protected OAuthRegisteredService addRegisteredService(final String redirectUri, final String clientSecret) {
        val registeredService = getRegisteredService(redirectUri, clientSecret, EnumSet.allOf(OAuth20GrantTypes.class));
        registeredService.setGenerateRefreshToken(true);
        servicesManager.save(registeredService);
        return registeredService;
    }
This is {@link AbstractOAuth20Tests}.

@author Misagh Moayyed
@since 5.0.0
support/cas-server-support-oauth/src/test/java/org/apereo/cas/AbstractOAuth20Tests.java