old_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  #    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.tests.volume import base
  
  
  class VolumesSnapshotTest(base.BaseVolumeTest):
      _interface = "json"
  
      def test_volume_from_snapshot(self):
          volume_origin = self.create_volume(size=1)
          snapshot = self.create_snapshot(volume_origin['id'])
          volume_snap = self.create_volume(size=1,
                                           snapshot_id=
                                           snapshot['id'])
          self.snapshots_client.delete_snapshot(snapshot['id'])
          self.volumes_client.delete_volume(volume_snap['id'])
          self.snapshots_client.wait_for_resource_deletion(snapshot['id'])
          self.snapshots.remove(snapshot)
          self.volumes_client.delete_volume(volume_origin['id'])
          self.volumes_client.wait_for_resource_deletion(volume_snap['id'])
          self.volumes.remove(volume_snap)
          self.volumes_client.wait_for_resource_deletion(volume_origin['id'])
          self.volumes.remove(volume_origin)
  
  
  class VolumesSnapshotTestXML(VolumesSnapshotTest):
      _interface = "xml"
  
new_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  #    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.test import attr
  from tempest.tests.volume import base
  
  
  class VolumesSnapshotTest(base.BaseVolumeTest):
      _interface = "json"
  
      @classmethod
      def setUpClass(cls):
          super(VolumesSnapshotTest, cls).setUpClass()
          try:
              cls.volume_origin = cls.create_volume()
          except Exception:
              cls.tearDownClass()
              raise
  
      @classmethod
      def tearDownClass(cls):
          super(VolumesSnapshotTest, cls).tearDownClass()
          cls.clear_volumes()
  
      @attr(type='smoke')
      def test_snapshot_create_get_delete(self):
          # Create a snapshot, get some of the details and then deletes it
          resp, snapshot = self.snapshots_client.create_snapshot(
              self.volume_origin['id'])
          self.assertEqual(200, resp.status)
          self.snapshots_client.wait_for_snapshot_status(snapshot['id'],
                                                         'available')
          errmsg = "Referred volume origin ID mismatch"
          self.assertEqual(self.volume_origin['id'],
                           snapshot['volume_id'],
                           errmsg)
          self.snapshots_client.delete_snapshot(snapshot['id'])
          self.snapshots_client.wait_for_resource_deletion(snapshot['id'])
  
      def test_volume_from_snapshot(self):
          # Test if creation of snap based volumes succeeds
          snapshot = self.create_snapshot(self.volume_origin['id'])
          # NOTE: size is required also when passing snapshot_id
          resp, volume = self.volumes_client.create_volume(
              size=1,
              snapshot_id=snapshot['id'])
          self.assertEqual(200, resp.status)
          self.volumes_client.wait_for_volume_status(volume['id'], 'available')
          self.volumes_client.delete_volume(volume['id'])
          self.volumes_client.wait_for_resource_deletion(volume['id'])
          self.clear_snapshots()
  
  
  class VolumesSnapshotTestXML(VolumesSnapshotTest):
      _interface = "xml"
  
subject: Add a test for creation of volumes' snapshots.