'The feed should get deepcopied, so this method of filtering shouldnt
work'

@implementation
def test_feed_filter_copy(self):

    self.setup_filter()
    original_count = len(self.test_feed[:])
    offset = self.test_feed[3:][0].serialization_id
    self.test_feed.filter(activity_id__lte=offset)
    self.assertEquals(len(self.test_feed[:]), original_count)
