* @param cp the Unicode code point to escape
   */
  public static void assertEscaping(UnicodeEscaper escaper, String expected, int cp) {

    String escaped = computeReplacement(escaper, cp);
    Assert.assertNotNull(escaped);
    Assert.assertEquals(expected, escaped);
  }

  /**
   * Asserts that an escaper does not escape the given character.
   *
   * @param escaper the non-null escaper to test

   * @param cp the Unicode code point to escape
   */
  public static void assertEscaping(UnicodeEscaper escaper, String expected, int cp) {

    String escaped = computeReplacement(escaper, cp);
    Assert.assertNotNull(escaped);
    Assert.assertEquals(expected, escaped);
  }

  /**
   * Asserts that an escaper does not escape the given character.
   *
   * @param escaper the non-null escaper to test

    // Test quotes are escaped.
    assertThat(xmlAttributeEscaper.escape("\"test\"")).isEqualTo(""test"");
    assertThat(xmlAttributeEscaper.escape("'test'")).isEqualTo("'test'");
    // Test all escapes
    assertThat(xmlAttributeEscaper.escape("a\"b<c>d&e\"f'"))
        .isEqualTo("a&quot;b&lt;c&gt;d&amp;e&quot;f&apos;");
    // Test '\t', '\n' and '\r' are escaped.

          destIndex += charsSkipped;
        }
        if (escaped.length > 0) {
          System.arraycopy(escaped, 0, dest, destIndex, escaped.length);
          destIndex += escaped.length;
        }
        // If we dealt with an escaped character, reset the unescaped range.
        unescapedChunkStart = nextIndex;
      }
      index = nextEscapeIndex(s, nextIndex, end);
    }

   * @return the escaped form of {@code string}
   * @throws NullPointerException if {@code string} is null
   * @throws IllegalArgumentException if {@code string} contains badly formed UTF-16 or cannot be
   *     escaped for any other reason
   */
  public abstract String escape(String string);

  private final Function<String, String> asFunction = this::escape;

public abstract class CharEscaper extends Escaper {
  /** Constructor for use by subclasses. */
  protected CharEscaper() {}

  /**
   * Returns the escaped form of a given literal string.
   *
   * @param string the literal string to be escaped
   * @return the escaped form of {@code string}
   * @throws NullPointerException if {@code string} is null
   */
  @Override
  public String escape(String string) {

        String[] result;

        // Escaped quotes within quoted value - DOES NOT get unquoted because pattern doesn't match
        value = "\"value with \"\"escaped\"\" quotes\"";
        result = KuromojiCSVUtil.parse(value);
        assertEquals(1, result.length);
        assertEquals("\"value with \"\"escaped\"\" quotes\"", result[0]);

    }

    @Test
    public void test_escapeLDAPSearchFilter_withNormalInput() {
        LdapManager ldapManager = new LdapManager();
        ldapManager.init();

        // Normal input should not be escaped
        assertEquals("normaluser", ldapManager.escapeLDAPSearchFilter("normaluser"));
        assertEquals("user123", ldapManager.escapeLDAPSearchFilter("user123"));

 *
 */
public class JsonUtil {

    /**
     * Defualt constructor.
     */
    protected JsonUtil() {
    }

    /**
     * Escapes a value as Json string.
     *
     * @param value input
     * @return escaped string.
     */
    public static String escape(final String value) {
        if (value == null) {
            return null;
        }

        char c;
        final int len = value.length();

            // Create proper escaped pattern
            String escapedPattern = mimeType.replace("+", "\\+");

            // Verify escaped pattern matches
            assertTrue("Escaped pattern should match: " + mimeType, Pattern.compile(escapedPattern).matcher(mimeType).matches());

            // Verify unescaped pattern does NOT match