stream.readTimeout().timeout(500, TimeUnit.MILLISECONDS)
    val source = stream.getSource().buffer()
    source.require(3)
    val startNanos = System.nanoTime()
    assertFailsWith<InterruptedIOException> {
      source.require(4)
    }
    val elapsedNanos = System.nanoTime() - startNanos
    awaitWatchdogIdle()
    // 200ms delta