@Override
    public ByteBuffer[] nioBuffers() {
        return nioBuffers(readerIndex, readableBytes());
    }
@Test
    public void testNioBuffersAfterRelease() {
        assertThrows(IllegalReferenceCountException.class, new Executable() {
            @Override
            public void execute() {
                releasedBuffer().nioBuffers();
            }
        });
    }