diff --git a/nova/tests/unit/policies/base.py b/nova/tests/unit/policies/base.py
index 8376cc9cdf..261a0f1631 100644
--- a/nova/tests/unit/policies/base.py
+++ b/nova/tests/unit/policies/base.py
@@ -124,6 +124,13 @@ class BasePolicyTest(test.TestCase):
             self.policy.set_rules(self.rules_without_deprecation,
                                   overwrite=False)

+    def common_policy_auth(self, authorized_contexts,
+                           rule_name,
+                           func, req, *arg, **kwarg):
+        unauth = set(self.all_contexts) - set(authorized_contexts)
+        return self.common_policy_check(authorized_contexts, unauth,
+                                        rule_name, func, req, *arg, **kwarg)
+
     def common_policy_check(self, authorized_contexts,
                             unauthorized_contexts, rule_name,
                             func, req, *arg, **kwarg):