server.send("abc")
    clientListener.assertTextMessage("abc")
    closeWebSockets(webSocket, server)
  }

  @Test
  @Throws(Exception::class)
  fun clientPingsServerOnInterval() {
    client =
      client.newBuilder()
        .pingInterval(Duration.ofMillis(500))
        .build()
    webServer.enqueue(
      MockResponse.Builder()
        .webSocketUpgrade(serverListener)