protected OAuth20AccessToken addAccessToken(final Principal principal,
                                                final OAuthRegisteredService registeredService) throws Throwable {
        val code = addCode(principal, registeredService);
        return addAccessToken(principal, registeredService, code.getId());
    }
This is {@link AbstractOAuth20Tests}.

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