@Override
        public void run() {
          try {
            longOp();
          } catch (InterruptedException e) {
            e.printStackTrace();
          }
        }
Tests that when unbounded queue provided to executor, only
{@link ThreadPoolExecutor#getCorePoolSize()} threads are launched

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