JanKusanagi at
IIRC, there was a tracking issue for this, with specific checkboxes.
AFAIK, they're working on the S2S part.
@jankusanagi@datamost.com Thank you, I found that issue with checkboxes: https://github.com/pump-io/pump.io/issues/1241
Unfortunately there are no separate client to server boxes there :-)
Anyway, I've noted "must" checks of client to server implementations at http://activitypub.rocks/implementation-report/ and starting to add them to #AndStatus in order to be "closer" to the really working #ActivityPub client :-)