lucene/core/src/test/org/apache/lucene/analysis/TestCharArraySet.java - lucene-solr - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You under the Apache License, Version 2.0
  * (the "License"); you may not use this file except in compliance with
  * the License.  You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package org.apache.lucene.analysis;


 import java.util.*;

 import org.apache.lucene.util.LuceneTestCase;
 import org.apache.lucene.util.SuppressForbidden;


 public class TestCharArraySet extends LuceneTestCase {

   static final String[] TEST_STOP_WORDS = {
     "a", "an", "and", "are", "as", "at", "be", "but", "by",
     "for", "if", "in", "into", "is", "it",
     "no", "not", "of", "on", "or", "such",
     "that", "the", "their", "then", "there", "these",
     "they", "this", "to", "was", "will", "with"
   };


   public void testRehash() throws Exception {
     CharArraySet cas = new CharArraySet(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]));
   }

   public void testNonZeroOffset() {
     String[] words={"Hello","World","this","is","a","test"};
     char[] findme="xthisy".toCharArray();
     CharArraySet set= new CharArraySet(10, true);
     set.addAll(Arrays.asList(words));
     assertTrue(set.contains(findme, 1, 4));
     assertTrue(set.contains(new String(findme,1,4)));

     // test unmodifiable
     set = CharArraySet.unmodifiableSet(set);
     assertTrue(set.contains(findme, 1, 4));
     assertTrue(set.contains(new String(findme,1,4)));
   }

   @SuppressForbidden(reason = "Explicitly checking new Integers")
   public void testObjectContains() {
     CharArraySet set = new CharArraySet(10, true);
     Integer val = Integer.valueOf(1);
     set.add(val);
     assertTrue(set.contains(val));
     assertTrue(set.contains(new Integer(1))); // another integer
     assertTrue(set.contains("1"));
     assertTrue(set.contains(new char[]{'1'}));
     // test unmodifiable
     set = CharArraySet.unmodifiableSet(set);
     assertTrue(set.contains(val));
     assertTrue(set.contains(new Integer(1))); // another integer
     assertTrue(set.contains("1"));
     assertTrue(set.contains(new char[]{'1'}));
   }

   public void testClear(){
     CharArraySet set=new CharArraySet(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]));
   }

   // TODO: break this up into simpler test methods, vs "telling a story"
   public void testModifyOnUnmodifiable(){
     CharArraySet set = new CharArraySet(10, true);
     set.addAll(Arrays.asList(TEST_STOP_WORDS));
     final int size = set.size();
     CharArraySet unmodifiableSet = CharArraySet.unmodifiableSet(set);
     assertEquals("Set size changed due to unmodifiableSet call" , size, unmodifiableSet.size());
     String NOT_IN_SET = "SirGallahad";
     assertFalse("Test String already exists in set", unmodifiableSet.contains(NOT_IN_SET));

     expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.add(NOT_IN_SET.toCharArray()));
     assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
     assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

     expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.add(NOT_IN_SET));
     assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
     assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

     expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.add(new StringBuilder(NOT_IN_SET)));
     assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
     assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

     expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.clear());
     assertFalse("Changed unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
     assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

     expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.add((Object) NOT_IN_SET));
     assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
     assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.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
     expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.removeAll(new CharArraySet(Arrays.asList(TEST_STOP_WORDS), true)));
     assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

     expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.retainAll(new CharArraySet(Arrays.asList(NOT_IN_SET), true)));
     assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

     expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.addAll(Arrays.asList(NOT_IN_SET)));
     assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));

     for (int i = 0; i < TEST_STOP_WORDS.length; i++) {
       assertTrue(set.contains(TEST_STOP_WORDS[i]));
       assertTrue(unmodifiableSet.contains(TEST_STOP_WORDS[i]));
     }
   }

   public void testUnmodifiableSet(){
     CharArraySet set = new CharArraySet(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'}));

     expectThrows(NullPointerException.class, () -> {
       CharArraySet.unmodifiableSet(null);
     });
   }

   public void testSupplementaryChars() {
     String missing = "Term %s is missing in the set";
     String falsePos = "Term %s is in the set but shouldn't";
     // for reference see
     // http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[[%3ACase_Sensitive%3DTrue%3A]%26[^[\u0000-\uFFFF]]]&esc=on
     String[] upperArr = new String[] {"Abc\ud801\udc1c",
         "\ud801\udc1c\ud801\udc1cCDE", "A\ud801\udc1cB"};
     String[] lowerArr = new String[] {"abc\ud801\udc44",
         "\ud801\udc44\ud801\udc44cde", "a\ud801\udc44b"};
     CharArraySet set = new CharArraySet(Arrays.asList(TEST_STOP_WORDS), true);
     for (String upper : upperArr) {
       set.add(upper);
     }
     for (int i = 0; i < upperArr.length; i++) {
       assertTrue(String.format(Locale.ROOT, missing, upperArr[i]), set.contains(upperArr[i]));
       assertTrue(String.format(Locale.ROOT, missing, lowerArr[i]), set.contains(lowerArr[i]));
     }
     set = new CharArraySet(Arrays.asList(TEST_STOP_WORDS), false);
     for (String upper : upperArr) {
       set.add(upper);
     }
     for (int i = 0; i < upperArr.length; i++) {
       assertTrue(String.format(Locale.ROOT, missing, upperArr[i]), set.contains(upperArr[i]));
       assertFalse(String.format(Locale.ROOT, falsePos, lowerArr[i]), set.contains(lowerArr[i]));
     }
   }

   public void testSingleHighSurrogate() {
     String missing = "Term %s is missing in the set";
     String falsePos = "Term %s is in the set but shouldn't";
     String[] upperArr = new String[] { "ABC\uD800", "ABC\uD800EfG",
         "\uD800EfG", "\uD800\ud801\udc1cB" };

     String[] lowerArr = new String[] { "abc\uD800", "abc\uD800efg",
         "\uD800efg", "\uD800\ud801\udc44b" };
     CharArraySet set = new CharArraySet(Arrays
         .asList(TEST_STOP_WORDS), true);
     for (String upper : upperArr) {
       set.add(upper);
     }
     for (int i = 0; i < upperArr.length; i++) {
       assertTrue(String.format(Locale.ROOT, missing, upperArr[i]), set.contains(upperArr[i]));
       assertTrue(String.format(Locale.ROOT, missing, lowerArr[i]), set.contains(lowerArr[i]));
     }
     set = new CharArraySet(Arrays.asList(TEST_STOP_WORDS),
         false);
     for (String upper : upperArr) {
       set.add(upper);
     }
     for (int i = 0; i < upperArr.length; i++) {
       assertTrue(String.format(Locale.ROOT, missing, upperArr[i]), set.contains(upperArr[i]));
       assertFalse(String.format(Locale.ROOT, falsePos, upperArr[i]), set
           .contains(lowerArr[i]));
     }
   }

   @SuppressWarnings("deprecated")
   public void testCopyCharArraySetBWCompat() {
     CharArraySet setIngoreCase = new CharArraySet(10, true);
     CharArraySet setCaseSensitive = new CharArraySet(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(setIngoreCase);
     CharArraySet copyCaseSens = CharArraySet.copy(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));

     }
   }

   /**
    * Test the static #copy() function with a CharArraySet as a source
    */
   public void testCopyCharArraySet() {
     CharArraySet setIngoreCase = new CharArraySet(10, true);
     CharArraySet setCaseSensitive = new CharArraySet(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(setIngoreCase);
     CharArraySet copyCaseSens = CharArraySet.copy(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));

     }
   }

   /**
    * 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(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));
     }
   }

   /**
    * Tests a special case of {@link CharArraySet#copy(Set)} where the
    * set to copy is the {@link CharArraySet#EMPTY_SET}
    */
   public void testCopyEmptySet() {
     assertSame(CharArraySet.EMPTY_SET,
         CharArraySet.copy(CharArraySet.EMPTY_SET));
   }

   /**
    * Smoketests the static empty set
    */
   public void testEmptySet() {
     assertEquals(0, CharArraySet.EMPTY_SET.size());

     assertTrue(CharArraySet.EMPTY_SET.isEmpty());
     for (String stopword : TEST_STOP_WORDS) {
       assertFalse(CharArraySet.EMPTY_SET.contains(stopword));
     }
     assertFalse(CharArraySet.EMPTY_SET.contains("foo"));
     assertFalse(CharArraySet.EMPTY_SET.contains((Object) "foo"));
     assertFalse(CharArraySet.EMPTY_SET.contains("foo".toCharArray()));
     assertFalse(CharArraySet.EMPTY_SET.contains("foo".toCharArray(),0,3));
   }

   /**
    * Test for NPE
    */
   public void testContainsWithNull() {
     CharArraySet set = new CharArraySet(1, true);

     expectThrows(NullPointerException.class, () -> {
       set.contains((char[]) null, 0, 10);
     });

     expectThrows(NullPointerException.class, () -> {
       set.contains((CharSequence) null);
     });

     expectThrows(NullPointerException.class, () -> {
       set.contains((Object) null);
     });
   }

   public void testToString() {
     CharArraySet set = CharArraySet.copy(Collections.singleton("test"));
     assertEquals("[test]", set.toString());
     set.add("test2");
     assertTrue(set.toString().contains(", "));
   }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package org.apache.lucene.analysis;


	import java.util.*;

	import org.apache.lucene.util.LuceneTestCase;
	import org.apache.lucene.util.SuppressForbidden;


	public class TestCharArraySet extends LuceneTestCase {

	static final String[] TEST_STOP_WORDS = {
	"a", "an", "and", "are", "as", "at", "be", "but", "by",
	"for", "if", "in", "into", "is", "it",
	"no", "not", "of", "on", "or", "such",
	"that", "the", "their", "then", "there", "these",
	"they", "this", "to", "was", "will", "with"
	};


	public void testRehash() throws Exception {
	CharArraySet cas = new CharArraySet(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]));
	}

	public void testNonZeroOffset() {
	String[] words={"Hello","World","this","is","a","test"};
	char[] findme="xthisy".toCharArray();
	CharArraySet set= new CharArraySet(10, true);
	set.addAll(Arrays.asList(words));
	assertTrue(set.contains(findme, 1, 4));
	assertTrue(set.contains(new String(findme,1,4)));

	// test unmodifiable
	set = CharArraySet.unmodifiableSet(set);
	assertTrue(set.contains(findme, 1, 4));
	assertTrue(set.contains(new String(findme,1,4)));
	}

	@SuppressForbidden(reason = "Explicitly checking new Integers")
	public void testObjectContains() {
	CharArraySet set = new CharArraySet(10, true);
	Integer val = Integer.valueOf(1);
	set.add(val);
	assertTrue(set.contains(val));
	assertTrue(set.contains(new Integer(1))); // another integer
	assertTrue(set.contains("1"));
	assertTrue(set.contains(new char[]{'1'}));
	// test unmodifiable
	set = CharArraySet.unmodifiableSet(set);
	assertTrue(set.contains(val));
	assertTrue(set.contains(new Integer(1))); // another integer
	assertTrue(set.contains("1"));
	assertTrue(set.contains(new char[]{'1'}));
	}

	public void testClear(){
	CharArraySet set=new CharArraySet(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]));
	}

	// TODO: break this up into simpler test methods, vs "telling a story"
	public void testModifyOnUnmodifiable(){
	CharArraySet set = new CharArraySet(10, true);
	set.addAll(Arrays.asList(TEST_STOP_WORDS));
	final int size = set.size();
	CharArraySet unmodifiableSet = CharArraySet.unmodifiableSet(set);
	assertEquals("Set size changed due to unmodifiableSet call" , size, unmodifiableSet.size());
	String NOT_IN_SET = "SirGallahad";
	assertFalse("Test String already exists in set", unmodifiableSet.contains(NOT_IN_SET));

	expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.add(NOT_IN_SET.toCharArray()));
	assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
	assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

	expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.add(NOT_IN_SET));
	assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
	assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

	expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.add(new StringBuilder(NOT_IN_SET)));
	assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
	assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

	expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.clear());
	assertFalse("Changed unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
	assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

	expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.add((Object) NOT_IN_SET));
	assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));
	assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.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
	expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.removeAll(new CharArraySet(Arrays.asList(TEST_STOP_WORDS), true)));
	assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

	expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.retainAll(new CharArraySet(Arrays.asList(NOT_IN_SET), true)));
	assertEquals("Size of unmodifiable set has changed", size, unmodifiableSet.size());

	expectThrows(UnsupportedOperationException.class, () -> unmodifiableSet.addAll(Arrays.asList(NOT_IN_SET)));
	assertFalse("Test String has been added to unmodifiable set", unmodifiableSet.contains(NOT_IN_SET));

	for (int i = 0; i < TEST_STOP_WORDS.length; i++) {
	assertTrue(set.contains(TEST_STOP_WORDS[i]));
	assertTrue(unmodifiableSet.contains(TEST_STOP_WORDS[i]));
	}
	}

	public void testUnmodifiableSet(){
	CharArraySet set = new CharArraySet(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'}));

	expectThrows(NullPointerException.class, () -> {
	CharArraySet.unmodifiableSet(null);
	});
	}

	public void testSupplementaryChars() {
	String missing = "Term %s is missing in the set";
	String falsePos = "Term %s is in the set but shouldn't";
	// for reference see
	// http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[[%3ACase_Sensitive%3DTrue%3A]%26[^[\u0000-\uFFFF]]]&esc=on
	String[] upperArr = new String[] {"Abc\ud801\udc1c",
	"\ud801\udc1c\ud801\udc1cCDE", "A\ud801\udc1cB"};
	String[] lowerArr = new String[] {"abc\ud801\udc44",
	"\ud801\udc44\ud801\udc44cde", "a\ud801\udc44b"};
	CharArraySet set = new CharArraySet(Arrays.asList(TEST_STOP_WORDS), true);
	for (String upper : upperArr) {
	set.add(upper);
	}
	for (int i = 0; i < upperArr.length; i++) {
	assertTrue(String.format(Locale.ROOT, missing, upperArr[i]), set.contains(upperArr[i]));
	assertTrue(String.format(Locale.ROOT, missing, lowerArr[i]), set.contains(lowerArr[i]));
	}
	set = new CharArraySet(Arrays.asList(TEST_STOP_WORDS), false);
	for (String upper : upperArr) {
	set.add(upper);
	}
	for (int i = 0; i < upperArr.length; i++) {
	assertTrue(String.format(Locale.ROOT, missing, upperArr[i]), set.contains(upperArr[i]));
	assertFalse(String.format(Locale.ROOT, falsePos, lowerArr[i]), set.contains(lowerArr[i]));
	}
	}

	public void testSingleHighSurrogate() {
	String missing = "Term %s is missing in the set";
	String falsePos = "Term %s is in the set but shouldn't";
	String[] upperArr = new String[] { "ABC\uD800", "ABC\uD800EfG",
	"\uD800EfG", "\uD800\ud801\udc1cB" };

	String[] lowerArr = new String[] { "abc\uD800", "abc\uD800efg",
	"\uD800efg", "\uD800\ud801\udc44b" };
	CharArraySet set = new CharArraySet(Arrays
	.asList(TEST_STOP_WORDS), true);
	for (String upper : upperArr) {
	set.add(upper);
	}
	for (int i = 0; i < upperArr.length; i++) {
	assertTrue(String.format(Locale.ROOT, missing, upperArr[i]), set.contains(upperArr[i]));
	assertTrue(String.format(Locale.ROOT, missing, lowerArr[i]), set.contains(lowerArr[i]));
	}
	set = new CharArraySet(Arrays.asList(TEST_STOP_WORDS),
	false);
	for (String upper : upperArr) {
	set.add(upper);
	}
	for (int i = 0; i < upperArr.length; i++) {
	assertTrue(String.format(Locale.ROOT, missing, upperArr[i]), set.contains(upperArr[i]));
	assertFalse(String.format(Locale.ROOT, falsePos, upperArr[i]), set
	.contains(lowerArr[i]));
	}
	}

	@SuppressWarnings("deprecated")
	public void testCopyCharArraySetBWCompat() {
	CharArraySet setIngoreCase = new CharArraySet(10, true);
	CharArraySet setCaseSensitive = new CharArraySet(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(setIngoreCase);
	CharArraySet copyCaseSens = CharArraySet.copy(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));

	}
	}

	/**
	* Test the static #copy() function with a CharArraySet as a source
	*/
	public void testCopyCharArraySet() {
	CharArraySet setIngoreCase = new CharArraySet(10, true);
	CharArraySet setCaseSensitive = new CharArraySet(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(setIngoreCase);
	CharArraySet copyCaseSens = CharArraySet.copy(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));

	}
	}

	/**
	* 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(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));
	}
	}

	/**
	* Tests a special case of {@link CharArraySet#copy(Set)} where the
	* set to copy is the {@link CharArraySet#EMPTY_SET}
	*/
	public void testCopyEmptySet() {
	assertSame(CharArraySet.EMPTY_SET,
	CharArraySet.copy(CharArraySet.EMPTY_SET));
	}

	/**
	* Smoketests the static empty set
	*/
	public void testEmptySet() {
	assertEquals(0, CharArraySet.EMPTY_SET.size());

	assertTrue(CharArraySet.EMPTY_SET.isEmpty());
	for (String stopword : TEST_STOP_WORDS) {
	assertFalse(CharArraySet.EMPTY_SET.contains(stopword));
	}
	assertFalse(CharArraySet.EMPTY_SET.contains("foo"));
	assertFalse(CharArraySet.EMPTY_SET.contains((Object) "foo"));
	assertFalse(CharArraySet.EMPTY_SET.contains("foo".toCharArray()));
	assertFalse(CharArraySet.EMPTY_SET.contains("foo".toCharArray(),0,3));
	}

	/**
	* Test for NPE
	*/
	public void testContainsWithNull() {
	CharArraySet set = new CharArraySet(1, true);

	expectThrows(NullPointerException.class, () -> {
	set.contains((char[]) null, 0, 10);
	});

	expectThrows(NullPointerException.class, () -> {
	set.contains((CharSequence) null);
	});

	expectThrows(NullPointerException.class, () -> {
	set.contains((Object) null);
	});
	}

	public void testToString() {
	CharArraySet set = CharArraySet.copy(Collections.singleton("test"));
	assertEquals("[test]", set.toString());
	set.add("test2");
	assertTrue(set.toString().contains(", "));
	}
	}