}

    static TestCondition createAndSignalAfter(long delay, TimeUnit unit) {
      final TestCondition testCondition = create();

      ScheduledExecutorService scheduledPool = Executors.newScheduledThreadPool(1);
      // If signal() fails somehow, we should see a failed test, even without looking at the Future.
      Future<?> unused =
          scheduledPool.schedule(
              new Runnable() {