diff --git a/neutron/services/l3_router/service_providers/base.py b/neutron/services/l3_router/service_providers/base.py
index d264300648f..b2a414ed469 100644
--- a/neutron/services/l3_router/service_providers/base.py
+++ b/neutron/services/l3_router/service_providers/base.py
@@ -37,7 +37,7 @@ MANDATORY = _FeatureFlag(supports=True, requires=True)
 
 
 class L3ServiceProvider(object):
-    """Base class for L3 service providers.
+    """Base class for L3 service provider drivers.
 
     On __init__ this will be given a handle to the l3 plugin. It is then the
     responsibility of the driver to subscribe to the events it is interested
diff --git a/neutron/tests/unit/services/l3_router/service_providers/test_driver_controller.py b/neutron/tests/unit/services/l3_router/service_providers/test_driver_controller.py
index 93f07ae0553..9068f3d78b6 100644
--- a/neutron/tests/unit/services/l3_router/service_providers/test_driver_controller.py
+++ b/neutron/tests/unit/services/l3_router/service_providers/test_driver_controller.py
@@ -15,12 +15,15 @@
 import mock
 from mock import patch
 from neutron_lib import constants
+from neutron_lib import exceptions as lib_exc
 import testtools
 
 from neutron import context
 from neutron import manager
 from neutron.plugins.common import constants as p_cons
 from neutron.services.l3_router.service_providers import driver_controller
+from neutron.services import provider_configuration
+from neutron.tests import base
 from neutron.tests.unit import testlib_api
 
 
@@ -50,6 +53,20 @@ class TestDriverController(testlib_api.SqlTestCase):
                          self.dc._get_provider_for_router(self.ctx,
                                                           'router_id'))
 
+    def test__update_router_provider_invalid(self):
+        test_dc = driver_controller.DriverController(self.fake_l3)
+        with mock.patch.object(test_dc, "_get_provider_for_router"):
+            with mock.patch.object(
+                driver_controller,
+                "_ensure_driver_supports_request") as _ensure:
+                _ensure.side_effect = lib_exc.Invalid(message='message')
+                self.assertRaises(
+                    lib_exc.Invalid,
+                    test_dc._update_router_provider,
+                    None, None, None, None,
+                    None, {'name': 'testname'},
+                    {'flavor_id': 'old_fid'}, None)
+
     def test__set_router_provider_attr_lookups(self):
         # ensure correct drivers are looked up based on attrs
         cases = [
@@ -100,3 +117,12 @@ class TestDriverController(testlib_api.SqlTestCase):
                                             _fake_flavor_plugin}
         _dc = driver_controller.DriverController(self.fake_l3)
         self.assertEqual(_fake_flavor_plugin, _dc._flavor_plugin)
+
+
+class Test_LegacyPlusProviderConfiguration(base.BaseTestCase):
+
+    @mock.patch.object(provider_configuration.ProviderConfiguration,
+                       "add_provider")
+    def test__update_router_provider_invalid(self, mock_method):
+            mock_method.side_effect = lib_exc.Invalid(message='message')
+            driver_controller._LegacyPlusProviderConfiguration()