acl = new AccessControlList("sinatra ratpack,@lasVegas"); // netgroup
acl = new AccessControlList(" somegroup,@someNetgroup"); // no user
// this ACL will be used for testing ACLs
acl = new AccessControlList("carlPerkins ratpack,@lasVegas");
acl.addGroup("@memphis");
// validate the netgroups before and after rehresh to make
// sure refresh works correctly
validateNetgroups(groups, acl);
groups.refresh();