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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
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// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
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//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Tests the new String.prototype.normalize method.


// Common use case when searching for 'not very exact' match.
// These are examples of data one might encounter in real use.

load("testsrc/assert.js");

assertEquals(0, String.prototype.normalize.length);

// Vietnamese legacy text, old Windows 9x / non-Unicode applications use
// windows-1258 code page, which is neither precomposed, nor decomposed.
assertEquals('ti\u00ea\u0301ng Vi\u00ea\u0323t'.normalize('NFKD'),
    'ti\u1ebfng Vi\u1ec7t'.normalize('NFKD')); // all precomposed

// Various kinds of spaces
assertEquals('Google\u0020Maps'.normalize('NFKD'), // normal space
    'Google\u00a0Maps'.normalize('NFKD')); // non-breaking space
assertEquals('Google\u0020Maps'.normalize('NFKD'), // normal space
    'Google\u2002Maps'.normalize('NFKD')); // en-space
assertEquals('Google\u0020Maps'.normalize('NFKD'), // normal space
    'Google\u2003Maps'.normalize('NFKD')); // em-space
assertEquals('Google\u0020Maps'.normalize('NFKD'), // normal space
    'Google\u3000Maps'.normalize('NFKC')); // ideographic space

// Latin small ligature "fi"
assertEquals('fi'.normalize('NFKD'), '\ufb01'.normalize('NFKD'));

// ŀ, Latin small L with middle dot, used in Catalan and often represented
// as decomposed for non-Unicode environments ( l + ·)
assertEquals('l\u00b7'.normalize('NFKD'), '\u0140'.normalize('NFKD'));

// Legacy text, Japanese narrow Kana (MS-DOS & Win 3.x time)
assertEquals('\u30d1\u30bd\u30b3\u30f3'.normalize('NFKD'), // パソコン  :  wide
    '\uff8a\uff9f\uff7f\uff7a\uff9d'.normalize('NFKD')); // ﾊﾟｿｺﾝ  :  narrow
// Also for Japanese, Latin fullwidth forms vs. ASCII
assertEquals('ABCD'.normalize('NFKD'),
    '\uff21\uff22\uff23\uff24'.normalize('NFKD')); // ＡＢＣＤ, fullwidth


// Make sure we throw RangeError, as the standard requires.
assertThrows('"".normalize(1234)', RangeError);
assertThrows('"".normalize("BAD")', RangeError);

// The standard does not say what kind of exceptions we should throw, so we
// will not be specific. But we still test that we throw errors.
assertThrows('s.normalize()'); // s is not defined
assertThrows('var s = null; s.normalize()');
assertThrows('var s = undefined; s.normalize()');
assertThrows('var s = 1234; s.normalize()'); // no normalize for non-strings


// Several kinds of mappings. No need to be comprehensive, we don't test
// the ICU functionality, we only test C - JavaScript 'glue'
var testData = [
    // org, default, NFC, NFD, NKFC, NKFD
    ['\u00c7', // Ç : Combining sequence, Latin 1
        '\u00c7', '\u0043\u0327',
        '\u00c7', '\u0043\u0327'],
    ['\u0218', // Ș : Combining sequence, non-Latin 1
        '\u0218', '\u0053\u0326',
        '\u0218', '\u0053\u0326'],
    ['\uac00', // 가 : Hangul
        '\uac00', '\u1100\u1161',
        '\uac00', '\u1100\u1161'],
    ['\uff76', // ｶ : Narrow Kana
        '\uff76', '\uff76',
        '\u30ab', '\u30ab'],
    ['\u00bc', // ¼ : Fractions
        '\u00bc', '\u00bc',
        '\u0031\u2044\u0034', '\u0031\u2044\u0034'],
    ['\u01c6', // ǆ  : Latin ligature
        '\u01c6', '\u01c6',
        '\u0064\u017e', '\u0064\u007a\u030c'],
    ['s\u0307\u0323', // s + dot above + dot below, ordering of combining marks
        '\u1e69', 's\u0323\u0307',
        '\u1e69', 's\u0323\u0307'],
    ['\u3300', // ㌀ : Squared characters
        '\u3300', '\u3300',
        '\u30a2\u30d1\u30fc\u30c8', // アパート
        '\u30a2\u30cf\u309a\u30fc\u30c8'], // アパート
    ['\ufe37', // ︷ : Vertical forms
        '\ufe37', '\ufe37',
        '{' , '{'],
    ['\u2079', // ⁹ : superscript 9
        '\u2079', '\u2079',
        '9', '9'],
    ['\ufee5\ufee6\ufee7\ufee8', // Arabic forms
        '\ufee5\ufee6\ufee7\ufee8', '\ufee5\ufee6\ufee7\ufee8',
        '\u0646\u0646\u0646\u0646', '\u0646\u0646\u0646\u0646'],
    ['\u2460', // ① : Circled
        '\u2460', '\u2460',
        '1', '1'],
    ['\u210c', // ℌ : Font variants
        '\u210c', '\u210c',
        'H', 'H'],
    ['\u2126', // Ω : Singleton, OHM sign vs. Greek capital letter OMEGA
        '\u03a9', '\u03a9',
        '\u03a9', '\u03a9'],
    ['\ufdfb', // Long ligature, ARABIC LIGATURE JALLAJALALOUHOU
        '\ufdfb', '\ufdfb',
        '\u062C\u0644\u0020\u062C\u0644\u0627\u0644\u0647',
        '\u062C\u0644\u0020\u062C\u0644\u0627\u0644\u0647']
];

var kNFC = 1, kNFD = 2, kNFKC = 3, kNFKD = 4;
for (var i = 0; i < testData.length; ++i) {
    // the original, NFC and NFD should normalize to the same thing
    for (var column = 0; column < 3; ++column) {
        var str = testData[i][column];
        assertEquals(str.normalize(), testData[i][kNFC]); // defaults to NFC
        assertEquals(str.normalize('NFC'), testData[i][kNFC]);
        assertEquals(str.normalize('NFD'), testData[i][kNFD]);
        assertEquals(str.normalize('NFKC'), testData[i][kNFKC]);
        assertEquals(str.normalize('NFKD'), testData[i][kNFKD]);
    }
}

"success"