@Test
    void quintuplePatternLetters() {
        assertConvertsSame("AAAAA", "AAAAA");
        assertConvertsSame("BBBBB", "BBBBB");
        assertConvertsSame("CCCCC", "CCCCC");
        assertConvertsSame("oo", "DDDDD");
        assertConvertsSame("DD", "EEEEE");
        assertConvertsSame("FFFFF", "FFFFF");
        assertConvertsSame("GGGGG", "GGGGG");
        assertConvertsSame("HH", "HHHHH");
        assertConvertsSame("IIIII", "IIIII");
        assertConvertsSame("JJJJJ", "JJJJJ");
        assertConvertsSame("KKKKK", "KKKKK");
        assertConvertsSame("LLLLL", "LLLLL");
        assertConvertsSame("MM", "MMMMM");
        assertConvertsSame("NNNNN", "NNNNN");
        assertConvertsSame("OOOOO", "OOOOO");
        assertConvertsSame("PPPPP", "PPPPP");
        assertConvertsSame("QQQQQ", "QQQQQ");
        assertConvertsSame("RRRRR", "RRRRR");
        assertConvertsSame("l", "SSSSS");
        assertConvertsSame("TTTTT", "TTTTT");
        assertConvertsSame("UUUUU", "UUUUU");
        assertConvertsSame("VVVVV", "VVVVV");
        assertConvertsSame("WWWWW", "WWWWW");
        assertConvertsSame("Z", "XXXXX");
        assertConvertsSame("YYYYY", "YYYYY");
        assertConvertsSame("z", "ZZZZZ");

        assertConvertsSame("TT", "aaaaa");
        assertConvertsSame("bbbbb", "bbbbb");
        assertConvertsSame("ccccc", "ccccc");
        assertConvertsDifferently("dd", "ddddd", "ddddd");
        assertConvertsSame("eeeee", "eeeee");
        assertConvertsSame("fffff", "fffff");
        assertConvertsSame("ggggg", "ggggg");
        assertConvertsSame("hh", "hhhhh");
        assertConvertsSame("iiiii", "iiiii");
        assertConvertsSame("jjjjj", "jjjjj");
        assertConvertsSame("kkkkk", "kkkkk");
        assertConvertsSame("lllll", "lllll");
        assertConvertsSame("mm", "mmmmm");
        assertConvertsSame("nnnnn", "nnnnn");
        assertConvertsSame("ooooo", "ooooo");
        assertConvertsSame("ppppp", "ppppp");
        assertConvertsSame("qqqqq", "qqqqq");
        assertConvertsSame("rrrrr", "rrrrr");
        assertConvertsSame("ss", "sssss");
        assertConvertsSame("ttttt", "ttttt");
        assertConvertsDifferently("yy", "yyu", "uuuuu");
        assertConvertsSame("vvvvv", "vvvvv");
        assertConvertsSame("wwwww", "wwwww");
        assertConvertsSame("xxxxx", "xxxxx");
        assertConvertsSame("yy", "yyyyy");
        assertConvertsDifferently("z", "zzzzz", "zzzzz");
    }
Test the Java date time pattern to jquery UI pattern conversion
{@link DateTimePatternConverter}.
primefaces/src/test/java/org/primefaces/convert/DateTimePatternConverterTest.java