@Test
    void triplePatternLetters() {
        assertConvertsSame("AAA", "AAA");
        assertConvertsSame("BBB", "BBB");
        assertConvertsSame("CCC", "CCC");
        assertConvertsSame("oo", "DDD");
        assertConvertsSame("D", "EEE");
        assertConvertsSame("FFF", "FFF");
        assertConvertsSame("GGG", "GGG");
        assertConvertsSame("HH", "HHH");
        assertConvertsSame("III", "III");
        assertConvertsSame("JJJ", "JJJ");
        assertConvertsSame("KKK", "KKK");
        assertConvertsSame("LLL", "LLL");
        assertConvertsSame("M", "MMM");
        assertConvertsSame("NNN", "NNN");
        assertConvertsSame("OOO", "OOO");
        assertConvertsSame("PPP", "PPP");
        assertConvertsSame("QQQ", "QQQ");
        assertConvertsSame("RRR", "RRR");
        assertConvertsSame("l", "SSS");
        assertConvertsSame("TTT", "TTT");
        assertConvertsSame("UUU", "UUU");
        assertConvertsSame("VVV", "VVV");
        assertConvertsSame("WWW", "WWW");
        assertConvertsSame("Z", "XXX");
        assertConvertsSame("YYY", "YYY");
        assertConvertsSame("z", "ZZZ");

        assertConvertsSame("TT", "aaa");
        assertConvertsSame("bbb", "bbb");
        assertConvertsSame("ccc", "ccc");
        assertConvertsDifferently("dd", "ddd", "ddd");
        assertConvertsSame("eee", "eee");
        assertConvertsSame("fff", "fff");
        assertConvertsSame("ggg", "ggg");
        assertConvertsSame("hh", "hhh");
        assertConvertsSame("iii", "iii");
        assertConvertsSame("jjj", "jjj");
        assertConvertsSame("kkk", "kkk");
        assertConvertsSame("lll", "lll");
        assertConvertsSame("mm", "mmm");
        assertConvertsSame("nnn", "nnn");
        assertConvertsSame("ooo", "ooo");
        assertConvertsSame("ppp", "ppp");
        assertConvertsSame("qqq", "qqq");
        assertConvertsSame("rrr", "rrr");
        assertConvertsSame("ss", "sss");
        assertConvertsSame("ttt", "ttt");
        assertConvertsDifferently("yy", "yu", "uuu");
        assertConvertsSame("vvv", "vvv");
        assertConvertsSame("www", "www");
        assertConvertsSame("xxx", "xxx");
        assertConvertsSame("yy", "yyy");
        assertConvertsDifferently("z", "zzz", "zzz");
    }
Test the Java date time pattern to jquery UI pattern conversion
{@link DateTimePatternConverter}.
primefaces/src/test/java/org/primefaces/convert/DateTimePatternConverterTest.java