Helper and docs for offlinesales API (#5302)

src/tests/multidomain/test_urlreverse.py

@@ -23,11 +23,11 @@ import pytest
 from django.test import override_settings
 from django.utils.timezone import now
 from django_scopes import scopes_disabled
-from tests import assert_num_queries
 
 from pretix.base.models import Event, Organizer
 from pretix.multidomain.models import KnownDomain
 from pretix.multidomain.urlreverse import build_absolute_uri, eventreverse
+from pretix.testutils.queries import assert_num_queries
 
 
 @pytest.fixture