@Test
        void verifyAcrMissingMfa() {
            val service = RegisteredServiceTestUtils.getService();
            val request = new MockHttpServletRequest();
            request.addParameter(OAuth20Constants.ACR_VALUES, "unknown");
            val authn = RegisteredServiceTestUtils.getAuthentication();
            val registeredService = RegisteredServiceTestUtils.getRegisteredService();
            assertThrows(AuthenticationException.class,
                () -> oidcMultifactorAuthenticationTrigger.isActivated(authn, registeredService, request,
                    new MockHttpServletResponse(), service));
        }
This is {@link OidcMultifactorAuthenticationTriggerTests}.

@author Misagh Moayyed
@since 6.3.0
support/cas-server-support-oidc/src/test/java/org/apereo/cas/oidc/web/flow/OidcMultifactorAuthenticationTriggerTests.java