assertEqualCharNodes(traverser.depthFirstPreOrder(charactersOf("")), "");
    assertEqualCharNodes(traverser.depthFirstPreOrder(charactersOf("bc")), "bdc");
    assertEqualCharNodes(traverser.depthFirstPreOrder(charactersOf("a")), "abdc");
    assertEqualCharNodes(traverser.depthFirstPreOrder(charactersOf("acdb")), "abdc");
    assertEqualCharNodes(traverser.depthFirstPreOrder(charactersOf("db")), "db");
  }

  @Test

/**
 * The BadWordSettings class manages the settings related to bad words.
 * It allows adding, deleting, and retrieving bad words from the settings.
 * It also supports loading default bad words from a file.
 */
public class BadWordSettings {
    private static final Logger logger = LogManager.getLogger(BadWordSettings.class);

    /** Key for bad word settings. */
    public static final String BAD_WORD_SETTINGS_KEY = "badword";

    }

    /**
     * Gets a bad word by its ID.
     * @param id The bad word ID.
     * @return Optional entity containing the bad word if found.
     */
    public OptionalEntity<BadWord> getBadWord(final String id) {
        return badWordBhv.selectByPK(id);
    }

    /**
     * Stores (inserts or updates) a bad word.
     * @param badWord The bad word to store.
     */

    }

    /**
     * Adds a bad word to the suggest index.
     *
     * @param badWord The bad word to add.
     * @param apply   true to apply the changes immediately.
     */
    public void addBadWord(final String badWord, final boolean apply) {
        suggester.indexer().addBadWord(badWord, apply);
        refresh();
    }

    /**
     * Deletes a bad word from the suggest index.
     *

 * <li>{@link #indexFromSearchWord(String, String[], String[], String[], int, String[])} - Index from search word.
 * <li>{@link #addBadWord(String, boolean)} - Add a bad word and optionally apply it.
 * <li>{@link #deleteBadWord(String)} - Delete a bad word.
 * <li>{@link #addElevateWord(ElevateWord, boolean)} - Add an elevate word and optionally apply it.

  public void testFromStringBadDefaultPort() {
    // Well-formed strings with bad default ports.
    checkFromStringCase("gmail.com:81", -1, "gmail.com", 81, true);
    checkFromStringCase("192.0.2.2:83", -1, "192.0.2.2", 83, true);
    checkFromStringCase("[2001::2]:85", -1, "2001::2", 85, true);
    checkFromStringCase("goo.gl:65535", 65536, "goo.gl", 65535, true);
    // No port, bad default.
    checkFromStringCase("google.com", -1, "google.com", -1, false);

  public void testFromStringBadDefaultPort() {
    // Well-formed strings with bad default ports.
    checkFromStringCase("gmail.com:81", -1, "gmail.com", 81, true);
    checkFromStringCase("192.0.2.2:83", -1, "192.0.2.2", 83, true);
    checkFromStringCase("[2001::2]:85", -1, "2001::2", 85, true);
    checkFromStringCase("goo.gl:65535", 65536, "goo.gl", 65535, true);
    // No port, bad default.
    checkFromStringCase("google.com", -1, "google.com", -1, false);

labels.bad_word_link_upload=Upload
labels.bad_word_button_download=Download
labels.bad_word_button_upload=Upload
labels.bad_word_list_suggest_word=Bad Word
labels.bad_word_suggest_word=Bad Word
labels.bad_word_file=Bad Word File
labels.user_configuration=User
labels.user_list_name=Name
labels.user_password=Password
labels.user_confirm_password=Password (Confirm)
labels.user_title_details=User

            }
            break;
        default:
            break;
        }
        return OptionalEntity.empty();
    }

    /**
     * Get the bad word.
     * @param form The create form.
     * @return The bad word.
     */
    public static OptionalEntity<BadWord> getBadWord(final CreateForm form) {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();

          @Override
          public boolean isCancelled() {
            return true; // BAD!!
          }

          @Override
          public String get() {
            return "foo"; // BAD!!
          }

          @Override
          public String get(long time, TimeUnit unit) {
            return "foo"; // BAD!!
          }

          @Override