src/v8/test/intl/general/mapped-locale.js

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// Make sure that zh locales map properly, i.e. don't map zh-TW to zh.

var nf = Intl.NumberFormat(['zh-TW'], {localeMatcher: 'lookup'});
assertEquals('zh-TW', nf.resolvedOptions().locale);

var nf = Intl.NumberFormat(['zh-Hant-TW'], {localeMatcher: 'lookup'});
assertEquals('zh-Hant-TW', nf.resolvedOptions().locale);

var nf = Intl.NumberFormat(['zh-Hant'], {localeMatcher: 'lookup'});
assertEquals('zh-Hant', nf.resolvedOptions().locale);

nf = Intl.NumberFormat(['zh'], {localeMatcher: 'lookup'});
assertEquals('zh', nf.resolvedOptions().locale);

nf = Intl.NumberFormat(['zh-CN'], {localeMatcher: 'lookup'});
assertEquals('zh-CN', nf.resolvedOptions().locale);

nf = Intl.NumberFormat(['zh-Hans-CN'], {localeMatcher: 'lookup'});
assertEquals('zh-Hans-CN', nf.resolvedOptions().locale);

nf = Intl.NumberFormat(['zh-Hans'], {localeMatcher: 'lookup'});
assertEquals('zh-Hans', nf.resolvedOptions().locale);

nf = Intl.NumberFormat(['en-US'], {localeMatcher: 'lookup'});
assertEquals('en-US', nf.resolvedOptions().locale);