@Test
    void singlePatternLetters() {
        assertConvertsSame("A", "A");
        assertConvertsSame("B", "B");
        assertConvertsSame("C", "C");
        assertConvertsSame("o", "D");
        assertConvertsDifferently("D", "E", "E");
        assertConvertsSame("F", "F");
        assertConvertsSame("G", "G");
        assertConvertsSame("H", "H");
        assertConvertsSame("I", "I");
        assertConvertsSame("J", "J");
        assertConvertsSame("K", "K");
        assertConvertsSame("L", "L");
        assertConvertsSame("m", "M");
        assertConvertsSame("N", "N");
        assertConvertsSame("O", "O");
        assertConvertsSame("P", "P");
        assertConvertsSame("Q", "Q");
        assertConvertsSame("R", "R");
        assertConvertsDifferently("l", "S", "S");
        assertConvertsSame("T", "T");
        assertConvertsSame("U", "U");
        assertConvertsSame("V", "V");
        assertConvertsSame("W", "W");
        assertConvertsDifferently("z", "X", "X");
        assertConvertsSame("Y", "Y");
        assertConvertsSame("z", "Z");

        assertConvertsSame("TT", "a");
        assertConvertsSame("b", "b");
        assertConvertsSame("c", "c");
        assertConvertsSame("d", "d");
        assertConvertsSame("e", "e");
        assertConvertsSame("f", "f");
        assertConvertsSame("g", "g");
        assertConvertsSame("h", "h");
        assertConvertsSame("i", "i");
        assertConvertsSame("j", "j");
        assertConvertsSame("k", "k");
        assertConvertsSame("l", "l");
        assertConvertsSame("m", "m");
        assertConvertsSame("n", "n");
        assertConvertsSame("o", "o");
        assertConvertsSame("p", "p");
        assertConvertsSame("q", "q");
        assertConvertsSame("r", "r");
        assertConvertsSame("s", "s");
        assertConvertsSame("t", "t");
        assertConvertsDifferently("yy", "u", "u");
        assertConvertsSame("v", "v");
        assertConvertsSame("w", "w");
        assertConvertsSame("x", "x");
        assertConvertsDifferently("yy", "y", "y");
        assertConvertsSame("z", "z");
    }
Test the Java date time pattern to jquery UI pattern conversion
{@link DateTimePatternConverter}.
primefaces/src/test/java/org/primefaces/convert/DateTimePatternConverterTest.java