return@schedule delays.removeAt(0)
    }

    taskFaker.advanceUntil(0.µs)
    assertThat(log).containsExactly()

    taskFaker.advanceUntil(100.µs)
    assertThat(log).containsExactly("run@100000")

    taskFaker.advanceUntil(150.µs)
    assertThat(log).containsExactly("run@100000", "run@150000")

    taskFaker.advanceUntil(299.µs)
    assertThat(log).containsExactly("run@100000", "run@150000")

  fun pingOnInterval() {
    client.initWebSocket(random, pingIntervalMillis = 500)
    taskFaker.advanceUntil(ns(500L))
    server.processNextFrame() // Ping.
    client.processNextFrame() // Pong.
    taskFaker.advanceUntil(ns(1000L))
    server.processNextFrame() // Ping.
    client.processNextFrame() // Pong.
    taskFaker.advanceUntil(ns(1500L))
    server.processNextFrame() // Ping.
    client.processNextFrame() // Pong.
  }

    assertEvents(
      "plan 1 TCP connect failed",
    )

    taskFaker.advanceUntil(530.ms)
    assertEvents(
      "plan 2 TCP connect failed",
      "take plan 3",
      "plan 3 TCP connecting...",
    )

    taskFaker.advanceUntil(780.ms)
    assertEvents(
      "take plan 4",
      "plan 4 TCP connecting...",
    )

    taskFaker.advanceUntil(790.ms)

      },
      logger = logger,
    )

  /** Runs all tasks that are ready. Used by the test thread only. */
  fun runTasks() {
    advanceUntil(nanoTime)
  }

  /** Advance the simulated clock, then runs tasks that are ready. Used by the test thread only. */
  fun advanceUntil(newTime: Long) {
    taskRunner.assertLockNotHeld()

    taskRunner.withLock {
      check(currentTask == TestThreadSerialTask)

    for (t in taskRunnerThreads) {
      t.interrupt()
    }
    Thread.sleep(100)
    assertThat(taskRunner.activeQueues()).isEmpty()
  }

  @Test fun connectionPreWarmingHttp1() {
    taskFaker.advanceUntil(System.nanoTime())
    val expireTime = taskFaker.nanoTime + 1_000_000_000_000

    routePlanner.autoGeneratePlans = true
    routePlanner.defaultConnectionIdleAtNanos = expireTime