@Override
        public void run() {
          try {
            longOp();
          } catch (InterruptedException e) {
            e.printStackTrace();
          }
        }
Tests that when load is more than core-pool-size and less than
max-pool-size, the number of threads scales up.

@throws InterruptedException
ambari-server/src/test/java/org/apache/ambari/server/controller/test/BufferedThreadPoolExecutorCompletionServiceTest.java