return "value";
                  }
                }),
            executor);
    ListenableFuture<?> statusFuture = closingFuture.statusFuture();
    waiter.awaitStarted();
    assertThat(statusFuture.isDone()).isFalse();
    statusFuture.cancel(true);
    assertThat(statusFuture.isCancelled()).isTrue();
    waiter.awaitReturned();
    assertThat(getFinalValue(closingFuture)).isEqualTo("value");
  }