Add exceptions to baremetal/db/api

Raise exceptions from baremetal/db/sqlalchemy/api.py
  following the precedents from nova/db/sqlalchemy/api.py.
Fixes tests to expect the new exceptions.
Adds __init__ so that baremetal tests work in isolation.

blueprint general-bare-metal-provisioning-framework

Change-Id: Ic8ef66e8f3180460a7bf117fccbfe15078905d8b

nova/tests/baremetal/__init__.py

@@ -0,0 +1,15 @@
+# Copyright (c) 2012 NTT DOCOMO, INC.
+# 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 *

nova/tests/baremetal/db/test_bm_interface.py

@@ -42,6 +42,13 @@ class BareMetalInterfaceTestCase(base.BMDBTestCase):
         pif2_id = db.bm_interface_create(self.context, 2, '22:22:22:22:22:22',
                                          '0x2', 2)
         db.bm_interface_set_vif_uuid(self.context, pif1_id, 'AAAA')
-        self.assertRaises(exception.DBError,
+        self.assertRaises(exception.NovaException,
                           db.bm_interface_set_vif_uuid,
                           self.context, pif2_id, 'AAAA')
+
+    def test_vif_not_found(self):
+        pif_id = db.bm_interface_create(self.context, 1, '11:11:11:11:11:11',
+                                        '0x1', 1)
+        self.assertRaises(exception.NovaException,
+                          db.bm_interface_set_vif_uuid,
+                          self.context, pif_id + 1, 'AAAA')

nova/tests/baremetal/db/test_bm_node.py

@@ -17,6 +17,7 @@
 Bare-Metal DB testcase for BareMetalNode
 """
 
+from nova import exception
 from nova.tests.baremetal.db import base
 from nova.tests.baremetal.db import utils
 from nova.virt.baremetal import db
@@ -67,8 +68,10 @@ class BareMetalNodesTestCase(base.BMDBTestCase):
         r = db.bm_node_get(self.context, self.ids[1])
         self.assertEquals(r['pm_address'], '1')
 
-        r = db.bm_node_get(self.context, -1)
+        self.assertRaises(
-        self.assertTrue(r is None)
+              exception.InstanceNotFound,
+              db.bm_node_get,
+              self.context, -1)
 
     def test_get_by_service_host(self):
         self._create_nodes()
@@ -97,8 +100,10 @@ class BareMetalNodesTestCase(base.BMDBTestCase):
 
         db.bm_node_destroy(self.context, self.ids[0])
 
-        r = db.bm_node_get(self.context, self.ids[0])
+        self.assertRaises(
-        self.assertTrue(r is None)
+              exception.InstanceNotFound,
+              db.bm_node_get,
+              self.context, self.ids[0])
 
         r = db.bm_node_get_all(self.context)
         self.assertEquals(len(r), 5)