fixed default roles for mocked services

jupyterhub/tests/conftest.py

@@ -44,6 +44,7 @@ import jupyterhub.services.service
 from . import mocking
 from .. import crypto
 from .. import orm
+from ..roles import mock_roles
 from ..utils import random_port
 from .mocking import MockHub
 from .test_services import mockservice_cmd
@@ -245,6 +246,7 @@ def _mockservice(request, app, url=False):
     ):
         app.services = [spec]
         app.init_services()
+        mock_roles(app, name, 'services')
         assert name in app._service_map
         service = app._service_map[name]