diff --git a/cinder/tests/unit/api/contrib/test_admin_actions.py b/cinder/tests/unit/api/contrib/test_admin_actions.py
index 9d6b28418dc..c87428cbfe9 100644
--- a/cinder/tests/unit/api/contrib/test_admin_actions.py
+++ b/cinder/tests/unit/api/contrib/test_admin_actions.py
@@ -91,7 +91,7 @@ class AdminActionsTest(BaseAdminTest):
                             group='oslo_concurrency')
         self.fixture.config(disable_process_locking=True,
                             group='oslo_concurrency')
-        self.flags(rpc_backend='cinder.openstack.common.rpc.impl_fake')
+        self.flags(transport_url='fake:/')
 
         cast_as_call.mock_cast_as_call(self.volume_api.volume_rpcapi.client)
         cast_as_call.mock_cast_as_call(self.volume_api.scheduler_rpcapi.client)
diff --git a/cinder/tests/unit/api/contrib/test_volume_actions.py b/cinder/tests/unit/api/contrib/test_volume_actions.py
index e18ea938498..95e9d787ce7 100644
--- a/cinder/tests/unit/api/contrib/test_volume_actions.py
+++ b/cinder/tests/unit/api/contrib/test_volume_actions.py
@@ -86,7 +86,7 @@ class VolumeActionsTest(test.TestCase):
         self.addCleanup(self.db_get_patcher.stop)
         self.mock_volume_db_get.return_value = vol
 
-        self.flags(rpc_backend='cinder.openstack.common.rpc.impl_fake')
+        self.flags(transport_url='fake:/')
 
     def test_simple_api_actions(self):
         app = fakes.wsgi_app(fake_auth_context=self.context)
@@ -514,7 +514,7 @@ class VolumeRetypeActionsTest(test.TestCase):
 
         self.context = context.RequestContext(fake.USER_ID, fake.PROJECT_ID,
                                               is_admin=False)
-        self.flags(rpc_backend='cinder.openstack.common.rpc.impl_fake')
+        self.flags(transport_url='fake:/')
 
         self.retype_mocks = {}
         paths = ('cinder.quota.QUOTAS.add_volume_type_opts',
diff --git a/cinder/tests/unit/conf_fixture.py b/cinder/tests/unit/conf_fixture.py
index d8870b976f0..fd1e0a7e27b 100644
--- a/cinder/tests/unit/conf_fixture.py
+++ b/cinder/tests/unit/conf_fixture.py
@@ -38,7 +38,7 @@ def set_defaults(conf):
                      'cinder.tests.fake_driver.FakeLoggingVolumeDriver',
                      group=configuration.SHARED_CONF_GROUP)
     conf.set_default('target_helper', 'fake')
-    conf.set_default('rpc_backend', 'cinder.openstack.common.rpc.impl_fake')
+    conf.set_default('transport_url', 'fake:/')
     conf.set_default('connection', 'sqlite://', group='database')
     conf.set_default('sqlite_synchronous', False, group='database')
     conf.set_default('policy_file', 'cinder.tests.unit/policy.json',
diff --git a/cinder/tests/unit/volume/drivers/huawei/test_huawei_drivers.py b/cinder/tests/unit/volume/drivers/huawei/test_huawei_drivers.py
index eae2dd61b11..81e329e0c16 100644
--- a/cinder/tests/unit/volume/drivers/huawei/test_huawei_drivers.py
+++ b/cinder/tests/unit/volume/drivers/huawei/test_huawei_drivers.py
@@ -2524,7 +2524,7 @@ class HuaweiISCSIDriverTestCase(HuaweiTestBase):
         super(HuaweiISCSIDriverTestCase, self).setUp()
         self.configuration = mock.Mock(spec=conf.Configuration)
         self.configuration.hypermetro_devices = hypermetro_devices
-        self.flags(rpc_backend='oslo_messaging._drivers.impl_fake')
+        self.flags(transport_url='fake:/')
         self.driver = FakeISCSIStorage(configuration=self.configuration)
         self.driver.do_setup()
         self.portgroup = 'portgroup-test'
@@ -4594,7 +4594,7 @@ class HuaweiFCDriverTestCase(HuaweiTestBase):
     def setUp(self):
         super(HuaweiFCDriverTestCase, self).setUp()
         self.configuration = mock.Mock(spec=conf.Configuration)
-        self.flags(rpc_backend='oslo_messaging._drivers.impl_fake')
+        self.flags(transport_url='fake:/')
         self.huawei_conf = FakeHuaweiConf(self.configuration, 'FC')
         self.configuration.hypermetro_devices = hypermetro_devices
         driver = FakeFCStorage(configuration=self.configuration)
diff --git a/cinder/tests/unit/zonemanager/test_fc_zone_manager.py b/cinder/tests/unit/zonemanager/test_fc_zone_manager.py
index 82eb8e5cc13..c848d0a3bed 100644
--- a/cinder/tests/unit/zonemanager/test_fc_zone_manager.py
+++ b/cinder/tests/unit/zonemanager/test_fc_zone_manager.py
@@ -46,10 +46,6 @@ target_list = ['20240002ac000a50']
 
 class TestFCZoneManager(test.TestCase):
 
-    @mock.patch('oslo_config.cfg._is_opt_registered', return_value=False)
-    def setUp(self, opt_mock):
-        super(TestFCZoneManager, self).setUp()
-
     def __init__(self, *args, **kwargs):
         super(TestFCZoneManager, self).__init__(*args, **kwargs)