assertEquals('A', Hexdump.HEX_DIGITS[10]);
        assertEquals('F', Hexdump.HEX_DIGITS[15]);
    }

    @Test
    @DisplayName("Should handle edge cases in toHexChars")
    void testToHexCharsEdgeCases() {
        // Test with zero
        char[] dst1 = new char[4];
        java.util.Arrays.fill(dst1, 'X');
        Hexdump.toHexChars(0, dst1, 0, 4);
        assertEquals("0000", new String(dst1));