@Test
public void testValueReplacementWithMissingConfigurations() throws Exception {

  makeUpgradeCluster();
  Cluster c = clusters.getCluster("c1");
  assertEquals(1, c.getConfigsByType("zoo.cfg").size());
  c.setDesiredStackVersion(HDP_220_STACK);
  Config config = cf.createNew(c, "zoo.cfg", "version2", new HashMap<String, String>() {
    {
      put("existing", "This exists!");
      put("missing", null);
    }
  }, 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");
  // Replacement task
  List<Replace> replacements = new ArrayList<>();
  Replace replace = new Replace();
  replace.key = "missing";
  replace.find = "foo";
  replace.replaceWith = "bar";
  replacements.add(replace);
  commandParams.put(ConfigureTask.PARAMETER_REPLACEMENTS, new Gson().toJson(replacements));
  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);
  assertEquals(3, c.getConfigsByType("zoo.cfg").size());
  config = c.getDesiredConfigByType("zoo.cfg");
  assertEquals(null, config.getProperties().get("missing"));
}