application.addDelayedShutdownHook(service, 2, TimeUnit.SECONDS);
    verify(service, Mockito.never()).shutdown();
    application.shutdown();
    InOrder shutdownFirst = Mockito.inOrder(service);
    shutdownFirst.verify(service).shutdown();
    shutdownFirst.verify(service).awaitTermination(2, TimeUnit.SECONDS);
  }

 * the "running" state need to perform a periodic task. Subclasses can implement {@link #startUp},
 * {@link #shutDown} and also a {@link #runOneIteration} method that will be executed periodically.
 *
 * <p>This class uses the {@link ScheduledExecutorService} returned from {@link #executor} to run
 * the {@link #startUp} and {@link #shutDown} methods and also uses that service to schedule the

    private final Object lock = new Object();

    /*
     * Conceptually, these two variables describe the executor being in
     * one of three states:
     *   - Active: shutdown == false
     *   - Shutdown: runningTasks > 0 and shutdown == true
     *   - Terminated: runningTasks == 0 and shutdown == true
     */
    @GuardedBy("lock")

                while ( !this.started ) {
                    this.startedLock.wait();
                }
            }
        }


        public void shutdown () {
            this.shutdown = true;
            synchronized ( this.shutdownLock ) {
                this.shutdownLock.notify();
            }
        }


        /**
         * {@inheritDoc}
         *

    application.addDelayedShutdownHook(service, 2, TimeUnit.SECONDS);
    verify(service, Mockito.never()).shutdown();
    application.shutdown();
    InOrder shutdownFirst = Mockito.inOrder(service);
    shutdownFirst.verify(service).shutdown();
    shutdownFirst.verify(service).awaitTermination(2, TimeUnit.SECONDS);
  }

    assertFalse(testExecutor.isTerminated());
    mock.assertLastMethodCalled("isTerminated");
    assertFalse(testExecutor.isShutdown());
    mock.assertLastMethodCalled("isShutdown");
    testExecutor.shutdown();
    mock.assertLastMethodCalled("shutdown");
    List<Runnable> list = testExecutor.shutdownNow();
    mock.assertLastMethodCalled("shutdownNow");
    assertEquals(ImmutableList.of(), list);
  }

    assertFalse(testExecutor.isTerminated());
    mock.assertLastMethodCalled("isTerminated");
    assertFalse(testExecutor.isShutdown());
    mock.assertLastMethodCalled("isShutdown");
    testExecutor.shutdown();
    mock.assertLastMethodCalled("shutdown");
    List<Runnable> list = testExecutor.shutdownNow();
    mock.assertLastMethodCalled("shutdownNow");
    assertEquals(ImmutableList.of(), list);
  }

        .build()
    url =
      serverIpv4.url("/")
        .newBuilder()
        .host("localhost")
        .build()
  }

  @AfterEach
  internal fun tearDown() {
    serverIpv4.shutdown()
    serverIpv6.shutdown()
  }

  @Test
  fun callIpv6FirstEvenWhenIpv4IpIsListedFirst() {
    dnsResults =
      listOf(
        localhostIpv4,
        localhostIpv6,
      )
    serverIpv4.enqueue(

  @Test
  fun shutdownWithoutStart() {
    val server = MockWebServer()
    server.shutdown()
  }

  @Test
  fun closeViaClosable() {
    val server: Closeable = MockWebServer()
    server.close()
  }

  @Test
  fun shutdownWithoutEnqueue() {
    val server = MockWebServer()
    server.start()
    server.shutdown()
  }

  @Test
  fun portImplicitlyStarts() {

    server2.start()
    server2.start()
    server2.shutdown()
  }

  @Test
  fun shutdownTwice() {
    val server2 = MockWebServer()
    server2.start()
    server2.shutdown()
    try {
      server2.start()
      fail<Unit>()
    } catch (expected: IllegalStateException) {
      // Expected.
    }
    server2.shutdown()
  }