@Test
        void verifyOperation() {
            assertNotNull(oidcIssuerService.determineIssuer(Optional.empty()));
        }
This is {@link OidcDefaultIssuerServiceTests}.

@author Misagh Moayyed
@since 6.4.0
support/cas-server-support-oidc/src/test/java/org/apereo/cas/oidc/issuer/OidcDefaultIssuerServiceTests.java