CancellationException e = assertThrows(CancellationException.class, () -> future.get());
    assertThat(e.getCause()).isNotNull();
  }

  public void testCancel_notDoneInterrupt() throws Exception {
    Future<?> future = newFutureInstance();
    assertTrue(future.cancel(true));
    assertTrue(future.isCancelled());
    assertTrue(future.isDone());