### Question:
ByteBufList extends AbstractReferenceCounted { public static ByteBufList clone(ByteBufList other) { ByteBufList buf = get(); for (int i = 0; i < other.buffers.size(); i++) { buf.add(other.buffers.get(i).retainedDuplicate()); } return buf; } private  ByteBufList(Handle<ByteBufList> recyclerHandle); static ByteBufList get(ByteBuf b1, ByteBuf b2); static ByteBufList get(ByteBuf b1); static ByteBufList clone(ByteBufList other); void add(ByteBuf buf); void prepend(ByteBuf buf); int readableBytes(); ByteBuf getBuffer(int index); int size(); int getBytes(byte[] dst); byte[] toArray(); boolean hasArray(); byte[] array(); int arrayOffset(); @VisibleForTesting static ByteBuf coalesce(ByteBufList list); @Override ByteBufList retain(); @Override ReferenceCounted touch(Object hint); static final Encoder ENCODER; static final Encoder ENCODER_WITH_SIZE; }### Answer:
@Test public void testClone() throws Exception { ByteBuf b1 = PooledByteBufAllocator.DEFAULT.heapBuffer(128, 128); b1.writerIndex(b1.capacity()); ByteBuf b2 = PooledByteBufAllocator.DEFAULT.heapBuffer(128, 128); b2.writerIndex(b2.capacity()); ByteBufList buf = ByteBufList.get(b1, b2); ByteBufList clone = ByteBufList.clone(buf); assertEquals(2, buf.size()); assertEquals(256, buf.readableBytes()); assertEquals(b1, buf.getBuffer(0)); assertEquals(b2, buf.getBuffer(1)); assertEquals(2, clone.size()); assertEquals(256, clone.readableBytes()); assertEquals(b1, clone.getBuffer(0)); assertEquals(b2, clone.getBuffer(1)); assertEquals(buf.refCnt(), 1); assertEquals(clone.refCnt(), 1); assertEquals(b1.refCnt(), 2); assertEquals(b2.refCnt(), 2); buf.release(); assertEquals(buf.refCnt(), 0); assertEquals(clone.refCnt(), 1); assertEquals(b1.refCnt(), 1); assertEquals(b2.refCnt(), 1); clone.release(); assertEquals(buf.refCnt(), 0); assertEquals(clone.refCnt(), 0); assertEquals(b1.refCnt(), 0); assertEquals(b2.refCnt(), 0); }