Can I MPI_Test for an Ibarrier

Question

In this code, all processes post a barrier, sleep a while for good measure, then first Test and then Wait for the barrier. The Test says no and the wait succeeds. A test should be like a non-blocking wait, so it should succeed. What am I missing?

  printf("[%d] posting barrier, then sleeping\n",procid);
  MPI_Request final_barrier;
  MPI_Ibarrier(comm,&final_barrier);
  sleep(2);

  int all_done_flag=0;
  MPI_Test(&final_barrier,&all_done_flag,MPI_STATUS_IGNORE);
  printf("[%d] all done: %d\n",procid,all_done_flag);

  MPI_Wait(&final_barrier,MPI_STATUS_IGNORE);
  printf("[%d] concluded\n",procid);