public static TestUnavailableMultifactorAuthenticationProvider registerProviderIntoApplicationContext(
        final ConfigurableApplicationContext applicationContext) {
        return ApplicationContextProvider.registerBeanIntoApplicationContext(applicationContext,
            TestUnavailableMultifactorAuthenticationProvider.class, "unavailable-provider%d".formatted(System.currentTimeMillis()));
    }
Register provider into application context.

@param applicationContext the application context
@return the multifactor authentication provider
core/cas-server-core-authentication-mfa-api/src/test/java/org/apereo/cas/authentication/mfa/TestUnavailableMultifactorAuthenticationProvider.java