v8/test/intl/date-format/default-locale.js

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// Constructing DateTimeFormat with no locale arguments or with []
// creates one with default locale.

var dtf = new Intl.DateTimeFormat([]);

var options = dtf.resolvedOptions();

// Check it's none of these first.
assertFalse(options.locale === 'und');
assertFalse(options.locale === '');
assertFalse(options.locale === undefined);

// Then check for equality.
assertEquals(options.locale, %GetDefaultICULocale());

var dtfNone = new Intl.DateTimeFormat();
assertEquals(options.locale, dtfNone.resolvedOptions().locale);