private static HpkeParameters getParameters(HpkeParameters.Variant variant)
      throws GeneralSecurityException {
    return HpkeParameters.builder()
        .setKemId(HpkeParameters.KemId.DHKEM_X25519_HKDF_SHA256)
        .setKdfId(HpkeParameters.KdfId.HKDF_SHA256)
        .setAeadId(HpkeParameters.AeadId.AES_128_GCM)
        .setVariant(variant)
        .build();
  }
This test attempts to test the case where a user registers their own key type with
Registry.registerKeyManager() and then uses it.
java_src/src/test/java/com/google/crypto/tink/hybrid/KeyManagerIntegrationTest.java