@Test
    void verifyLogoutUrlUnknownUrlProtocol() {
        val registeredService = getRegisteredService(".+");
        registeredService.setLogoutUrl(null);
        val builder = createDefaultSingleLogoutServiceLogoutUrlBuilder(false);
        val url = builder.determineLogoutUrl(registeredService, RegisteredServiceTestUtils.getService("imaps://etc.example.org"));
        assertTrue(url.isEmpty());
    }
This is {@link DefaultSingleLogoutServiceLogoutUrlBuilderTests}.

@author Misagh Moayyed
@since 5.1.0
core/cas-server-core-logout/src/test/java/org/apereo/cas/logout/DefaultSingleLogoutServiceLogoutUrlBuilderTests.java