public static L2ModificationInstruction decMplsTtl() {
        return new L2ModificationInstruction.ModMplsTtlInstruction();
    }
@Test
    public void testDecMplsTtlMethod() {
        final Instruction instruction = Instructions.decMplsTtl();
        final L2ModificationInstruction.ModMplsTtlInstruction modMplsTtlInstruction =
                checkAndConvert(instruction,
                                Instruction.Type.L2MODIFICATION,
                                L2ModificationInstruction.ModMplsTtlInstruction.class);
        assertThat(modMplsTtlInstruction.subtype(),
                   is(L2ModificationInstruction.L2SubType.DEC_MPLS_TTL));
    }