JSTests/test262/test/intl402/9.2.1_8_c_vi.js

// Copyright 2012 Mozilla Corporation. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
es5id: 9.2.1_8_c_vi
description: >
    Tests that canonicalization of locale lists removes duplicate
    language tags.
author: Norbert Lindenberg
includes: [testIntl.js]
---*/

testWithIntlConstructors(function (Constructor) {
    var defaultLocale = new Constructor().resolvedOptions().locale;
    var canonicalized = Constructor.supportedLocalesOf([defaultLocale, defaultLocale]);
    if (canonicalized.length > 1) {
        $ERROR("Canonicalization didn't remove duplicate language tags from locale list.");
    }
});