@Test
public void testDeletePreserveChanges() throws Exception {

  makeUpgradeCluster();
  Cluster c = clusters.getCluster("c1");
  assertEquals(1, c.getConfigsByType("zoo.cfg").size());
  c.setDesiredStackVersion(HDP_220_STACK);
  // create a config for zoo.cfg with two values; one is a stack value and the
  // other is custom
  Config config = cf.createNew(c, "zoo.cfg", "version2", new HashMap<String, String>() {
    {
      put("tickTime", "2000");
      put("foo", "bar");
    }
  }, new HashMap<String, Map<String, String>>());
  c.addDesiredConfig("user", Collections.singleton(config));
  assertEquals(2, c.getConfigsByType("zoo.cfg").size());
  Map<String, String> commandParams = new HashMap<>();
  commandParams.put("upgrade_direction", "upgrade");
  commandParams.put("version", HDP_2_2_0_1);
  commandParams.put("clusterName", "c1");
  commandParams.put(ConfigureTask.PARAMETER_CONFIG_TYPE, "zoo.cfg");
  // delete all keys, preserving edits or additions
  List<Transfer> transfers = new ArrayList<>();
  Transfer transfer = new Transfer();
  transfer.operation = TransferOperation.DELETE;
  transfer.deleteKey = "*";
  transfer.preserveEdits = true;
  transfers.add(transfer);
  commandParams.put(ConfigureTask.PARAMETER_TRANSFERS, new Gson().toJson(transfers));
  ExecutionCommand executionCommand = new ExecutionCommand();
  executionCommand.setCommandParams(commandParams);
  executionCommand.setClusterName("c1");
  executionCommand.setRoleParams(new HashMap<String, String>());
  executionCommand.getRoleParams().put(ServerAction.ACTION_USER_NAME, "username");
  HostRoleCommand hostRoleCommand = hostRoleCommandFactory.create(null, null, null, null);
  hostRoleCommand.setExecutionCommandWrapper(new ExecutionCommandWrapper(executionCommand));
  action.setExecutionCommand(executionCommand);
  action.setHostRoleCommand(hostRoleCommand);
  CommandReport report = action.execute(null);
  assertNotNull(report);
  // make sure there are now 3 versions after the merge
  assertEquals(3, c.getConfigsByType("zoo.cfg").size());
  config = c.getDesiredConfigByType("zoo.cfg");
  assertNotNull(config);
  assertFalse("version2".equals(config.getTag()));
  // time to check our values; there should only be 1 left since tickTime was
  // removed
  Map<String, String> map = config.getProperties();
  assertEquals("bar", map.get("foo"));
  assertFalse(map.containsKey("tickTime"));
}