上代码：

scala">import org.scalatest.funsuite.AnyFunSuite
import java.util.concurrent.{ExecutorService, Executors, TimeUnit}

class ExecutorPoolTest extends AnyFunSuite {
  val threadPool: ExecutorService = Executors.newFixedThreadPool(1)

  val job: Runnable = new Runnable {
    @volatile var stop = false

    override def run(): Unit = {
      while (!stop) {
        try {
          println(s"Runnable is working, ${System.currentTimeMillis()}")
          Thread.sleep(1000)
        } catch {
          case i: InterruptedException => {
            println("Runnable encounter interrupt!")
            stop = true
          }
          case other =>
        }
      }
    }
  }


  def stopPool():Unit={
    println("ready to shutdown thread pool!")
    threadPool.shutdown()
    if (!threadPool.awaitTermination(10, TimeUnit.SECONDS)) {
      println("ready to force shutting down thread pool!")
      threadPool.shutdownNow()
    }
  }

  test("test-shutdown") {

    threadPool.execute(job)
    Thread.sleep(5000)
    stopPool()

    while (true) {
      println("main thread is still running!")
      Thread.sleep(3000)
    }
  }
}

参考文章：

如何优雅的停止线程（池）
如何优雅地停止一个线程？
ExecutorService 线程池详解
ExecutorsService.submit详解
ExecutorService的invokeAll方法详解