.isCloseTo(now.toDouble(), deltaMillis)
    assertThat(certificate.notAfter.time.toDouble())
      .isCloseTo(now.toDouble() + durationMillis, deltaMillis)
  }

  @Test
  fun customInterval() {
    // 5 seconds starting on 1970-01-01.
    val heldCertificate =
      HeldCertificate.Builder()
        .validityInterval(5000L, 10000L)
        .build()
    val certificate = heldCertificate.certificate