cache.getUnchecked(s);
      expectedKeys.add(s);
    }
    computationShouldWait.set(true);

    final AtomicInteger computedCount = new AtomicInteger();
    ExecutorService threadPool = Executors.newFixedThreadPool(nThreads);
    final CountDownLatch tasksFinished = new CountDownLatch(nTasks);
    for (int i = 0; i < nTasks; i++) {
      final String s = "a" + i;

      cache.getUnchecked(s);
      expectedKeys.add(s);
    }
    computationShouldWait.set(true);

    final AtomicInteger computedCount = new AtomicInteger();
    ExecutorService threadPool = Executors.newFixedThreadPool(nThreads);
    final CountDownLatch tasksFinished = new CountDownLatch(nTasks);
    for (int i = 0; i < nTasks; i++) {
      final String s = "a" + i;