val rootCa =
      HeldCertificate.Builder()
        .serialNumber(1L)
        .certificateAuthority(1)
        .commonName("root")
        .build()
    val intermediateCa =
      HeldCertificate.Builder()
        .signedBy(rootCa)
        .certificateAuthority(0)
        .serialNumber(2L)
        .commonName("intermediate_ca")
        .build()
    val certificate =
      HeldCertificate.Builder()

        .serialNumber(1L)
        .certificateAuthority(1)
        .commonName("root")
        .addSubjectAlternativeName("root_ca.com")
        .build()
    serverIntermediateCa =
      HeldCertificate.Builder()
        .signedBy(serverRootCa)
        .certificateAuthority(0)
        .serialNumber(2L)
        .commonName("intermediate_ca")
        .addSubjectAlternativeName("intermediate_ca.com")
        .build()

     * [addSubjectAlternativeName]. If unset a random string will be used.
     *
     * [rfc_2818]: https://tools.ietf.org/html/rfc2818
     */
    fun commonName(cn: String) =
      apply {
        this.commonName = cn
      }

    /** Sets the certificate's organizational unit (OU). If unset this field will be omitted. */
    fun organizationalUnit(ou: String) =
      apply {

      listOf(GeneralName.iPAddress, "1.1.1.1"),
      listOf(GeneralName.dNSName, "cash.app"),
    )
  }

  @Test
  fun commonName() {
    val heldCertificate =
      HeldCertificate.Builder()
        .commonName("cash.app")
        .build()
    val certificate = heldCertificate.certificate
    assertThat(certificate.getSubjectX500Principal().name).isEqualTo("CN=cash.app")
  }

  val tbsCertificate: TbsCertificate,
  val signatureAlgorithm: AlgorithmIdentifier,
  val signatureValue: BitString,
) {
  val commonName: Any?
    get() {
      return tbsCertificate.subject
        .flatten()
        .firstOrNull { it.type == ObjectIdentifiers.COMMON_NAME }
        ?.value
    }

  val organizationalUnitName: Any?
    get() {
      return tbsCertificate.subject
        .flatten()

   * Host header).
   */
  @Test
  fun domainFronting() {
    val heldCertificate =
      HeldCertificate.Builder()
        .commonName("server name")
        .addSubjectAlternativeName("url-host.com")
        .build()
    val handshakeCertificates =
      HandshakeCertificates.Builder()
        .heldCertificate(heldCertificate)

          ),
      ),
    )
  }

  @Test
  fun `certificate attributes`() {
    val certificate =
      HeldCertificate.Builder()
        .certificateAuthority(3)
        .commonName("Jurassic Park")
        .organizationalUnit("Gene Research")
        .addSubjectAlternativeName("*.example.com")
        .addSubjectAlternativeName("www.example.org")
        .validityInterval(-1000L, 2000L)

    .certificateAuthority(0)
    .build();

// Create a server certificate and a server that uses it.
HeldCertificate serverCertificate = new HeldCertificate.Builder()
    .commonName("ingen")
    .addSubjectAlternativeName(server.getHostName())
    .signedBy(rootCertificate)
    .build();
HandshakeCertificates serverCertificates = new HandshakeCertificates.Builder()

  private val localhost: HandshakeCertificates by lazy {
    // Generate a self-signed cert for the server to serve and the client to trust.
    val heldCertificate =
      HeldCertificate.Builder()
        .commonName("localhost")
        .addSubjectAlternativeName("localhost")
        .addSubjectAlternativeName("localhost.localdomain")
        .build()
    return@lazy HandshakeCertificates.Builder()

    // Generate a self-signed cert for the server to serve and the client to trust.
    // can't use TlsUtil.localhost with a non OpenJSSE trust manager
    val heldCertificate =
      HeldCertificate.Builder()
        .commonName("localhost")
        .addSubjectAlternativeName("localhost")
        .build()
    val handshakeCertificates =
      HandshakeCertificates.Builder()
        .heldCertificate(heldCertificate)