https://opendev.org/openstack/cinder-tempest-plugin/src/commit/6083cccd5de08559179b4b9e395d3d6ad14d68fc/cinder_tempest_plugin/api/volume/test_multiple_volume_from_resource.py#L91

cinder-tempest-plugin has a test for multiple simultaneous image->volume operations.  In regards to bug OSPRH-13207 , it would be helpful to clone this test to do the opposite operation with volume->image.