Fixes MRO serial issue

    # Sort the keys to ensure proper iteration order

    keys = sorted(translation.keys())

    for k in keys:

        try:

            group = translation[k]

import os

import sys

import unittest

from plio.examples import get_path

sys.path.insert(0, os.path.abspath('..'))

import pytest

from plio.io import isis_serial_number

from plio.examples import get_path

@pytest.fixture

def apollo_lbl():

    return get_path('Test_PVL.lbl')

class TestIsisSerials(unittest.TestCase):

@pytest.fixture

def ctx_lbl():

    return get_path('ctx.pvl')

    def test_generate_serial_number(self):

        label = get_path('Test_PVL.lbl')

@pytest.mark.parametrize("label, expected", [(apollo_lbl(), 'APOLLO15/METRIC/1971-07-31T14:02:27.179'),

                                             (ctx_lbl(),'MRO/CTX/0906095311:038')

                                             ])

def test_generate_serial_number(label, expected):

    serial = isis_serial_number.generate_serial_number(label)

        self.assertEqual('APOLLO15/METRIC/1971-07-31T14:02:27.179', serial)

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    assert serial == expected

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