PhpSpreadsheet/tests/data/Calculation/MathTrig/ROMAN.php

<?php

return [
    [
        49,
        'XLIX',
    ],
    [
        50,
        'L',
    ],
    [
        2012,
        'MMXII',
    ],
    [
        999,
        'CMXCIX',
    ],
    [
        499,
        'CDXCIX',
    ],
];