attempts.await()
    synchronized(webSockets) {
      for (webSocket in webSockets) {
        webSocket.cancel()
      }
    }
  }

  @Test
  @Throws(Exception::class)
  fun compressedMessages() {
    successfulExtensions("permessage-deflate")
  }

  @Test
  @Throws(Exception::class)
  fun compressedMessagesNoClientContextTakeover() {