Add negative tests for deleting attached volume

Due to lack of an error handling, Nova's delete-volume API returns
HTTP500 error when deleting an attached volume.
This patch adds the corresponding test for reproducing the problem
on the gate and blocking the same issue in the future.

Change-Id: Idb6267be770bcf2541595babebf269cdc71c2b8d
Depends-On: Ia07556b2dc18678baa4c8fbd65820d8047362ef9
Related-Bug: #1630783
diff --git a/tempest/api/compute/volumes/test_attach_volume_negative.py b/tempest/api/compute/volumes/test_attach_volume_negative.py
new file mode 100644
index 0000000..b7fa0fe
--- /dev/null
+++ b/tempest/api/compute/volumes/test_attach_volume_negative.py
@@ -0,0 +1,41 @@
+# Copyright 2016 NEC 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 tempest.api.compute import base
+from tempest import config
+from tempest.lib import exceptions as lib_exc
+from tempest import test
+
+CONF = config.CONF
+
+
+class AttachVolumeNegativeTest(base.BaseV2ComputeTest):
+
+    @classmethod
+    def skip_checks(cls):
+        super(AttachVolumeNegativeTest, cls).skip_checks()
+        if not CONF.service_available.cinder:
+            skip_msg = ("%s skipped as Cinder is not available" % cls.__name__)
+            raise cls.skipException(skip_msg)
+
+    @test.idempotent_id('a313b5cd-fbd0-49cc-94de-870e99f763c7')
+    def test_delete_attached_volume(self):
+        server = self.create_test_server(wait_until='ACTIVE')
+        volume = self.create_volume()
+
+        path = "/dev/%s" % CONF.compute.volume_device_name
+        self.attach_volume(server, volume, device=path)
+
+        self.assertRaises(lib_exc.BadRequest,
+                          self.delete_volume, volume['id'])