diff --git a/neutron/db/quota/driver.py b/neutron/db/quota/driver.py
index a715ba53070..3b72ffdd4ed 100644
--- a/neutron/db/quota/driver.py
+++ b/neutron/db/quota/driver.py
@@ -91,6 +91,8 @@ class DbQuotaDriver(object):
 
             tenant_quota[quota['resource']] = quota['limit']
 
+        # Convert values to a list to as caller expect an indexable iterable,
+        # where python3's dict_values does not support indexing
         return list(all_tenant_quotas.values())
 
     @staticmethod
diff --git a/tox.ini b/tox.ini
index db15ec3dafd..acf7279f503 100644
--- a/tox.ini
+++ b/tox.ini
@@ -152,6 +152,8 @@ commands = python -m testtools.run \
     neutron.tests.unit.plugins.cisco.n1kv.test_n1kv_db \
     neutron.tests.unit.plugins.cisco.n1kv.fake_client \
     neutron.tests.unit.plugins.cisco.test_network_db \
+    neutron.tests.unit.quota.test_resource \
+    neutron.tests.unit.quota.test_resource_registry \
     neutron.tests.unit.scheduler.test_l3_agent_scheduler \
     neutron.tests.unit.scheduler.test_dhcp_agent_scheduler \
     neutron.tests.unit.db.test_allowedaddresspairs_db \
@@ -160,6 +162,7 @@ commands = python -m testtools.run \
     neutron.tests.unit.db.test_l3_hamode_db \
     neutron.tests.unit.db.test_migration \
     neutron.tests.unit.db.test_agents_db \
+    neutron.tests.unit.db.quota.test_api \
     neutron.tests.unit.db.quota.test_driver \
     neutron.tests.unit.db.test_dvr_mac_db \
     neutron.tests.unit.db.test_securitygroups_db \