diff --git a/nova/tests/functional/wsgi/test_attach_interfaces.py b/nova/tests/functional/wsgi/test_attach_interfaces.py
new file mode 100644
index 000000000000..721e9e331892
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+++ b/nova/tests/functional/wsgi/test_attach_interfaces.py
@@ -0,0 +1,95 @@
+# Copyright 2016 NTT Corporation.
+#
+# All Rights Reserved.
+#
+# 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.
+
+from nova.tests import fixtures as nova_fixtures
+from nova.tests.functional import integrated_helpers
+from nova.tests.unit import policy_fixture
+from nova.tests import uuidsentinel as uuids
+
+
+def create_request_body():
+    return {
+               "interfaceAttachment": {
+                   "port_id": uuids.port,
+                   "net_id": uuids.net,
+                   "fixed_ips": [
+                       {
+                           "ip_address": "192.168.1.3",
+                           "subnet_id": uuids.subnet
+                       }
+                   ]
+               }
+           }
+
+
+class InterfaceFullstack(integrated_helpers._IntegratedTestBase):
+    """Tests for port interfaces command.
+
+    Extension: os-interface
+
+    os-interface adds a set of functions to the port interfaces
+    for the creation and deletion of port interfaces.
+
+    POST /v2.1/{tenant_id}/servers/{server_id}/os-interface
+    DELETE /v2.1/{tenant_id}/servers/{server_id}/os-interface/{attachment_id}
+
+    Functional Test Scope:
+
+    This test starts the wsgi stack for the nova api services, uses an
+    in memory database to ensure the path through the wsgi layer to
+    the database.
+
+    """
+    api_major_version = 'v2.1'
+    _image_ref_parameter = 'imageRef'
+    _flavor_ref_parameter = 'flavorRef'
+
+    def setUp(self):
+        super(InterfaceFullstack, self).setUp()
+        self.useFixture(policy_fixture.RealPolicyFixture())
+        api_fixture = self.useFixture(nova_fixtures.OSAPIFixture())
+
+        self.api = api_fixture.api
+
+    def test_interface_func_negative(self):
+        """Test port interface edge conditions.
+
+        - Bogus body is a 400
+        """
+        # Create a server
+        server = self._build_minimal_create_server_request()
+        created_server = self.api.post_server({"server": server})
+        created_server_id = created_server['id']
+
+        # Test for API failure conditions
+        # bad body is 400
+        os_interface_url = '/servers/%s/os-interface' % created_server_id
+
+        # Check in the case that both net_id and port_id are specified.
+        body = create_request_body()
+        del body['interfaceAttachment']['fixed_ips']
+        resp = self.api.api_post(os_interface_url, body,
+                                 check_response_status=False)
+        self.assertEqual(400, resp.status)
+
+        # Check in the case that fixed_ips is specified,
+        # but net_id is not specifed.
+        body = create_request_body()
+        del body['interfaceAttachment']['port_id']
+        del body['interfaceAttachment']['net_id']
+        resp = self.api.api_post(os_interface_url, body,
+                                 check_response_status=False)
+        self.assertEqual(400, resp.status)