@Override
                public Optional<Credentials> getCredentials(final CallContext callContext) {
                    return Optional.of(fakeCredentials);
                }
This is {@link DelegatedAuthenticationClientsTestConfiguration}.

@author Misagh Moayyed
@since 6.6.0
support/cas-server-support-pac4j-core-clients/src/test/java/org/apereo/cas/support/pac4j/authentication/clients/DelegatedAuthenticationClientsTestConfiguration.java