public static L1ModificationInstruction modL1OduSignalId(OduSignalId oduSignalId) {
        checkNotNull(oduSignalId, "L1 ODU signal ID cannot be null");
        return new ModOduSignalIdInstruction(oduSignalId);
    }
@Test
    public void testModL1OduSignalIdMethod() {
        Instruction instruction = Instructions.modL1OduSignalId(odu1);
        L1ModificationInstruction.ModOduSignalIdInstruction oduInstruction =
                checkAndConvert(instruction, Instruction.Type.L1MODIFICATION,
                        L1ModificationInstruction.ModOduSignalIdInstruction.class);
        assertThat(oduInstruction.oduSignalId(), is(odu1));
    }