diff --git a/nova/api/openstack/__init__.py b/nova/api/openstack/__init__.py
index c16140a542..2fe8a6a35d 100644
--- a/nova/api/openstack/__init__.py
+++ b/nova/api/openstack/__init__.py
@@ -255,15 +255,17 @@ class APIRouterV21(base_wsgi.Router):
     and method.
     """
 
-    # TODO(oomichi): This namespace will be changed after moving all v3 APIs
-    # to v2.1.
-    API_EXTENSION_NAMESPACE = 'nova.api.v3.extensions'
-
     @classmethod
     def factory(cls, global_config, **local_config):
         """Simple paste factory, :class:`nova.wsgi.Router` doesn't have one."""
         return cls()
 
+    @staticmethod
+    def api_extension_namespace():
+        # TODO(oomichi): This namespaces will be changed after moving all v3
+        # APIs to v2.1.
+        return 'nova.api.v3.extensions'
+
     def __init__(self, init_only=None, v3mode=False):
         # TODO(cyeoh): bp v3-api-extension-framework. Currently load
         # all extensions but eventually should be able to exclude
@@ -313,7 +315,7 @@ class APIRouterV21(base_wsgi.Router):
                         list(in_blacklist_and_whitelist))
 
         self.api_extension_manager = stevedore.enabled.EnabledExtensionManager(
-            namespace=self.API_EXTENSION_NAMESPACE,
+            namespace=self.api_extension_namespace(),
             check_func=_check_load_extension,
             invoke_on_load=True,
             invoke_kwds={"extension_info": self.loaded_extension_info})
diff --git a/nova/tests/unit/api/openstack/compute/test_plugin_framework.py b/nova/tests/unit/api/openstack/compute/test_plugin_framework.py
new file mode 100644
index 0000000000..5b4ce6fa5d
--- /dev/null
+++ b/nova/tests/unit/api/openstack/compute/test_plugin_framework.py
@@ -0,0 +1,36 @@
+# Copyright 2014 IBM Corp.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import mock
+from oslo.config import cfg
+from oslo.serialization import jsonutils
+
+from nova import test
+from nova.tests.unit.api.openstack import fakes
+
+CONF = cfg.CONF
+
+
+class PluginTest(test.NoDBTestCase):
+
+    @mock.patch("nova.api.openstack.APIRouterV21.api_extension_namespace")
+    def test_plugin_framework_index(self, mock_namespace):
+        mock_namespace.return_value = 'nova.api.v3.test_extensions'
+
+        app = fakes.wsgi_app_v21(init_only='test-basic')
+        req = fakes.HTTPRequest.blank('/v2/fake/test')
+        res = req.get_response(app)
+        self.assertEqual(200, res.status_int)
+        resp_json = jsonutils.loads(res.body)
+        self.assertEqual('val', resp_json['param'])
diff --git a/nova/tests/unit/api/openstack/compute/test_plugins/__init__.py b/nova/tests/unit/api/openstack/compute/test_plugins/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/nova/tests/unit/api/openstack/compute/test_plugins/basic.py b/nova/tests/unit/api/openstack/compute/test_plugins/basic.py
new file mode 100644
index 0000000000..abad891b06
--- /dev/null
+++ b/nova/tests/unit/api/openstack/compute/test_plugins/basic.py
@@ -0,0 +1,43 @@
+# Copyright 2014 IBM Corp.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+"""Basic Test Extension"""
+
+from nova.api.openstack import extensions
+from nova.api.openstack import wsgi
+
+
+ALIAS = 'test-basic'
+
+
+class BasicController(wsgi.Controller):
+
+    def index(self, req):
+        data = {'param': 'val'}
+        return data
+
+
+class Basic(extensions.V3APIExtensionBase):
+    """Basic Test Extension."""
+
+    name = "BasicTest"
+    alias = ALIAS
+    version = 1
+
+    def get_resources(self):
+        resource = extensions.ResourceExtension('test', BasicController())
+        return [resource]
+
+    def get_controller_extensions(self):
+        return []
diff --git a/setup.cfg b/setup.cfg
index 8d679b5fa7..4b152149fa 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -158,6 +158,10 @@ nova.api.v3.extensions.server.update =
 nova.api.v3.extensions.server.resize =
     disk_config = nova.api.openstack.compute.plugins.v3.disk_config:DiskConfig
 
+nova.api.v3.test_extensions =
+    basic = nova.tests.unit.api.openstack.compute.test_plugins.basic:Basic
+
+
 # These are for backwards compat with Havana notification_driver configuration values
 oslo.messaging.notify.drivers =
     nova.openstack.common.notifier.log_notifier = oslo.messaging.notify._impl_log:LogDriver