diff --git a/tests/test_web.py b/tests/test_web.py
index 3dbfb1b..d33470c 100644
--- a/tests/test_web.py
+++ b/tests/test_web.py
@@ -267,7 +267,7 @@ class TestPublic(unittest.TestCase):
         instance_config = self.client.get_config_info()
         if not instance_config.get('registration'):
             return None
-        for login in ["login", "user", "username", "help", "test", "about", "administration", "account"]:
+        for login in ['login', 'user', 'username', 'help', 'test', 'about', 'administration', 'account']:
             user = self.client.create_user(name='test Name', login=login,
                                         organisation='test Organization', email='test@testorg.local')
             self.assertEqual(user['message'], 'Username not allowed.')