Do not show availability for currently-selected add-on

src/tests/base/__init__.py

@@ -2,7 +2,7 @@ from bs4 import BeautifulSoup
 from django.test import TestCase
 
 
-class SoupTest(TestCase):
+class SoupTestMixin:
 
     def get_doc(self, *args, **kwargs):
         response = self.client.get(*args, **kwargs)
@@ -17,6 +17,10 @@ class SoupTest(TestCase):
             return BeautifulSoup(response.content, "lxml")
 
 
+class SoupTest(SoupTestMixin, TestCase):
+    pass
+
+
 def extract_form_fields(soup):
     """
     Turn a BeautifulSoup form in to a dict of fields and default values

src/tests/control/test_vouchers.py

@@ -3,9 +3,10 @@ import decimal
 import json
 
 from django.core import mail as djmail
+from django.test import TransactionTestCase
 from django.utils.timezone import now
 from django_scopes import scopes_disabled
-from tests.base import SoupTest, extract_form_fields
+from tests.base import SoupTestMixin, extract_form_fields
 
 from pretix.base.models import (
     Event, Item, ItemVariation, Order, OrderPosition, Organizer, Quota, Team,
@@ -13,7 +14,7 @@ from pretix.base.models import (
 )
 
 
-class VoucherFormTest(SoupTest):
+class VoucherFormTest(SoupTestMixin, TransactionTestCase):
     @scopes_disabled()
     def setUp(self):
         super().setUp()