diff --git a/nova/tests/fake_flags.py b/nova/tests/fake_flags.py
index 3fcc9fac..83ec33ca 100644
--- a/nova/tests/fake_flags.py
+++ b/nova/tests/fake_flags.py
@@ -45,3 +45,5 @@ def set_defaults(conf):
     conf.set_default('rpc_response_timeout', 5)
     conf.set_default('rpc_cast_timeout', 5)
     conf.set_default('lock_path', None)
+    conf.set_default('floating_ip_dns_manager', 'nova.tests.utils.dns_manager')
+    conf.set_default('instance_dns_manager', 'nova.tests.utils.dns_manager')
diff --git a/nova/tests/test_xenapi.py b/nova/tests/test_xenapi.py
index 6d068625..acc1a6da 100644
--- a/nova/tests/test_xenapi.py
+++ b/nova/tests/test_xenapi.py
@@ -982,6 +982,7 @@ class XenAPIVMTestCase(stubs.XenAPITestBase):
         instance_values = {
             'id': instance_id,
             'uuid': '00000000-0000-0000-0000-00000000000%d' % instance_id,
+            'display_name': 'host-%d' % instance_id,
             'project_id': self.project_id,
             'user_id': self.user_id,
             'image_ref': 1,