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     27 
     28 // Tests String.prototype.localeCompare method override.
     29 
     30 var testData = {
     31   'en': ['blood', 'bull', 'ascend', 'zed', 'down'],
     32   'sr': ['', '', '', '', '', ' ',
     33          '', '', '', ''],
     34   'de': ['Mrz', 'Fue', 'FUSSE', 'Flue', 'Flusse', 'flusse', 'flue',
     35          'fle', 'flsse']
     36 };
     37 
     38 
     39 function testArrays(locale) {
     40   var data;
     41   if (locale === undefined) {
     42     data = testData['en'];
     43     locale = [];
     44   } else {
     45     data = testData[locale];
     46   }
     47 
     48   var collator = new Intl.Collator(locale, options);
     49   var collatorResult = data.sort(collator.compare);
     50   var localeCompareResult = data.sort(function(a, b) {
     51     return a.localeCompare(b, locale, options)
     52   });
     53   assertEquals(collatorResult, localeCompareResult);
     54 }
     55 
     56 
     57 // Defaults
     58 var options = undefined;
     59 testArrays();
     60 
     61 
     62 // Specify locale, keep default options.
     63 options = undefined;
     64 Object.keys(testData).forEach(testArrays);
     65 
     66 
     67 // Specify locale and options.
     68 options = {caseFirst: 'upper'};
     69 Object.keys(testData).forEach(testArrays);
     70