protected OAuth20AccessToken getAccessToken(final Principal principal, final String clientId) throws Throwable {
        return getAccessToken(principal, StringUtils.EMPTY, clientId);
    }
This is {@link AbstractOidcTests}.

@author Misagh Moayyed
@since 5.3.0
support/cas-server-support-oidc/src/test/java/org/apereo/cas/oidc/AbstractOidcTests.java