@Test
    void quadruplePatternLetters() {
        assertConvertsSame("AAAA", "AAAA");
        assertConvertsSame("BBBB", "BBBB");
        assertConvertsSame("CCCC", "CCCC");
        assertConvertsSame("oo", "DDDD");
        assertConvertsSame("DD", "EEEE");
        assertConvertsSame("FFFF", "FFFF");
        assertConvertsSame("GGGG", "GGGG");
        assertConvertsSame("HH", "HHHH");
        assertConvertsSame("IIII", "IIII");
        assertConvertsSame("JJJJ", "JJJJ");
        assertConvertsSame("KKKK", "KKKK");
        assertConvertsSame("LLLL", "LLLL");
        assertConvertsSame("MM", "MMMM");
        assertConvertsSame("NNNN", "NNNN");
        assertConvertsSame("OOOO", "OOOO");
        assertConvertsSame("PPPP", "PPPP");
        assertConvertsSame("QQQQ", "QQQQ");
        assertConvertsSame("RRRR", "RRRR");
        assertConvertsSame("l", "SSSS");
        assertConvertsSame("TTTT", "TTTT");
        assertConvertsSame("UUUU", "UUUU");
        assertConvertsSame("VVVV", "VVVV");
        assertConvertsSame("WWWW", "WWWW");
        assertConvertsSame("Z", "XXXX");
        assertConvertsSame("YYYY", "YYYY");
        assertConvertsSame("z", "ZZZZ");

        assertConvertsSame("TT", "aaaa");
        assertConvertsSame("bbbb", "bbbb");
        assertConvertsSame("cccc", "cccc");
        assertConvertsDifferently("dd", "dddd", "dddd");
        assertConvertsSame("eeee", "eeee");
        assertConvertsSame("ffff", "ffff");
        assertConvertsSame("gggg", "gggg");
        assertConvertsSame("hh", "hhhh");
        assertConvertsSame("iiii", "iiii");
        assertConvertsSame("jjjj", "jjjj");
        assertConvertsSame("kkkk", "kkkk");
        assertConvertsSame("llll", "llll");
        assertConvertsSame("mm", "mmmm");
        assertConvertsSame("nnnn", "nnnn");
        assertConvertsSame("oooo", "oooo");
        assertConvertsSame("pppp", "pppp");
        assertConvertsSame("qqqq", "qqqq");
        assertConvertsSame("rrrr", "rrrr");
        assertConvertsSame("ss", "ssss");
        assertConvertsSame("tttt", "tttt");
        assertConvertsSame("yy", "uuuu");
        assertConvertsSame("vvvv", "vvvv");
        assertConvertsSame("wwww", "wwww");
        assertConvertsSame("xxxx", "xxxx");
        assertConvertsSame("yy", "yyyy");
        assertConvertsDifferently("z", "zzzz", "zzzz");
    }
Test the Java date time pattern to jquery UI pattern conversion
{@link DateTimePatternConverter}.
primefaces/src/test/java/org/primefaces/convert/DateTimePatternConverterTest.java