.serialNumber(1L)
        .certificateAuthority(2)
        .build()
    val certA =
      HeldCertificate
        .Builder()
        .serialNumber(2L)
        .certificateAuthority(1)
        .signedBy(root)
        .build()
    val certB =
      HeldCertificate
        .Builder()
        .serialNumber(3L)
        .certificateAuthority(0)
        .signedBy(certA)
        .build()

    platform.assumeNotConscrypt()
    platform.assumeNotBouncyCastle()

    val clientRoot =
      HeldCertificate
        .Builder()
        .certificateAuthority(1)
        .build()
    val clientIntermediate =
      HeldCertificate
        .Builder()
        .certificateAuthority(0)
        .signedBy(clientRoot)
        .build()
    val clientCertificate =
      HeldCertificate
        .Builder()

We use `certificateAuthority(int)` to create certificates that can sign other certificates. The
int specifies how many intermediate certificates are allowed beneath it in the chain.

```java
HeldCertificate rootCertificate = new HeldCertificate.Builder()
    .certificateAuthority(1)
    .build();

HeldCertificate intermediateCertificate = new HeldCertificate.Builder()

import org.junit.jupiter.api.Test

class HandshakeTest {
  val serverRoot =
    HeldCertificate
      .Builder()
      .certificateAuthority(1)
      .build()
  val serverIntermediate =
    HeldCertificate
      .Builder()
      .certificateAuthority(0)
      .signedBy(serverRoot)
      .build()
  val serverCertificate =
    HeldCertificate
      .Builder()
      .signedBy(serverIntermediate)

	public fun <init> ()V
	public final fun addSubjectAlternativeName (Ljava/lang/String;)Lokhttp3/tls/HeldCertificate$Builder;
	public final fun build ()Lokhttp3/tls/HeldCertificate;
	public final fun certificateAuthority (I)Lokhttp3/tls/HeldCertificate$Builder;
	public final fun commonName (Ljava/lang/String;)Lokhttp3/tls/HeldCertificate$Builder;
	public final fun duration (JLjava/util/concurrent/TimeUnit;)Lokhttp3/tls/HeldCertificate$Builder;