assertEquals("FFFFFFFF", Hexdump.toHexString(-1L, 8));
        assertEquals("FFFF", Hexdump.toHexString(-1L, 4));
    }

    @Test
    @DisplayName("Should convert byte array to hex string")
    void testToHexStringByteArray() {
        // Note: The implementation has a bug - it ignores the srcIndex parameter!
        // The third parameter is the size of the output string in characters
        // size = number of hex characters to output