@Test
        void verifyInvalidEmail() throws Throwable {
            val requestContext = buildRequestContextFor(RegisteredServiceTestUtils.getPrincipal("casuser"));
            requestContext.setParameter("email", "$$$");
            val event = mfaSimpleMultifactorVerifyEmailAction.execute(requestContext);
            assertEquals(CasWebflowConstants.TRANSITION_ID_ERROR, event.getId());
        }
This is {@link CasSimpleMultifactorVerifyEmailActionTests}.

@author Misagh Moayyed
@since 7.2.0
support/cas-server-support-simple-mfa/src/test/java/org/apereo/cas/mfa/simple/web/flow/CasSimpleMultifactorVerifyEmailActionTests.java