@Test
  public void testCoerceValueOnCopy() throws Exception {
    Cluster c = clusters.getCluster("c1");
    assertEquals(1, c.getConfigsByType("zoo.cfg").size());

    Map<String, String> properties = new HashMap<String, String>() {
      {
        put("zoo.server.csv", "c6401,c6402,  c6403");
      }
    };

    Config config = createConfig(c, repoVersion2110, "zoo.cfg", "version2", properties);

    c.addDesiredConfig("user", Collections.singleton(config));
    assertEquals(2, c.getConfigsByType("zoo.cfg").size());

    createUpgrade(c, repoVersion2111);

    Map<String, String> commandParams = new HashMap<>();
    commandParams.put("clusterName", "c1");
    commandParams.put(ConfigureTask.PARAMETER_CONFIG_TYPE, "zoo.cfg");

    // copy with coerce
    List<Transfer> transfers = new ArrayList<>();
    Transfer transfer = new Transfer();
    transfer.operation = TransferOperation.COPY;
    transfer.coerceTo = TransferCoercionType.YAML_ARRAY;
    transfer.fromKey = "zoo.server.csv";
    transfer.toKey = "zoo.server.array";
    transfer.defaultValue = "['foo','bar']";
    transfers.add(transfer);

    commandParams.put(ConfigureTask.PARAMETER_TRANSFERS, new Gson().toJson(transfers));

    ExecutionCommand executionCommand = getExecutionCommand(commandParams);
    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");
    assertNotNull(config);
    assertFalse("version2".equals(config.getTag()));

    Map<String, String> map = config.getProperties();
    assertEquals("c6401,c6402,  c6403", map.get("zoo.server.csv"));
    assertEquals("['c6401','c6402','c6403']", map.get("zoo.server.array"));
  }
Tests that DELETE "*" with edit preserving works correctly.

@throws Exception
ambari-server/src/test/java/org/apache/ambari/server/serveraction/upgrades/ConfigureActionTest.java