This feature is tested in CMS side.
But not in Solr side (see code coverage).
It was not done before, because it would mean the Solr project depends on the Ametys project.
But we can try to mock a fake Ametys server and not use the real code of Ametys side, just to test the code of Solr.
It would be very useful, because the ACL code is the most complex and critic of the Solr project code.
For instance, we need to test two requests at the time to test our locks, etc.