v8/test/intl/collator/default-locale.js

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

var collator = new Intl.Collator([]);

var options = collator.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 collatorNone = new Intl.Collator();
assertEquals(options.locale, collatorNone.resolvedOptions().locale);

// TODO(cira): remove support for {} to mean empty list.
var collatorBraket = new Intl.Collator({});
assertEquals(options.locale, collatorBraket.resolvedOptions().locale);

var collatorWithOptions = new Intl.Collator(undefined, {usage: 'search'});
assertEquals(%GetDefaultICULocale() + '-u-co-search',
             collatorWithOptions.resolvedOptions().locale);