private void assertZookeepersConfig(TestRoot root) {
        ZookeepersConfig.Builder builder = new ZookeepersConfig.Builder();
        root.getConfig(builder, "admin/standalone");
        ZookeepersConfig config = new ZookeepersConfig(builder);
        assertEquals(3, config.zookeeperserverlist().split(",").length);
    }
Test for creating cluster controllers under the admin tag.
config-model/src/test/java/com/yahoo/vespa/model/admin/ClusterControllerTestCase.java