private Authenticator getAuthenticator() {
        val client = (BaseClient) oidcJwtClientProvider.createClient();
        return client.getAuthenticator();
    }
This is {@link OidcJwtAuthenticatorRsaTests}.

@author Misagh Moayyed
@since 6.1.0
support/cas-server-support-oidc/src/test/java/org/apereo/cas/oidc/authn/OidcJwtAuthenticatorRsaTests.java