diff --git a/karbor/tests/unit/api/v1/test_quotas.py b/karbor/tests/unit/api/v1/test_quotas.py
index 92f92f5d..e666475f 100644
--- a/karbor/tests/unit/api/v1/test_quotas.py
+++ b/karbor/tests/unit/api/v1/test_quotas.py
@@ -49,6 +49,16 @@ class QuotaApiTest(base.TestCase):
         self.assertRaises(exc.HTTPBadRequest, self.controller.update,
                           req, '111', body=body)
 
+    @mock.patch(
+        'karbor.quota.DbQuotaDriver.get_defaults')
+    def test_quota_defaults(self, mock_quota_get):
+        req = fakes.HTTPRequest.blank(
+            'v1/quotas/73f74f90a1754bd7ad658afb3272323f',
+            use_admin_context=True)
+        self.controller.defaults(
+            req, '73f74f90a1754bd7ad658afb3272323f')
+        self.assertTrue(mock_quota_get.called)
+
     @mock.patch(
         'karbor.quota.DbQuotaDriver.get_project_quotas')
     def test_quota_detail(self, mock_quota_get):