def METHOD_NAME():
    net = nw.case9()
    pp.runpp(net)
    elms_to_check = ["bus", "line", "load"]
    for elm in elms_to_check:
        assert net["res_%s" % elm].shape[0]
    pp.clear_result_tables(net)
    for elm in elms_to_check:
        assert not net["res_%s" % elm].shape[0]