assertEquals(original, copy);
    assertThat(copy).isNotSameInstanceAs(original);
  }

  public void testEnumMapWithInitialMap() {
    HashMap<SomeEnum, Integer> original = new HashMap<>();
    original.put(SomeEnum.SOME_INSTANCE, 0);
    EnumMap<SomeEnum, Integer> copy = Maps.newEnumMap(original);
    assertEquals(original, copy);
  }

  public void testEnumMapWithInitialEmptyMap() {

    final CharMatcher original;

    Negated(CharMatcher original) {
      this.original = checkNotNull(original);
    }

    @Override
    public boolean matches(char c) {
      return !original.matches(c);
    }

    @Override
    public boolean matchesAllOf(CharSequence sequence) {
      return original.matchesNoneOf(sequence);
    }

    @Override

    final CharMatcher original;

    Negated(CharMatcher original) {
      this.original = checkNotNull(original);
    }

    @Override
    public boolean matches(char c) {
      return !original.matches(c);
    }

    @Override
    public boolean matchesAllOf(CharSequence sequence) {
      return original.matchesNoneOf(sequence);
    }

    @Override

        assertEquals("original query", result);
    }

    @Test
    public void test_regenerateQuery_exception_returnsFailedQuery() {
        client.setChatResponse(null); // causes LlmException

        final String result = client.regenerateQuery("test question", "original query", "no_results", Collections.emptyList());

        assertEquals("original query", result);

    public void test_toJson_and_parseJson_roundtrip() {
        final Map<String, Object> original = new LinkedHashMap<>();
        original.put("type", "operation");
        original.put("name", "reindex");
        original.put("status", "running");
        original.put("createdTime", 1234567890L);

        final String json = coordinatorHelper.toJson(original);
        final Map<String, Object> parsed = coordinatorHelper.parseJson(json);

   * IllegalArgumentException} if passed a {@code fromKey} less than an earlier {@code fromKey}.
   * However, this method doesn't throw an exception in that situation, but instead keeps the
   * original {@code fromKey}. Similarly, this method keeps the original {@code toKey}, instead of
   * throwing an exception, if passed a {@code toKey} greater than an earlier {@code toKey}.
   */
  @Override

   * IllegalArgumentException} if passed a {@code fromKey} less than an earlier {@code fromKey}.
   * However, this method doesn't throw an exception in that situation, but instead keeps the
   * original {@code fromKey}. Similarly, this method keeps the original {@code toKey}, instead of
   * throwing an exception, if passed a {@code toKey} greater than an earlier {@code toKey}.
   */
  @Override

    /** Fields that should be highlighted in search results */
    protected String[] highlightedFields;

    /** Original highlight tag prefix */
    protected String originalHighlightTagPre = "";

    /** Original highlight tag suffix */
    protected String originalHighlightTagPost = "";

    /** Configured highlight tag prefix */
    protected String highlightTagPre;

   */
  // Guarded By Segment.this
  @VisibleForTesting
  E copyEntry(E original, E newNext) {
    int hash = original.getHash();
    return segmentFor(hash).copyEntry(original, newNext);
  }

  int hash(Object key) {
    int h = keyEquivalence.hash(key);
    return rehash(h);
  }

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