public static L2ModificationInstruction modTunnelId(long tunnelId) {
        return new L2ModificationInstruction.ModTunnelIdInstruction(tunnelId);
    }
@Test
    public void testModTunnelIdMethod() {
        final Instruction instruction = Instructions.modTunnelId(tunnelId1);
        final L2ModificationInstruction.ModTunnelIdInstruction modTunnelIdInstruction =
                checkAndConvert(instruction, Instruction.Type.L2MODIFICATION,
                                L2ModificationInstruction.ModTunnelIdInstruction.class);
        assertThat(modTunnelIdInstruction.tunnelId(), is(equalTo(tunnelId1)));
        assertThat(modTunnelIdInstruction.subtype(),
                   is(equalTo(L2ModificationInstruction.L2SubType.TUNNEL_ID)));
    }