@Test
    public void services_is_allowed_root_element() throws Exception {
        String servicesXml = "<services>" + //
                "<container version=\"1.0\" />" + //
                "</services>";

        StandaloneContainer.withContainerModel(servicesXml, root -> null);
    }
@author Tony Vaagenes
@author gjoranv
@author ollivir
standalone-container/src/test/java/com/yahoo/container/standalone/StandaloneContainerTest.java