diff --git a/tempest/services/compute/xml/common.py b/tempest/services/compute/xml/common.py
index bbc4e38..4b1b11a 100644
--- a/tempest/services/compute/xml/common.py
+++ b/tempest/services/compute/xml/common.py
@@ -100,7 +100,8 @@
     """
     json = {}
     for attr in node.keys():
-        json[attr] = node.get(attr)
+        if not attr.startswith("xmlns"):
+            json[attr] = node.get(attr)
     if not node.getchildren():
         return node.text or json
     for child in node.getchildren():
diff --git a/tempest/tests/compute/admin/test_quotas.py b/tempest/tests/compute/admin/test_quotas.py
index 7430a7c..7f64d15 100644
--- a/tempest/tests/compute/admin/test_quotas.py
+++ b/tempest/tests/compute/admin/test_quotas.py
@@ -122,15 +122,10 @@
 
         resp, quota_set = self.adm_client.update_quota_set(self.demo_tenant_id,
                                                            cores=vcpu_quota)
-        try:
-            self.create_server()
-        except exceptions.OverLimit:
-            pass
-        else:
-            self.fail("Could create servers over the VCPU quota limit")
-        finally:
-            self.adm_client.update_quota_set(self.demo_tenant_id,
-                                             cores=default_vcpu_quota)
+
+        self.addCleanup(self.adm_client.update_quota_set, self.demo_tenant_id,
+                        cores=default_vcpu_quota)
+        self.assertRaises(exceptions.OverLimit, self.create_server)
 
     def test_create_server_when_memory_quota_is_full(self):
         # Disallow server creation when tenant's memory quota is full
@@ -140,15 +135,10 @@
 
         self.adm_client.update_quota_set(self.demo_tenant_id,
                                          ram=mem_quota)
-        try:
-            self.create_server()
-        except exceptions.OverLimit:
-            pass
-        else:
-            self.fail("Could create servers over the memory quota limit")
-        finally:
-            self.adm_client.update_quota_set(self.demo_tenant_id,
-                                             ram=default_mem_quota)
+
+        self.addCleanup(self.adm_client.update_quota_set, self.demo_tenant_id,
+                        ram=default_mem_quota)
+        self.assertRaises(exceptions.OverLimit, self.create_server)
 
 #TODO(afazekas): Add test that tried to update the quota_set as a regular user
 
diff --git a/tempest/tests/compute/volumes/test_attach_volume.py b/tempest/tests/compute/volumes/test_attach_volume.py
index 2679312..7c1a2d1 100644
--- a/tempest/tests/compute/volumes/test_attach_volume.py
+++ b/tempest/tests/compute/volumes/test_attach_volume.py
@@ -28,6 +28,12 @@
     _interface = 'json'
     run_ssh = tempest.config.TempestConfig().compute.run_ssh
 
+    def __init__(self, *args, **kwargs):
+        super(AttachVolumeTestJSON, self).__init__(*args, **kwargs)
+        self.server = None
+        self.volume = None
+        self.attached = False
+
     @classmethod
     def setUpClass(cls):
         super(AttachVolumeTestJSON, cls).setUpClass()
@@ -37,9 +43,13 @@
         self.servers_client.detach_volume(server_id, volume_id)
         self.volumes_client.wait_for_volume_status(volume_id, 'available')
 
-    def _delete(self, server_id, volume_id):
-        self.volumes_client.delete_volume(volume_id)
-        self.servers_client.delete_server(server_id)
+    def _delete(self, server, volume):
+        if self.volume:
+            self.volumes_client.delete_volume(self.volume['id'])
+            self.volume = None
+        if self.server:
+            self.servers_client.delete_server(self.server['id'])
+            self.server = None
 
     def _create_and_attach(self):
         name = rand_name('server')
@@ -49,6 +59,7 @@
                                                          self.image_ref,
                                                          self.flavor_ref,
                                                          adminPass='password')
+        self.server = server
         self.servers_client.wait_for_server_status(server['id'], 'ACTIVE')
 
         # Record addresses so that we can ssh later
@@ -58,6 +69,7 @@
         # Create a volume and wait for it to become ready
         resp, volume = self.volumes_client.create_volume(1,
                                                          display_name='test')
+        self.volume = volume
         self.volumes_client.wait_for_volume_status(volume['id'], 'available')
 
         # Attach the volume to the server
@@ -65,18 +77,18 @@
                                           device='/dev/%s' % self.device)
         self.volumes_client.wait_for_volume_status(volume['id'], 'in-use')
 
-        return server, volume
+        self.attached = True
 
     @attr(type='positive')
     @testtools.skipIf(not run_ssh, 'SSH required for this test')
     def test_attach_detach_volume(self):
         # Stop and Start a server with an attached volume, ensuring that
         # the volume remains attached.
-        server, volume = self._create_and_attach()
-
-        attached = True
-
         try:
+            self._create_and_attach()
+            server = self.server
+            volume = self.volume
+
             self.servers_client.stop(server['id'])
             self.servers_client.wait_for_server_status(server['id'], 'SHUTOFF')
 
@@ -101,10 +113,12 @@
                                         self.ssh_user, server['adminPass'])
             partitions = linux_client.get_partitions()
             self.assertFalse(self.device in partitions)
+        except Exception:
+            self.fail("The test_attach_detach_volume is faild!")
         finally:
-            if attached:
+            if self.attached:
                 self._detach(server['id'], volume['id'])
-            self._delete(server['id'], volume['id'])
+            self._delete(self.server, self.volume)
 
 
 class AttachVolumeTestXML(AttachVolumeTestJSON):