def METHOD_NAME(self, celery, session):
    lat = 1.234567
    lon = 2.345678
    shard_id = DataMap.shard_id(*DataMap.scale(lat, lon))
    self._queue(celery, [(lat, lon)])
    update_datamap.delay(shard_id=shard_id).get()
    grids = session.query(DataMap.shards()[shard_id]).all()
    assert len(grids) == 1
    self._check_position(grids[0], 1.235, 2.346)
    assert grids[0].created == self.today
    assert grids[0].modified == self.today