private OAuthRegisteredService getRegisteredServiceForJwtAccessTokenWithoutKeys(final OAuth20AccessToken accessToken) {
            val registeredService = getRegisteredService(accessToken.getService().getId(), "secret", new LinkedHashSet<>());
            registeredService.setJwtAccessToken(true);
            servicesManager.save(registeredService);
            return registeredService;
        }
This is {@link OAuth20JwtAccessTokenEncoderTests}.

@author Misagh Moayyed
@since 6.1.0
support/cas-server-support-oauth/src/test/java/org/apereo/cas/support/oauth/web/response/accesstoken/OAuth20JwtAccessTokenEncoderTests.java