JSTests/stress/intl-numberformat-format-string-v3.js

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function shouldBe(actual, expected) {
    if (actual !== expected)
        throw new Error('bad value: ' + actual + " " + expected);
}

const nf = new Intl.NumberFormat("en-US");
const nf2 = new Intl.NumberFormat("ja-JP");
const string = "987654321987654321";
const string2 = "987654321987654322";
shouldBe(nf.format(string), `987,654,321,987,654,321`);
shouldBe(nf2.format(string), `987,654,321,987,654,321`);
if (nf.formatRange) {
    shouldBe(nf.formatRange(string, string2), `987,654,321,987,654,321–987,654,321,987,654,322`);
    shouldBe(nf2.formatRange(string, string2), `987,654,321,987,654,321～987,654,321,987,654,322`);
}