DynamicProperties systemProps = new DynamicProperties(file);

        // Get existing component and update it instead of registering new one
        DynamicProperties existingProps = SingletonLaContainerFactory.getContainer().getComponent("systemProperties");
        existingProps.setProperty("ldap.security.principal", "******@****.***");

        assertEquals("@fess.codelibs.local", fessConfig.getLdapSecurityPrincipal(null));