public void testClear() {
   CharArraySet set = new CharArraySet(TEST_VERSION_CURRENT, 10, true);
   set.addAll(Arrays.asList(TEST_STOP_WORDS));
   assertEquals("Not all words added", TEST_STOP_WORDS.length, set.size());
   set.clear();
   assertEquals("not empty", 0, set.size());
   for (int i = 0; i < TEST_STOP_WORDS.length; i++) assertFalse(set.contains(TEST_STOP_WORDS[i]));
   set.addAll(Arrays.asList(TEST_STOP_WORDS));
   assertEquals("Not all words added", TEST_STOP_WORDS.length, set.size());
   for (int i = 0; i < TEST_STOP_WORDS.length; i++) assertTrue(set.contains(TEST_STOP_WORDS[i]));
 }
  /** Test the static #copy() function with a JDK {@link Set} as a source */
  public void testCopyJDKSet() {
    Set<String> set = new HashSet<>();

    List<String> stopwords = Arrays.asList(TEST_STOP_WORDS);
    List<String> stopwordsUpper = new ArrayList<>();
    for (String string : stopwords) {
      stopwordsUpper.add(string.toUpperCase(Locale.ROOT));
    }
    set.addAll(Arrays.asList(TEST_STOP_WORDS));

    CharArraySet copy = CharArraySet.copy(TEST_VERSION_CURRENT, set);

    assertEquals(set.size(), copy.size());
    assertEquals(set.size(), copy.size());

    assertTrue(copy.containsAll(stopwords));
    for (String string : stopwordsUpper) {
      assertFalse(copy.contains(string));
    }

    List<String> newWords = new ArrayList<>();
    for (String string : stopwords) {
      newWords.add(string + "_1");
    }
    copy.addAll(newWords);

    assertTrue(copy.containsAll(stopwords));
    assertTrue(copy.containsAll(newWords));
    // new added terms are not in the source set
    for (String string : newWords) {
      assertFalse(set.contains(string));
    }
  }
  @SuppressWarnings("deprecated")
  public void testCopyCharArraySetBWCompat() {
    CharArraySet setIngoreCase = new CharArraySet(TEST_VERSION_CURRENT, 10, true);
    CharArraySet setCaseSensitive = new CharArraySet(TEST_VERSION_CURRENT, 10, false);

    List<String> stopwords = Arrays.asList(TEST_STOP_WORDS);
    List<String> stopwordsUpper = new ArrayList<>();
    for (String string : stopwords) {
      stopwordsUpper.add(string.toUpperCase(Locale.ROOT));
    }
    setIngoreCase.addAll(Arrays.asList(TEST_STOP_WORDS));
    setIngoreCase.add(Integer.valueOf(1));
    setCaseSensitive.addAll(Arrays.asList(TEST_STOP_WORDS));
    setCaseSensitive.add(Integer.valueOf(1));

    CharArraySet copy = CharArraySet.copy(TEST_VERSION_CURRENT, setIngoreCase);
    CharArraySet copyCaseSens = CharArraySet.copy(TEST_VERSION_CURRENT, setCaseSensitive);

    assertEquals(setIngoreCase.size(), copy.size());
    assertEquals(setCaseSensitive.size(), copy.size());

    assertTrue(copy.containsAll(stopwords));
    assertTrue(copy.containsAll(stopwordsUpper));
    assertTrue(copyCaseSens.containsAll(stopwords));
    for (String string : stopwordsUpper) {
      assertFalse(copyCaseSens.contains(string));
    }
    // test adding terms to the copy
    List<String> newWords = new ArrayList<>();
    for (String string : stopwords) {
      newWords.add(string + "_1");
    }
    copy.addAll(newWords);

    assertTrue(copy.containsAll(stopwords));
    assertTrue(copy.containsAll(stopwordsUpper));
    assertTrue(copy.containsAll(newWords));
    // new added terms are not in the source set
    for (String string : newWords) {
      assertFalse(setIngoreCase.contains(string));
      assertFalse(setCaseSensitive.contains(string));
    }
  }
  public void testUnmodifiableSet() {
    CharArraySet set = new CharArraySet(TEST_VERSION_CURRENT, 10, true);
    set.addAll(Arrays.asList(TEST_STOP_WORDS));
    set.add(Integer.valueOf(1));
    final int size = set.size();
    set = CharArraySet.unmodifiableSet(set);
    assertEquals("Set size changed due to unmodifiableSet call", size, set.size());
    for (String stopword : TEST_STOP_WORDS) {
      assertTrue(set.contains(stopword));
    }
    assertTrue(set.contains(Integer.valueOf(1)));
    assertTrue(set.contains("1"));
    assertTrue(set.contains(new char[] {'1'}));

    try {
      CharArraySet.unmodifiableSet(null);
      fail("can not make null unmodifiable");
    } catch (NullPointerException e) {
      // expected
    }
  }
  public void testModifyOnUnmodifiable() {
    CharArraySet set = new CharArraySet(TEST_VERSION_CURRENT, 10, true);
    set.addAll(Arrays.asList(TEST_STOP_WORDS));
    final int size = set.size();
    set = CharArraySet.unmodifiableSet(set);
    assertEquals("Set size changed due to unmodifiableSet call", size, set.size());
    String NOT_IN_SET = "SirGallahad";
    assertFalse("Test String already exists in set", set.contains(NOT_IN_SET));

    try {
      set.add(NOT_IN_SET.toCharArray());
      fail("Modified unmodifiable set");
    } catch (UnsupportedOperationException e) {
      // expected
      assertFalse("Test String has been added to unmodifiable set", set.contains(NOT_IN_SET));
      assertEquals("Size of unmodifiable set has changed", size, set.size());
    }

    try {
      set.add(NOT_IN_SET);
      fail("Modified unmodifiable set");
    } catch (UnsupportedOperationException e) {
      // expected
      assertFalse("Test String has been added to unmodifiable set", set.contains(NOT_IN_SET));
      assertEquals("Size of unmodifiable set has changed", size, set.size());
    }

    try {
      set.add(new StringBuilder(NOT_IN_SET));
      fail("Modified unmodifiable set");
    } catch (UnsupportedOperationException e) {
      // expected
      assertFalse("Test String has been added to unmodifiable set", set.contains(NOT_IN_SET));
      assertEquals("Size of unmodifiable set has changed", size, set.size());
    }

    try {
      set.clear();
      fail("Modified unmodifiable set");
    } catch (UnsupportedOperationException e) {
      // expected
      assertFalse("Changed unmodifiable set", set.contains(NOT_IN_SET));
      assertEquals("Size of unmodifiable set has changed", size, set.size());
    }
    try {
      set.add((Object) NOT_IN_SET);
      fail("Modified unmodifiable set");
    } catch (UnsupportedOperationException e) {
      // expected
      assertFalse("Test String has been added to unmodifiable set", set.contains(NOT_IN_SET));
      assertEquals("Size of unmodifiable set has changed", size, set.size());
    }

    // This test was changed in 3.1, as a contains() call on the given Collection using the
    // "correct" iterator's
    // current key (now a char[]) on a Set<String> would not hit any element of the CAS and therefor
    // never call
    // remove() on the iterator
    try {
      set.removeAll(new CharArraySet(TEST_VERSION_CURRENT, Arrays.asList(TEST_STOP_WORDS), true));
      fail("Modified unmodifiable set");
    } catch (UnsupportedOperationException e) {
      // expected
      assertEquals("Size of unmodifiable set has changed", size, set.size());
    }

    try {
      set.retainAll(new CharArraySet(TEST_VERSION_CURRENT, Arrays.asList(NOT_IN_SET), true));
      fail("Modified unmodifiable set");
    } catch (UnsupportedOperationException e) {
      // expected
      assertEquals("Size of unmodifiable set has changed", size, set.size());
    }

    try {
      set.addAll(Arrays.asList(NOT_IN_SET));
      fail("Modified unmodifiable set");
    } catch (UnsupportedOperationException e) {
      // expected
      assertFalse("Test String has been added to unmodifiable set", set.contains(NOT_IN_SET));
    }

    for (int i = 0; i < TEST_STOP_WORDS.length; i++) {
      assertTrue(set.contains(TEST_STOP_WORDS[i]));
    }
  }
 public void testRehash() throws Exception {
   CharArraySet cas = new CharArraySet(TEST_VERSION_CURRENT, 0, true);
   for (int i = 0; i < TEST_STOP_WORDS.length; i++) cas.add(TEST_STOP_WORDS[i]);
   assertEquals(TEST_STOP_WORDS.length, cas.size());
   for (int i = 0; i < TEST_STOP_WORDS.length; i++) assertTrue(cas.contains(TEST_STOP_WORDS[i]));
 }