assertEquals("XXFFXXXXXX", new String(dst3));

        // Test long conversion
        char[] dst4 = new char[16];
        Hexdump.toHexChars(0x123456789ABCDEF0L, dst4, 0, 16);
        assertEquals("123456789ABCDEF0", new String(dst4));
    }

    @Test
    @DisplayName("Should verify HEX_DIGITS constant")
    void testHexDigitsConstant() {
        // Verify the HEX_DIGITS array contains correct values