How to use _create_volume_from_snapshot method in tempest

Best Python code snippet using tempest_python

test_volumes_snapshots.py

Source:test_volumes_snapshots.py

...106        self.assertEqual(new_s_name, updated_snapshot['name'])107        self.assertEqual(new_desc, updated_snapshot['description'])108        # Delete the snapshot109        self.delete_snapshot(snapshot['id'])110    def _create_volume_from_snapshot(self, extra_size=0):111        src_size = CONF.volume.volume_size112        size = src_size + extra_size113        src_vol = self.create_volume(size=src_size)114        src_snap = self.create_snapshot(src_vol['id'])115        dst_vol = self.create_volume(snapshot_id=src_snap['id'],116                                     size=size)117        # NOTE(zhufl): dst_vol is created based on snapshot, so dst_vol118        # should be deleted before deleting snapshot, otherwise deleting119        # snapshot will end with status 'error-deleting'. This depends on120        # the implementation mechanism of vendors, generally speaking,121        # some verdors will use "virtual disk clone" which will promote122        # disk clone speed, and in this situation the "disk clone"123        # is just a relationship between volume and snapshot.124        self.addCleanup(self.delete_volume, self.volumes_client, dst_vol['id'])125        volume = self.volumes_client.show_volume(dst_vol['id'])['volume']126        # Should allow127        self.assertEqual(volume['snapshot_id'], src_snap['id'])128        self.assertEqual(volume['size'], size)129    @decorators.idempotent_id('677863d1-3142-456d-b6ac-9924f667a7f4')130    def test_volume_from_snapshot(self):131        # Creates a volume from a snapshot passing a size132        # different from the source133        self._create_volume_from_snapshot(extra_size=1)134    @decorators.idempotent_id('053d8870-8282-4fff-9dbb-99cb58bb5e0a')135    def test_volume_from_snapshot_no_size(self):136        # Creates a volume from a snapshot defaulting to original size137        self._create_volume_from_snapshot()138    @decorators.idempotent_id('bbcfa285-af7f-479e-8c1a-8c34fc16543c')139    @testtools.skipUnless(CONF.volume_feature_enabled.backup,140                          "Cinder backup is disabled")141    def test_snapshot_backup(self):142        # Create a snapshot143        snapshot = self.create_snapshot(volume_id=self.volume_origin['id'])144        backup = self.create_backup(volume_id=self.volume_origin['id'],145                                    snapshot_id=snapshot['id'])146        waiters.wait_for_volume_resource_status(self.snapshots_client,147                                                snapshot['id'], 'available')148        backup_info = self.backups_client.show_backup(backup['id'])['backup']149        self.assertEqual(self.volume_origin['id'], backup_info['volume_id'])...

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