def mark_activity(self, activity_id, seen=True, read=False):
        self.mark_activities([activity_id], seen, read)
Check we can download files references in RDFValueCollection.
dataset/ETHPy150Open tschellenbach/Stream-Framework/stream_framework/feeds/notification_feed/base.py/BaseNotificationFeed.mark_activity--crossover with--dataset/ETHPy150Open google/grr/grr/lib/export_utils_test.py/TestExports.testDownloadCollection