public static Criterion matchTcpDst(TpPort tcpPort) {
        return new TcpPortCriterion(tcpPort, Type.TCP_DST);
    }
@Test
    public void testMatchTcpDstMethod() {
        Criterion matchTcpDst = Criteria.matchTcpDst(tpPort1);
        TcpPortCriterion tcpPortCriterion =
                checkAndConvert(matchTcpDst,
                                Criterion.Type.TCP_DST,
                                TcpPortCriterion.class);
        assertThat(tcpPortCriterion.tcpPort(), is(equalTo(tpPort1)));
    }