@Test
    void testUnconfiguredNoContent() throws Exception {
        String xml = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" +
                "<services>\n" +
                "  <admin version=\"2.0\">\n" +
                "    <adminserver hostalias=\"configserver\" />\n" +
                "  </admin>\n" +
                "  <container version=\"1.0\">\n" +
                "    <nodes>" +
                "      <node hostalias=\"node1\"/>\n" +
                "    </nodes>\n" +
                "  </container>\n" +
                "</services>";

        VespaModel model = createVespaModel(xml);
        assertFalse(model.getService("admin/cluster-controllers/0").isPresent());

        assertFalse(existsHostsWithClusterControllerConfigId(model));
        assertNull(model.getAdmin().getClusterControllers());
    }
Test for creating cluster controllers under the admin tag.
config-model/src/test/java/com/yahoo/vespa/model/admin/ClusterControllerTestCase.java