JSTests/stress/intl-durationformat-basic.js

function shouldBe(actual, expected) {
    if (actual !== expected)
        throw new Error(`expected ${expected} but got ${actual}`);
}

function shouldBeOneOf(actual, expectedArray) {
    if (!expectedArray.some((value) => value === actual))
        throw new Error('bad value: ' + actual + ' expected values: ' + expectedArray);
}

function shouldNotThrow(func) {
    func();
}

function shouldThrow(func, errorType) {
    let error;
    try {
        func();
    } catch (e) {
        error = e;
    }

    if (!(error instanceof errorType))
        throw new Error(`Expected ${errorType.name}!`);
}

if (Intl.DurationFormat) {
    shouldBe(new Intl.DurationFormat("fr-FR", { style: "long" }).format({
        hours: 1,
        minutes: 46,
        seconds: 40,
    }), `1 heure, 46 minutes et 40 secondes`);
}