleanup)
 
-EMAIL_BACKEND = 'django.core.mail.outbox'
+EMAIL_BACKEND = 'django.core.mail.backends.locmem.EmailBackend'
 
 COMPRESS_ENABLED = COMPRESS_OFFLINE = False
 COMPRESS_CACHE_BACKEND = 'testcache'

src/tests/base/test_permissions.py

@@ -38,7 +38,7 @@ def admin():
 def admin_request(admin, client):
     factory = RequestFactory()
     r = factory.get('/')
-    SessionMiddleware().process_request(r)
+    SessionMiddleware(NotImplementedError).process_request(r)
     r.session.save()
     admin.staffsession_set.create(date_start=now(), session_key=r.session.session_key)
     admin.staffsession_set.create(date_start=now(), session_key=client.session.session_key)