@Override
    public short getUnsignedByte(int index) {
        return (short) (getByte(index) & 0xFF);
    }
@Test
    public void testGetUnsignedByteAfterRelease() {
        assertThrows(IllegalReferenceCountException.class, new Executable() {
            @Override
            public void execute() {
                releasedBuffer().getUnsignedByte(0);
            }
        });
    }