public static L3ModificationInstruction modL3ArpOp(short op) {
        return new ModArpOpInstruction(L3SubType.ARP_OP, op);
    }
@Test
    public void testModArpModL3ArpOpMethod() {
        final Instruction instruction = Instructions.modL3ArpOp((short) 1);
        final L3ModificationInstruction.ModArpOpInstruction modArpEthInstruction =
                checkAndConvert(instruction,
                                Instruction.Type.L3MODIFICATION,
                                L3ModificationInstruction.ModArpOpInstruction.class);
        assertThat(modArpEthInstruction.subtype(),
                   is(L3ModificationInstruction.L3SubType.ARP_OP));
        assertThat(modArpEthInstruction.op(), is(1L));
    }