assertFalse(future.interruptTaskWasCalled);
    CancellationException e = assertThrows(CancellationException.class, () -> future.get());
    assertThat(e).hasCauseThat().isNull();
  }

  public void testCancel_notDoneInterrupt() throws Exception {
    InterruptibleFuture future = new InterruptibleFuture();
    assertTrue(future.cancel(true));
    assertTrue(future.isCancelled());
    assertTrue(future.isDone());