We associate test code deployments with a Revision so that others can easily and transparently see what code is running in production. However, currently there's no way to easily check if the Revision is up to date.
It would be great to have an Arcanist command to verify that the workspace under the current branch matches the latest uploaded Revision associated with that branch. In other words, the command should return whether running arc diff --update would cause any changes to the existing revision.