@Test
    void verifyFinishRegistration() throws Throwable {
        val authn = RegisteredServiceTestUtils.getAuthentication();

        val server = mock(WebAuthnServer.class);
        val controller = new WebAuthnController(server);

        val registrationRequest = new RegistrationRequest("casuser", Optional.empty(),
            ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8)),
            new PublicKeyCredentialCreationOptions.PublicKeyCredentialCreationOptionsBuilder.MandatoryStages()
                .rp(new RelyingPartyIdentity.RelyingPartyIdentityBuilder.MandatoryStages()
                    .id(RandomUtils.randomAlphabetic(8)).name(RandomUtils.randomAlphabetic(8))
                    .build())
                .user(new UserIdentity.UserIdentityBuilder.MandatoryStages()
                    .name(RandomUtils.randomAlphabetic(8))
                    .displayName(RandomUtils.randomAlphabetic(8))
                    .id(ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8)))
                    .build())
                .challenge(ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8)))
                .pubKeyCredParams(List.of())
                .build(),
            Optional.of(ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8))));


        when(server.finishRegistration(anyString())).thenReturn(Either.left(List.of("Fails")));
        var result = controller.finishRegistration("registration-data");
        assertEquals(HttpStatus.BAD_REQUEST, result.getStatusCode());

        val exampleAttestation = ByteArray.fromHex(
            "a368617574684461746159012c49960de5880e8c687434170f6476605b8fe4aeb9a28632c7"
                + "995cf3ba831d976341000000000000000000000000000000000000000000a20008dce8bdc"
                + "3fc2c734a29a20ddb6509bceb721d7381859ab2548ae350fdb1962df68f1ebc08dbb5263c653b4"
                + "e855b45b7df85b4926ed4572f2af78da28028143d6a6de8c0afcc6c6fbb648ce0bac022ba0a2"
                + "303d2fced0d9772fcc0d32e281c8563082820e9bfd2e76241637ccbc36aebd85f398f6b6863d3d6755e3"
                + "98e05faf101e467c201219a83b2bf4269efc6e82f2c95dbfbc2a979ea2b78dea9b9fe467a2fa36361"
                + "6c6765455332353661785820c5df3292ce78ea68322b36073fd3b012a35cc9352cba7abd5ed2c287f6"
                + "112b5361795820a83b6a518319bee86dccd1c8d54b3acb4f590e2cf7d26616aad3e7aa49fc8b4c6366"
                + "6d74686669646f2d7532666761747453746d74a26378356381590136308201323081d9a0030201020"
                + "20500a5427a1d300a06082a8648ce3d0403023021311f301d0603550403131646697265666f782055"
                + "324620536f667420546f6b656e301e170d3137303833303134353130365a170d31373039303131343531"
                + "30365a3021311f301d0603550403131646697265666f782055324620536f667420546f6b656e30593013"
                + "06072a8648ce3d020106082a8648ce3d0301070342000409b9c8303e3a9f1cc0c4bb83c6d56a223699"
                + "137387ad27dd01ad9c8e0c80addce10e52e622197576f756e38d5965bf98d53ece5af4b0ec003ad08f932"
                + "bd84c1e300a06082a8648ce3d040302034800304502210083239a57e0fa99224b2c7989998cf833d5c1562"
                + "df38d285d46cab1d6cf46ae9e02204cfd5deb11de1fdafc4e899f8d03388164beaff2e4263a82210cc"
                + "c38906981236373696758463044022049c439848ec81672461cc0ea629f297cc7228450a6b0d0887"
                + "2ab969364ec6a6202200ea1acec627fd0e616d23da3e8bfa38a5527f2007cfe3fed63e5f3e2f7e25b11");

        val tokenBindingStatus = TokenBindingStatus.PRESENT;
        val tokenBindingId = ByteArray.fromBase64Url("IgqNmDkOp68Edjd8-uwxmh");
        val challenge = ByteArray.fromBase64Url("HfpNmDkOp66Edjd5-uvwlg");
        val clientJson = '{'
            + "\"authenticatorExtensions\":{\"boo\":\"far\"},"
            + "\"challenge\":\"" + challenge.getBase64Url() + "\","
            + "\"origin\":\"localhost\","
            + "\"tokenBinding\":{\"status\":\"" + tokenBindingStatus.getValue()
            + "\",\"id\":\"" + tokenBindingId.getBase64Url() + "\"},"
            + "\"type\":\"webauthn.get\""
            + '}';
        val response = AuthenticatorAttestationResponse.builder()
            .attestationObject(exampleAttestation)
            .clientDataJSON(new ByteArray(clientJson.getBytes(StandardCharsets.UTF_8)))
            .build();

        val publicKeyCredential = PublicKeyCredential.builder()
            .id(ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8)))
            .response(response)
            .clientExtensionResults(ClientRegistrationExtensionOutputs.builder().build())
            .build();
        val registrationResponse = new RegistrationResponse(
            ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8)),
            (PublicKeyCredential) publicKeyCredential,
            Optional.of(ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8))));

        when(server.finishRegistration(anyString())).thenReturn(
            Either.right(new WebAuthnServer.SuccessfulRegistrationResult(
                registrationRequest, registrationResponse,
                CredentialRegistration.builder()
                    .registrationTime(Instant.now(Clock.systemUTC()))
                    .credential(RegisteredCredential.builder()
                        .credentialId(ByteArray.fromBase64Url(authn.getPrincipal().getId()))
                        .userHandle(ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8)))
                        .publicKeyCose(ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8)))
                        .build())
                    .userIdentity(UserIdentity.builder()
                        .name("casuser")
                        .displayName("CAS")
                        .id(ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8)))
                        .build())
                    .build(), true,
                ByteArray.fromBase64Url(RandomUtils.randomAlphabetic(8)))));
        result = controller.finishRegistration("registration-data");
        assertEquals(HttpStatus.OK, result.getStatusCode());
    }
This is {@link WebAuthnControllerTests}.

@author Misagh Moayyed
@since 6.3.0
support/cas-server-support-webauthn-core/src/test/java/org/apereo/cas/webauthn/WebAuthnControllerTests.java