DR testing with Always On

I have an Always On secondary replica of a production DB. We need to perform DR testing against it which requires it to be read-write during the test. When the test is over (perhaps takes 1 hour) I want to convert it back to a read-only Always On replica and have it automatically resync with the primary replica. The catch is I don't want to have to restore the replica with a backup of the primary. Is there a way to do this and avoid the restore?

We do the same thing in Oracle using a feature called Snapshot Standby. Does SQL have this capability?

Chuck