mgr.beginUpdate() ;
Block block = mgr.allocate(4) ;
ByteBuffer bb = block.getByteBuffer() ;
bb.putInt(0,1234) ;
mgr.write(block) ;
mgr.release(block) ;
// -----
Block block2 = mgr.getRead(block.getId()) ;
ByteBuffer bb2 = block2.getByteBuffer() ;
assertArrayEquals(bb.array(), bb2.array()) ;
mgr.release(block2) ;