assertThat(listener.recordedEventTypes().filter { it == "ConnectFailed" }).hasSize(0)
  }

  @Test
  fun callIpv6WhenBothServersAreReachable() {
    // Flip DNS results to prefer IPv6.
    dnsResults =
      listOf(
        localhostIpv6,
        localhostIpv4,
      )
    serverIpv4.enqueue(
      MockResponse(body = "unexpected call to IPv4"),
    )

            request: UrlRequest,
            info: UrlResponseInfo,
            byteBuffer: ByteBuffer,
          ) {
            println("onReadCompleted ${info.headers.asMap}")
            byteBuffer.flip()
            buffer.write(byteBuffer)
            byteBuffer.clear()
            request.read(byteBuffer)
          }

          override fun onSucceeded(
            request: UrlRequest,