companion object {
    /**
     * A DNS that uses [InetAddress.getAllByName] to ask the underlying operating system to
     * lookup IP addresses. Most custom [Dns] implementations should delegate to this instance.
     */
    @JvmField
    val SYSTEM: Dns = DnsSystem()

    private class DnsSystem : Dns {
      override fun lookup(hostname: String): List<InetAddress> {
        try {

        .maxAge(2, TimeUnit.DAYS)
        .build()
    assertThat(cacheControl.toString()).isEqualTo("max-age=172800")
    assertThat(cacheControl.toString()).isSameAs(cacheControl.toString())
  }

  @Test
  @Throws(Exception::class)
  fun timeDurationTruncatedToMaxValue() {
    val cacheControl =
      CacheControl.Builder()
        .maxAge(365 * 100, TimeUnit.DAYS) // Longer than Integer.MAX_VALUE seconds.