test/jdk/java/lang/String/ToUpperCase.java

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/*
    @test
    @bug 4219630 4304573 4533872 4900935 8042589 8054307
    @summary toUpperCase should upper-case German sharp s correctly even if
             it's the only character in the string. should also uppercase
             all of the 1:M char mappings correctly.  Also it should handle
             Locale specific (lt, tr, and az) uppercasings and supplementary
             characters correctly.
*/

import java.util.Locale;

public class ToUpperCase {

    public static void main(String[] args) {
        Locale turkish = Locale.of("tr", "TR");
        Locale lt = Locale.of("lt"); // Lithanian
        Locale az = Locale.of("az"); // Azeri

        test("\u00DF", turkish, "SS");
        test("a\u00DF", turkish, "ASS");
        test("i", turkish, "\u0130");
        test("i", az, "\u0130");
        test("\u0131", turkish, "I");
        test("\u00DF", Locale.GERMANY, "SS");
        test("a\u00DF", Locale.GERMANY, "ASS");
        test("i", Locale.GERMANY, "I");

        // test some of the 1:M uppercase mappings
        test("abc\u00DF", Locale.US, "ABC\u0053\u0053");
        test("\u0149abc", Locale.US, "\u02BC\u004EABC");
        test("\u0149abc", turkish, "\u02BC\u004EABC");
        test("\u1F52", Locale.US, "\u03A5\u0313\u0300");
        test("\u0149\u1F52", Locale.US, "\u02BC\u004E\u03A5\u0313\u0300");
        test("\u1F54ZZZ", Locale.US, "\u03A5\u0313\u0301ZZZ");
        test("\u1F54ZZZ", turkish, "\u03A5\u0313\u0301ZZZ");
        test("a\u00DF\u1F56", Locale.US, "ASS\u03A5\u0313\u0342");
        test("\u1FAD", turkish, "\u1F6D\u0399");
        test("i\u1FC7", turkish, "\u0130\u0397\u0342\u0399");
        test("i\u1FC7", az, "\u0130\u0397\u0342\u0399");
        test("i\u1FC7", Locale.US, "I\u0397\u0342\u0399");
        test("\uFB04", Locale.US, "\u0046\u0046\u004C");
        test("\uFB17AbCdEfi", turkish, "\u0544\u053DABCDEF\u0130");
        test("\uFB17AbCdEfi", az, "\u0544\u053DABCDEF\u0130");

        // Remove DOT ABOVE after "i" in Lithuanian
        test("i\u0307", lt, "I");
        test("\u0307", lt, "\u0307");
        test("\u0307i", lt, "\u0307I");
        test("j\u0307", lt, "J");
        test("abci\u0307def", lt, "ABCIDEF");
        test("a\u0307", lt, "A\u0307");
        test("abc\u0307def", lt, "ABC\u0307DEF");
        test("i\u0307", Locale.US, "I\u0307");
        test("i\u0307", turkish, "\u0130\u0307");

        // Supplementary character tests
        //
        // U+10400 ("\uD801\uDC00"): DESERET CAPITAL LETTER LONG I
        // U+10401 ("\uD801\uDC01"): DESERET CAPITAL LETTER LONG E
        // U+10402 ("\uD801\uDC02"): DESERET CAPITAL LETTER LONG A
        // U+10428 ("\uD801\uDC28"): DESERET SMALL LETTER LONG I
        // U+10429 ("\uD801\uDC29"): DESERET SMALL LETTER LONG E
        // U+1042A ("\uD801\uDC2A"): DESERET SMALL LETTER LONG A
        //
        // valid code point tests:
        test("\uD801\uDC28\uD801\uDC29\uD801\uDC2A", Locale.US, "\uD801\uDC00\uD801\uDC01\uD801\uDC02");
        test("\uD801\uDC28a\uD801\uDC29b\uD801\uDC2Ac", Locale.US, "\uD801\uDC00A\uD801\uDC01B\uD801\uDC02C");
        // invalid code point tests:
        test("\uD800\uD800\uD801a\uDC00\uDC00\uDC00b", Locale.US, "\uD800\uD800\uD801A\uDC00\uDC00\uDC00B");

        // lower/uppercase + surrogates
        test("a\uD801\uDC44", Locale.ROOT, "A\uD801\uDC1c");
        test("A\uD801\uDC44", Locale.ROOT, "A\uD801\uDC1c");
        test("a\uD801\uDC28\uD801\uDC29\uD801\uDC2A", Locale.US, "A\uD801\uDC00\uD801\uDC01\uD801\uDC02");
        test("A\uD801\uDC28a\uD801\uDC29b\uD801\uDC2Ac", Locale.US, "A\uD801\uDC00A\uD801\uDC01B\uD801\uDC02C");

        // test latin1 only case
        StringBuilder src = new StringBuilder(0x100);
        StringBuilder exp = new StringBuilder(0x100);
        for (int cp = 0; cp < 0x100; cp++) {
            int upperCase = Character.toUpperCase(cp);
            if (upperCase == -1) {    //Character.ERROR
                continue;
            }
            src.appendCodePoint(cp);
            if (cp == '\u00df') {
                exp.append("SS");     // need Character.toUpperCaseEx()
            } else {
                exp.appendCodePoint(upperCase);
            }
        }
        test(src.toString(), Locale.US, exp.toString());

        // test non-latin1 -> latin1
        src = new StringBuilder(0x100).append("ABC");
        exp = new StringBuilder(0x100).append("ABC");
        for (int cp = 0x100; cp < 0x10000; cp++) {
            int upperCase  = Character.toUpperCase(cp);
            if (upperCase < 0x100) {
                src.appendCodePoint(cp);
                exp.appendCodePoint(upperCase);
            }
        }
        test(src.toString(), Locale.US, exp.toString());

    }

    static void test(String in, Locale locale, String expected) {
        test0(in, locale,expected);
        // trigger different code paths
        for (String[] ss :  new String[][] {
                                new String[] {"abc",      "ABC"},
                                new String[] {"AbC",      "ABC"},
                                new String[] {"ABC",      "ABC"},
                                new String[] {"AB\u4e00", "AB\u4e00"},
                                new String[] {"ab\u4e00", "AB\u4e00"},
                                new String[] {"aB\u4e00", "AB\u4e00"},
                                new String[] {"AB\uD800\uDC00", "AB\uD800\uDC00"},
                                new String[] {"Ab\uD800\uDC00", "AB\uD800\uDC00"},
                                new String[] {"ab\uD800\uDC00", "AB\uD800\uDC00"},
                                new String[] {"AB\uD801\uDC44", "AB\uD801\uDC1C"},
                                new String[] {"Ab\uD801\uDC44", "AB\uD801\uDC1C"},
                                new String[] {"ab\uD801\uDC44", "AB\uD801\uDC1C"},
                            }) {
            test0(ss[0] + " " + in, locale, ss[1] + " " + expected);
            test0(in + " " + ss[0], locale, expected + " " + ss[1]);
        }
    }

    static void test0(String in, Locale locale, String expected) {
        String result = in.toUpperCase(locale);
        if (!result.equals(expected)) {
            System.err.println("input: " + in + ", locale: " + locale +
                    ", expected: " + expected + ", actual: " + result);
            throw new RuntimeException();
        }
    }
}