Currently on testwiki, the abusefilter-revert user right isn't assigned to any groups. I believe this should be assigned to the sysop group since the block consequence is enabled there, and there are likely people, including myself, who want to test this feature.
I'm filing this task directly because there isn't an appropriate venue to gain consensus for this on testwiki (and I don't believe this change is that controversial).
It's easy to make a patch for this, so if you support the change, please leave a comment.