assertThat(Adapters.NULL.fromDer(bytes)).isNull()
    assertThat(Adapters.NULL.toDer(null)).isEqualTo(bytes)
  }

  @Test fun `sequence algorithm`() {
    val bytes = "300d06092a864886f70d01010b0500".decodeHex()
    val algorithmIdentifier =
      AlgorithmIdentifier(
        algorithm = SHA256_WITH_RSA_ENCRYPTION,
        parameters = null,
      )
    assertThat(CertificateAdapters.algorithmIdentifier.fromDer(bytes))