diff --git a/neutron/tests/unit/plugins/ml2/drivers/agent/test_capabilities.py b/neutron/tests/unit/plugins/ml2/drivers/agent/test_capabilities.py
index 313526147b3..34a2bdfae1c 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/agent/test_capabilities.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/agent/test_capabilities.py
@@ -13,6 +13,7 @@
 
 import mock
 from neutron_lib.callbacks import events
+from neutron_lib import fixture
 
 from neutron.plugins.ml2.drivers.agent import capabilities
 from neutron.tests import base
@@ -20,23 +21,25 @@ from neutron.tests import base
 
 class CapabilitiesTest(base.BaseTestCase):
 
-    # TODO(boden) replace with neutron_lib fixture once working
-    @mock.patch("neutron_lib.callbacks.manager.CallbacksManager.notify")
-    def test_notify_init_event(self, mocked_manager):
+    def setUp(self):
+        super(CapabilitiesTest, self).setUp()
+        self._mgr = mock.Mock()
+        self.useFixture(fixture.CallbackRegistryFixture(
+            callback_manager=self._mgr))
+
+    def test_notify_init_event(self):
         mock_agent_type = mock.Mock()
         mock_agent = mock.Mock()
         capabilities.notify_init_event(mock_agent_type, mock_agent)
-        mocked_manager.assert_called_with(mock_agent_type,
-                                          events.AFTER_INIT,
-                                          mock_agent,
-                                          agent=mock_agent)
+        self._mgr.notify.assert_called_with(mock_agent_type,
+                                            events.AFTER_INIT,
+                                            mock_agent,
+                                            agent=mock_agent)
 
-    # TODO(boden) replace with neutron_lib fixture once working
-    @mock.patch("neutron_lib.callbacks.manager.CallbacksManager.subscribe")
-    def test_register(self, mocked_subscribe):
+    def test_register(self):
         mock_callback = mock.Mock()
         mock_agent_type = mock.Mock()
         capabilities.register(mock_callback, mock_agent_type)
-        mocked_subscribe.assert_called_with(mock_callback,
-                                            mock_agent_type,
-                                            events.AFTER_INIT)
+        self._mgr.subscribe.assert_called_with(mock_callback,
+                                               mock_agent_type,
+                                               events.AFTER_INIT)
diff --git a/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_capabilities.py b/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_capabilities.py
index 70d83757866..6b20c86f4e2 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_capabilities.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_capabilities.py
@@ -14,6 +14,7 @@
 import mock
 
 from neutron_lib.callbacks import events
+from neutron_lib import fixture
 
 from neutron.plugins.ml2.drivers.openvswitch.agent import ovs_capabilities
 from neutron.services.trunk.drivers.openvswitch.agent import driver
@@ -23,10 +24,14 @@ from neutron_lib import constants
 
 class CapabilitiesTest(base.BaseTestCase):
 
-    # TODO(boden) replace with neutron_lib fixture once working
-    @mock.patch("neutron_lib.callbacks.manager.CallbacksManager.subscribe")
-    def test_register(self, mocked_subscribe):
+    def setUp(self):
+        super(CapabilitiesTest, self).setUp()
+        self._mgr = mock.Mock()
+        self.useFixture(fixture.CallbackRegistryFixture(
+            callback_manager=self._mgr))
+
+    def test_register(self):
         ovs_capabilities.register()
-        mocked_subscribe.assert_called_with(driver.init_handler,
+        self._mgr.subscribe.assert_called_with(driver.init_handler,
                                             constants.AGENT_TYPE_OVS,
                                             events.AFTER_INIT)
diff --git a/neutron/tests/unit/services/trunk/rpc/test_backend.py b/neutron/tests/unit/services/trunk/rpc/test_backend.py
index 2484e5d6e4c..00ec02ed847 100644
--- a/neutron/tests/unit/services/trunk/rpc/test_backend.py
+++ b/neutron/tests/unit/services/trunk/rpc/test_backend.py
@@ -13,6 +13,7 @@
 
 import mock
 from neutron_lib.callbacks import events
+from neutron_lib import fixture
 
 from neutron.api.rpc.callbacks import resource_manager
 from neutron.services.trunk import callbacks
@@ -25,12 +26,13 @@ class ServerSideRpcBackendTest(base.BaseTestCase):
     # TODO(fitoduarte): add more test to improve coverage of module
     def setUp(self):
         super(ServerSideRpcBackendTest, self).setUp()
+        self._mgr = mock.Mock()
+        self.useFixture(fixture.CallbackRegistryFixture(
+            callback_manager=self._mgr))
         self.register_mock = mock.patch.object(
             resource_manager.ResourceCallbacksManager, "register").start()
 
-    # TODO(boden) replace with neutron_lib fixture once working
-    @mock.patch("neutron_lib.callbacks.manager.CallbacksManager.subscribe")
-    def test___init__(self, mocked_subscribe):
+    def test___init__(self,):
         test_obj = backend.ServerSideRpcBackend()
 
         calls = [mock.call(test_obj.process_event,
@@ -46,7 +48,7 @@ class ServerSideRpcBackendTest(base.BaseTestCase):
                            trunk_consts.SUBPORTS,
                            events.AFTER_DELETE)
                  ]
-        mocked_subscribe.assert_has_calls(calls, any_order=True)
+        self._mgr.subscribe.assert_has_calls(calls, any_order=True)
 
     def test_process_event(self):
         test_obj = backend.ServerSideRpcBackend()