On a forum, create a new discussion in offline or server down. Check that you see a sync button. Check that clicking the sync button in offline/server down shows an error. Go back online or turn server up and click synchronize. Check that discussion have been stored. Repeat both steps editing the discussion before syncing. Now reply to a discussion in offline. Check that clicking the sync button in offline/server down shows an error. Go back online or turn server up and click synchronize. Check that reply have been stored. Reply again to a discussion in offline. Edit the reply. Go back discussion list (not necessary in split view), and click on Sync button from the discussion list. Check it synced.