@Test
  public void whenAborted() throws InterruptedException {
    barrier = new VetoCommitBarrier();
    barrier.abort();

    boolean success = barrier.tryAwaitOpen(1, TimeUnit.DAYS);
    assertTrue(barrier.isAborted());
    assertTrue(success);
  }
  @Test
  public void whenBarrierAborted_thenCommitBarrierOpenException() {
    VetoCommitBarrier barrier = new VetoCommitBarrier();
    barrier.abort();

    try {
      barrier.vetoCommit();
      fail();
    } catch (CommitBarrierOpenException expected) {
    }
    assertTrue(barrier.isAborted());
  }