shadowDns.responder = {
      throw IllegalArgumentException("Network.fromNetworkHandle refusing to instantiate NETID_UNSET Network.")
    }

    val dns = AsyncDns.toDns(asyncDns)

    assertFailure {
      dns.lookup("google.invalid")
    }.apply {
      hasMessage("Network.fromNetworkHandle refusing to instantiate NETID_UNSET Network.")
      isInstanceOf(UnknownHostException::class)
    }
  }

import javax.security.cert.X509Certificate

/** An [SSLSession] that delegates all calls.  */
abstract class DelegatingSSLSession(protected val delegate: SSLSession?) : SSLSession {
  override fun getId(): ByteArray {
    return delegate!!.id
  }

  override fun getSessionContext(): SSLSessionContext {
    return delegate!!.sessionContext
  }

  override fun getCreationTime(): Long {

  }

  override fun getCipherSuite(): String {
    throw UnsupportedOperationException()
  }

  override fun getCreationTime(): Long {
    throw UnsupportedOperationException()
  }

  override fun getId(): ByteArray {
    throw UnsupportedOperationException()
  }

  override fun getLastAccessedTime(): Long {
    throw UnsupportedOperationException()
  }

  override fun getLocalCertificates(): Array<Certificate> {