final ConfigGroup configGroup = configGroupFactory.createNew(cluster,
"cg1", "t1", "", new HashMap<String, Config>(), new HashMap<String, Host>());
configGroup.persist();
cluster.addConfigGroup(configGroup);
Map<String, Map<String,String>> actual =
new HashMap<String, Map<String, String>>() {{
put("global", new HashMap<String,String>() {{ put("tag", "version1"); }});
put("core-site", new HashMap<String,String>() {{ put("tag", "version1");