test/tck/CopyOnWriteArraySetTest.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

import junit.framework.Test;

public class CopyOnWriteArraySetTest extends JSR166TestCase {
    public static void main(String[] args) {
        main(suite(), args);
    }
    public static Test suite() {
        class Implementation implements CollectionImplementation {
            public Class<?> klazz() { return CopyOnWriteArraySet.class; }
            public Set emptyCollection() { return new CopyOnWriteArraySet(); }
            public Object makeElement(int i) { return JSR166TestCase.itemFor(i); }
            public boolean isConcurrent() { return true; }
            public boolean permitsNulls() { return true; }
        }
        return newTestSuite(
                CopyOnWriteArraySetTest.class,
                CollectionTest.testSuite(new Implementation()));
    }

    static CopyOnWriteArraySet<Item> populatedSet(int n) {
        CopyOnWriteArraySet<Item> a = new CopyOnWriteArraySet<>();
        assertTrue(a.isEmpty());
        for (int i = 0; i < n; i++)
            mustAdd(a, i);
        mustEqual(n == 0, a.isEmpty());
        mustEqual(n, a.size());
        return a;
    }

    static CopyOnWriteArraySet<Item> populatedSet(Item[] elements) {
        CopyOnWriteArraySet<Item> a = new CopyOnWriteArraySet<>();
        assertTrue(a.isEmpty());
        for (int i = 0; i < elements.length; i++)
            mustAdd(a, elements[i]);
        assertFalse(a.isEmpty());
        mustEqual(elements.length, a.size());
        return a;
    }

    /**
     * Default-constructed set is empty
     */
    public void testConstructor() {
        CopyOnWriteArraySet<Item> a = new CopyOnWriteArraySet<>();
        assertTrue(a.isEmpty());
    }

    /**
     * Collection-constructed set holds all of its elements
     */
    public void testConstructor3() {
        Item[] items = defaultItems;
        CopyOnWriteArraySet<Item> a = new CopyOnWriteArraySet<>(Arrays.asList(items));
        for (int i = 0; i < SIZE; ++i)
            mustContain(a, i);
    }

    /**
     * addAll adds each non-duplicate element from the given collection
     */
    public void testAddAll() {
        Set<Item> full = populatedSet(3);
        assertTrue(full.addAll(Arrays.asList(three, four, five)));
        mustEqual(6, full.size());
        assertFalse(full.addAll(Arrays.asList(three, four, five)));
        mustEqual(6, full.size());
    }

    /**
     * addAll adds each non-duplicate element from the given collection
     */
    public void testAddAll2() {
        Set<Item> full = populatedSet(3);
        // "one" is duplicate and will not be added
        assertTrue(full.addAll(Arrays.asList(three, four, one)));
        mustEqual(5, full.size());
        assertFalse(full.addAll(Arrays.asList(three, four, one)));
        mustEqual(5, full.size());
    }

    /**
     * add will not add the element if it already exists in the set
     */
    public void testAdd2() {
        Set<Item> full = populatedSet(3);
        full.add(one);
        mustEqual(3, full.size());
    }

    /**
     * add adds the element when it does not exist in the set
     */
    public void testAdd3() {
        Set<Item> full = populatedSet(3);
        full.add(three);
        mustContain(full, three);
    }

    /**
     * clear removes all elements from the set
     */
    public void testClear() {
        Collection<Item> full = populatedSet(3);
        full.clear();
        mustEqual(0, full.size());
        assertTrue(full.isEmpty());
    }

    /**
     * contains returns true for added elements
     */
    public void testContains() {
        Collection<Item> full = populatedSet(3);
        mustContain(full, one);
        mustNotContain(full, five);
    }

    /**
     * Sets with equal elements are equal
     */
    public void testEquals() {
        CopyOnWriteArraySet<Item> a = populatedSet(3);
        CopyOnWriteArraySet<Item> b = populatedSet(3);
        assertTrue(a.equals(b));
        assertTrue(b.equals(a));
        assertTrue(a.containsAll(b));
        assertTrue(b.containsAll(a));
        mustEqual(a.hashCode(), b.hashCode());
        mustEqual(a.size(), b.size());

        a.add(minusOne);
        assertFalse(a.equals(b));
        assertFalse(b.equals(a));
        assertTrue(a.containsAll(b));
        assertFalse(b.containsAll(a));
        b.add(minusOne);
        assertTrue(a.equals(b));
        assertTrue(b.equals(a));
        assertTrue(a.containsAll(b));
        assertTrue(b.containsAll(a));
        mustEqual(a.hashCode(), b.hashCode());

        Item x = a.iterator().next();
        a.remove(x);
        assertFalse(a.equals(b));
        assertFalse(b.equals(a));
        assertFalse(a.containsAll(b));
        assertTrue(b.containsAll(a));
        a.add(x);
        assertTrue(a.equals(b));
        assertTrue(b.equals(a));
        assertTrue(a.containsAll(b));
        assertTrue(b.containsAll(a));
        mustEqual(a.hashCode(), b.hashCode());
        mustEqual(a.size(), b.size());

        CopyOnWriteArraySet<Item> empty1 = new CopyOnWriteArraySet<>(Arrays.asList());
        CopyOnWriteArraySet<Item> empty2 = new CopyOnWriteArraySet<>(Arrays.asList());
        assertTrue(empty1.equals(empty1));
        assertTrue(empty1.equals(empty2));

        assertFalse(empty1.equals(a));
        assertFalse(a.equals(empty1));

        assertFalse(a.equals(null));
    }

    /**
     * containsAll returns true for collections with subset of elements
     */
    public void testContainsAll() {
        Collection<Item> full = populatedSet(3);
        assertTrue(full.containsAll(full));
        assertTrue(full.containsAll(Arrays.asList()));
        assertTrue(full.containsAll(Arrays.asList(one)));
        assertTrue(full.containsAll(Arrays.asList(one, two)));
        assertFalse(full.containsAll(Arrays.asList(one, two, six)));
        assertFalse(full.containsAll(Arrays.asList(six)));

        CopyOnWriteArraySet<Item> empty1 = new CopyOnWriteArraySet<>(Arrays.asList());
        CopyOnWriteArraySet<Item> empty2 = new CopyOnWriteArraySet<>(Arrays.asList());
        assertTrue(empty1.containsAll(empty2));
        assertTrue(empty1.containsAll(empty1));
        assertFalse(empty1.containsAll(full));
        assertTrue(full.containsAll(empty1));

        try {
            full.containsAll(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * isEmpty is true when empty, else false
     */
    public void testIsEmpty() {
        assertTrue(populatedSet(0).isEmpty());
        assertFalse(populatedSet(3).isEmpty());
    }

    /**
     * iterator() returns an iterator containing the elements of the
     * set in insertion order
     */
    public void testIterator() {
        Collection<Item> empty = new CopyOnWriteArraySet<>();
        assertFalse(empty.iterator().hasNext());
        try {
            empty.iterator().next();
            shouldThrow();
        } catch (NoSuchElementException success) {}

        Item[] elements = seqItems(SIZE);
        shuffle(elements);
        Collection<Item> full = populatedSet(elements);

        Iterator<? extends Item> it = full.iterator();
        for (int j = 0; j < SIZE; j++) {
            assertTrue(it.hasNext());
            mustEqual(elements[j], it.next());
        }
        assertIteratorExhausted(it);
    }

    /**
     * iterator of empty collection has no elements
     */
    public void testEmptyIterator() {
        assertIteratorExhausted(new CopyOnWriteArraySet<Item>().iterator());
    }

    /**
     * iterator remove is unsupported
     */
    public void testIteratorRemove() {
        Collection<Item> full = populatedSet(3);
        Iterator<? extends Item> it = full.iterator();
        it.next();
        try {
            it.remove();
            shouldThrow();
        } catch (UnsupportedOperationException success) {}
    }

    /**
     * toString holds toString of elements
     */
    public void testToString() {
        mustEqual("[]", new CopyOnWriteArraySet<Item>().toString());
        Collection<Item> full = populatedSet(3);
        String s = full.toString();
        for (int i = 0; i < 3; ++i)
            assertTrue(s.contains(String.valueOf(i)));
        mustEqual(new ArrayList<Item>(full).toString(),
                     full.toString());
    }

    /**
     * removeAll removes all elements from the given collection
     */
    public void testRemoveAll() {
        Set<Item> full = populatedSet(3);
        assertTrue(full.removeAll(Arrays.asList(one, two)));
        mustEqual(1, full.size());
        assertFalse(full.removeAll(Arrays.asList(one, two)));
        mustEqual(1, full.size());
    }

    /**
     * remove removes an element
     */
    public void testRemove() {
        Collection<Item> full = populatedSet(3);
        full.remove(one);
        mustNotContain(full, one);
        mustEqual(2, full.size());
    }

    /**
     * size returns the number of elements
     */
    public void testSize() {
        Collection<Item> empty = new CopyOnWriteArraySet<>();
        Collection<Item> full = populatedSet(3);
        mustEqual(3, full.size());
        mustEqual(0, empty.size());
    }

    /**
     * toArray() returns an Object array containing all elements from
     * the set in insertion order
     */
    public void testToArray() {
        Object[] a = new CopyOnWriteArraySet<>().toArray();
        assertTrue(Arrays.equals(new Object[0], a));
        assertSame(Object[].class, a.getClass());

        Item[] elements = seqItems(SIZE);
        shuffle(elements);
        Collection<Item> full = populatedSet(elements);

        assertTrue(Arrays.equals(elements, full.toArray()));
        assertSame(Object[].class, full.toArray().getClass());
    }

    /**
     * toArray(Item array) returns an Item array containing all
     * elements from the set in insertion order
     */
    public void testToArray2() {
        Collection<Item> empty = new CopyOnWriteArraySet<>();
        Item[] a;

        a = new Item[0];
        assertSame(a, empty.toArray(a));

        a = new Item[SIZE / 2];
        Arrays.fill(a, fortytwo);
        assertSame(a, empty.toArray(a));
        assertNull(a[0]);
        for (int i = 1; i < a.length; i++)
            mustEqual(42, a[i]);

        Item[] elements = seqItems(SIZE);
        shuffle(elements);
        Collection<Item> full = populatedSet(elements);

        Arrays.fill(a, fortytwo);
        assertTrue(Arrays.equals(elements, full.toArray(a)));
        for (int i = 0; i < a.length; i++)
            mustEqual(42, a[i]);
        assertSame(Item[].class, full.toArray(a).getClass());

        a = new Item[SIZE];
        Arrays.fill(a, fortytwo);
        assertSame(a, full.toArray(a));
        assertTrue(Arrays.equals(elements, a));

        a = new Item[2 * SIZE];
        Arrays.fill(a, fortytwo);
        assertSame(a, full.toArray(a));
        assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE)));
        assertNull(a[SIZE]);
        for (int i = SIZE + 1; i < a.length; i++)
            mustEqual(42, a[i]);
    }

    /**
     * toArray throws an ArrayStoreException when the given array can
     * not store the objects inside the set
     */
    @SuppressWarnings("CollectionToArraySafeParameter")
    public void testToArray_ArrayStoreException() {
        CopyOnWriteArraySet<Item> c = new CopyOnWriteArraySet<>();
        c.add(one);
        c.add(two);
        try {
            c.toArray(new Long[5]);
            shouldThrow();
        } catch (ArrayStoreException success) {}
    }

    /**
     * A deserialized/reserialized set equals original
     */
    public void testSerialization() throws Exception {
        Set<Item> x = populatedSet(SIZE);
        Set<Item> y = serialClone(x);

        assertNotSame(y, x);
        mustEqual(x.size(), y.size());
        mustEqual(x.toString(), y.toString());
        assertTrue(Arrays.equals(x.toArray(), y.toArray()));
        mustEqual(x, y);
        mustEqual(y, x);
    }

    /**
     * addAll is idempotent
     */
    public void testAddAll_idempotent() throws Exception {
        Set<Item> x = populatedSet(SIZE);
        Set<Item> y = new CopyOnWriteArraySet<>(x);
        y.addAll(x);
        mustEqual(x, y);
        mustEqual(y, x);
    }

}
Revision:	1.44
Committed:	Wed Jan 27 02:55:18 2021 UTC (3 years, 3 months ago) by jsr166
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.43:	+1 -0 lines
Log Message:	Suppress all new errorprone "errors"
#	User	Rev	Content
1	dl	1.1	/*
2	dl	1.6	* Written by Doug Lea with assistance from members of JCP JSR-166
3			* Expert Group and released to the public domain, as explained at
4	jsr166	1.17	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.8	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9	jsr166	1.25	import java.util.ArrayList;
10	jsr166	1.19	import java.util.Arrays;
11	jsr166	1.22	import java.util.Collection;
12	jsr166	1.19	import java.util.Iterator;
13	jsr166	1.24	import java.util.NoSuchElementException;
14	jsr166	1.19	import java.util.Set;
15			import java.util.concurrent.CopyOnWriteArraySet;
16	dl	1.1
17	jsr166	1.28	import junit.framework.Test;
18
19	dl	1.3	public class CopyOnWriteArraySetTest extends JSR166TestCase {
20	dl	1.1	public static void main(String[] args) {
21	jsr166	1.32	main(suite(), args);
22	dl	1.1	}
23			public static Test suite() {
24	jsr166	1.40	class Implementation implements CollectionImplementation {
25			public Class<?> klazz() { return CopyOnWriteArraySet.class; }
26			public Set emptyCollection() { return new CopyOnWriteArraySet(); }
27	dl	1.42	public Object makeElement(int i) { return JSR166TestCase.itemFor(i); }
28	jsr166	1.40	public boolean isConcurrent() { return true; }
29			public boolean permitsNulls() { return true; }
30			}
31			return newTestSuite(
32			CopyOnWriteArraySetTest.class,
33			CollectionTest.testSuite(new Implementation()));
34	dl	1.1	}
35
36	dl	1.42	static CopyOnWriteArraySet<Item> populatedSet(int n) {
37			CopyOnWriteArraySet<Item> a = new CopyOnWriteArraySet<>();
38	dl	1.1	assertTrue(a.isEmpty());
39	jsr166	1.22	for (int i = 0; i < n; i++)
40	dl	1.42	mustAdd(a, i);
41			mustEqual(n == 0, a.isEmpty());
42			mustEqual(n, a.size());
43	dl	1.1	return a;
44			}
45
46	dl	1.42	static CopyOnWriteArraySet<Item> populatedSet(Item[] elements) {
47			CopyOnWriteArraySet<Item> a = new CopyOnWriteArraySet<>();
48	jsr166	1.21	assertTrue(a.isEmpty());
49			for (int i = 0; i < elements.length; i++)
50	dl	1.42	mustAdd(a, elements[i]);
51	jsr166	1.21	assertFalse(a.isEmpty());
52	dl	1.42	mustEqual(elements.length, a.size());
53	jsr166	1.21	return a;
54			}
55
56	dl	1.4	/**
57			* Default-constructed set is empty
58			*/
59	dl	1.3	public void testConstructor() {
60	jsr166	1.43	CopyOnWriteArraySet<Item> a = new CopyOnWriteArraySet<>();
61	dl	1.3	assertTrue(a.isEmpty());
62			}
63
64	dl	1.4	/**
65	dl	1.5	* Collection-constructed set holds all of its elements
66	dl	1.4	*/
67	dl	1.3	public void testConstructor3() {
68	dl	1.42	Item[] items = defaultItems;
69	jsr166	1.43	CopyOnWriteArraySet<Item> a = new CopyOnWriteArraySet<>(Arrays.asList(items));
70	jsr166	1.8	for (int i = 0; i < SIZE; ++i)
71	dl	1.42	mustContain(a, i);
72	dl	1.3	}
73	jsr166	1.8
74	dl	1.1	/**
75	jsr166	1.31	* addAll adds each non-duplicate element from the given collection
76	dl	1.1	*/
77	dl	1.4	public void testAddAll() {
78	dl	1.42	Set<Item> full = populatedSet(3);
79	jsr166	1.30	assertTrue(full.addAll(Arrays.asList(three, four, five)));
80	dl	1.42	mustEqual(6, full.size());
81	jsr166	1.30	assertFalse(full.addAll(Arrays.asList(three, four, five)));
82	dl	1.42	mustEqual(6, full.size());
83	dl	1.1	}
84
85			/**
86	jsr166	1.31	* addAll adds each non-duplicate element from the given collection
87	dl	1.1	*/
88	dl	1.4	public void testAddAll2() {
89	dl	1.42	Set<Item> full = populatedSet(3);
90	jsr166	1.30	// "one" is duplicate and will not be added
91			assertTrue(full.addAll(Arrays.asList(three, four, one)));
92	dl	1.42	mustEqual(5, full.size());
93	jsr166	1.30	assertFalse(full.addAll(Arrays.asList(three, four, one)));
94	dl	1.42	mustEqual(5, full.size());
95	dl	1.1	}
96
97			/**
98	jsr166	1.16	* add will not add the element if it already exists in the set
99	dl	1.1	*/
100	dl	1.4	public void testAdd2() {
101	dl	1.42	Set<Item> full = populatedSet(3);
102	jsr166	1.11	full.add(one);
103	dl	1.42	mustEqual(3, full.size());
104	dl	1.1	}
105
106			/**
107	jsr166	1.16	* add adds the element when it does not exist in the set
108	dl	1.1	*/
109	dl	1.4	public void testAdd3() {
110	dl	1.42	Set<Item> full = populatedSet(3);
111	dl	1.3	full.add(three);
112	dl	1.42	mustContain(full, three);
113	dl	1.1	}
114
115			/**
116	jsr166	1.16	* clear removes all elements from the set
117	dl	1.1	*/
118	dl	1.4	public void testClear() {
119	dl	1.42	Collection<Item> full = populatedSet(3);
120	jsr166	1.11	full.clear();
121	dl	1.42	mustEqual(0, full.size());
122	jsr166	1.31	assertTrue(full.isEmpty());
123	dl	1.1	}
124
125			/**
126	jsr166	1.16	* contains returns true for added elements
127	dl	1.1	*/
128	dl	1.4	public void testContains() {
129	dl	1.42	Collection<Item> full = populatedSet(3);
130			mustContain(full, one);
131			mustNotContain(full, five);
132	dl	1.1	}
133
134	dl	1.4	/**
135			* Sets with equal elements are equal
136			*/
137	dl	1.1	public void testEquals() {
138	dl	1.42	CopyOnWriteArraySet<Item> a = populatedSet(3);
139			CopyOnWriteArraySet<Item> b = populatedSet(3);
140	dl	1.1	assertTrue(a.equals(b));
141			assertTrue(b.equals(a));
142	jsr166	1.35	assertTrue(a.containsAll(b));
143			assertTrue(b.containsAll(a));
144	dl	1.42	mustEqual(a.hashCode(), b.hashCode());
145			mustEqual(a.size(), b.size());
146	jsr166	1.35
147	dl	1.42	a.add(minusOne);
148	dl	1.1	assertFalse(a.equals(b));
149			assertFalse(b.equals(a));
150	jsr166	1.35	assertTrue(a.containsAll(b));
151			assertFalse(b.containsAll(a));
152	dl	1.42	b.add(minusOne);
153	dl	1.1	assertTrue(a.equals(b));
154			assertTrue(b.equals(a));
155	jsr166	1.35	assertTrue(a.containsAll(b));
156			assertTrue(b.containsAll(a));
157	dl	1.42	mustEqual(a.hashCode(), b.hashCode());
158	jsr166	1.35
159	dl	1.42	Item x = a.iterator().next();
160	jsr166	1.35	a.remove(x);
161			assertFalse(a.equals(b));
162			assertFalse(b.equals(a));
163			assertFalse(a.containsAll(b));
164			assertTrue(b.containsAll(a));
165			a.add(x);
166			assertTrue(a.equals(b));
167			assertTrue(b.equals(a));
168			assertTrue(a.containsAll(b));
169			assertTrue(b.containsAll(a));
170	dl	1.42	mustEqual(a.hashCode(), b.hashCode());
171			mustEqual(a.size(), b.size());
172	jsr166	1.35
173	jsr166	1.43	CopyOnWriteArraySet<Item> empty1 = new CopyOnWriteArraySet<>(Arrays.asList());
174			CopyOnWriteArraySet<Item> empty2 = new CopyOnWriteArraySet<>(Arrays.asList());
175	jsr166	1.35	assertTrue(empty1.equals(empty1));
176			assertTrue(empty1.equals(empty2));
177
178			assertFalse(empty1.equals(a));
179			assertFalse(a.equals(empty1));
180
181			assertFalse(a.equals(null));
182	dl	1.1	}
183
184			/**
185	jsr166	1.16	* containsAll returns true for collections with subset of elements
186	dl	1.1	*/
187	dl	1.4	public void testContainsAll() {
188	dl	1.42	Collection<Item> full = populatedSet(3);
189	jsr166	1.35	assertTrue(full.containsAll(full));
190	jsr166	1.30	assertTrue(full.containsAll(Arrays.asList()));
191			assertTrue(full.containsAll(Arrays.asList(one)));
192			assertTrue(full.containsAll(Arrays.asList(one, two)));
193			assertFalse(full.containsAll(Arrays.asList(one, two, six)));
194			assertFalse(full.containsAll(Arrays.asList(six)));
195	jsr166	1.35
196	jsr166	1.43	CopyOnWriteArraySet<Item> empty1 = new CopyOnWriteArraySet<>(Arrays.asList());
197			CopyOnWriteArraySet<Item> empty2 = new CopyOnWriteArraySet<>(Arrays.asList());
198	jsr166	1.35	assertTrue(empty1.containsAll(empty2));
199			assertTrue(empty1.containsAll(empty1));
200			assertFalse(empty1.containsAll(full));
201			assertTrue(full.containsAll(empty1));
202
203			try {
204			full.containsAll(null);
205			shouldThrow();
206			} catch (NullPointerException success) {}
207	dl	1.1	}
208
209			/**
210	jsr166	1.16	* isEmpty is true when empty, else false
211	dl	1.1	*/
212	dl	1.4	public void testIsEmpty() {
213	jsr166	1.31	assertTrue(populatedSet(0).isEmpty());
214			assertFalse(populatedSet(3).isEmpty());
215	dl	1.1	}
216
217			/**
218	jsr166	1.24	* iterator() returns an iterator containing the elements of the
219			* set in insertion order
220	dl	1.1	*/
221	dl	1.4	public void testIterator() {
222	jsr166	1.43	Collection<Item> empty = new CopyOnWriteArraySet<>();
223	jsr166	1.24	assertFalse(empty.iterator().hasNext());
224			try {
225			empty.iterator().next();
226			shouldThrow();
227			} catch (NoSuchElementException success) {}
228
229	dl	1.42	Item[] elements = seqItems(SIZE);
230	jsr166	1.36	shuffle(elements);
231	dl	1.42	Collection<Item> full = populatedSet(elements);
232	jsr166	1.24
233	dl	1.42	Iterator<? extends Item> it = full.iterator();
234	jsr166	1.24	for (int j = 0; j < SIZE; j++) {
235			assertTrue(it.hasNext());
236	dl	1.42	mustEqual(elements[j], it.next());
237	jsr166	1.24	}
238	jsr166	1.29	assertIteratorExhausted(it);
239			}
240
241			/**
242			* iterator of empty collection has no elements
243			*/
244			public void testEmptyIterator() {
245	dl	1.42	assertIteratorExhausted(new CopyOnWriteArraySet<Item>().iterator());
246	dl	1.1	}
247
248	dl	1.4	/**
249			* iterator remove is unsupported
250			*/
251	jsr166	1.15	public void testIteratorRemove() {
252	dl	1.42	Collection<Item> full = populatedSet(3);
253			Iterator<? extends Item> it = full.iterator();
254	dl	1.1	it.next();
255			try {
256			it.remove();
257	dl	1.4	shouldThrow();
258	jsr166	1.12	} catch (UnsupportedOperationException success) {}
259	dl	1.1	}
260
261	dl	1.4	/**
262			* toString holds toString of elements
263			*/
264			public void testToString() {
265	dl	1.42	mustEqual("[]", new CopyOnWriteArraySet<Item>().toString());
266			Collection<Item> full = populatedSet(3);
267	dl	1.1	String s = full.toString();
268	jsr166	1.25	for (int i = 0; i < 3; ++i)
269	jsr166	1.18	assertTrue(s.contains(String.valueOf(i)));
270	dl	1.42	mustEqual(new ArrayList<Item>(full).toString(),
271	jsr166	1.25	full.toString());
272	jsr166	1.8	}
273	dl	1.1
274			/**
275	jsr166	1.16	* removeAll removes all elements from the given collection
276	dl	1.1	*/
277	dl	1.4	public void testRemoveAll() {
278	dl	1.42	Set<Item> full = populatedSet(3);
279	jsr166	1.30	assertTrue(full.removeAll(Arrays.asList(one, two)));
280	dl	1.42	mustEqual(1, full.size());
281	jsr166	1.30	assertFalse(full.removeAll(Arrays.asList(one, two)));
282	dl	1.42	mustEqual(1, full.size());
283	dl	1.1	}
284
285	dl	1.4	/**
286			* remove removes an element
287			*/
288			public void testRemove() {
289	dl	1.42	Collection<Item> full = populatedSet(3);
290	jsr166	1.11	full.remove(one);
291	dl	1.42	mustNotContain(full, one);
292			mustEqual(2, full.size());
293	dl	1.1	}
294
295			/**
296	jsr166	1.16	* size returns the number of elements
297	dl	1.1	*/
298	dl	1.4	public void testSize() {
299	jsr166	1.43	Collection<Item> empty = new CopyOnWriteArraySet<>();
300	dl	1.42	Collection<Item> full = populatedSet(3);
301			mustEqual(3, full.size());
302			mustEqual(0, empty.size());
303	dl	1.1	}
304
305			/**
306	jsr166	1.21	* toArray() returns an Object array containing all elements from
307			* the set in insertion order
308	dl	1.1	*/
309	dl	1.4	public void testToArray() {
310	jsr166	1.43	Object[] a = new CopyOnWriteArraySet<>().toArray();
311	jsr166	1.21	assertTrue(Arrays.equals(new Object[0], a));
312			assertSame(Object[].class, a.getClass());
313
314	dl	1.42	Item[] elements = seqItems(SIZE);
315	jsr166	1.36	shuffle(elements);
316	dl	1.42	Collection<Item> full = populatedSet(elements);
317	jsr166	1.21
318			assertTrue(Arrays.equals(elements, full.toArray()));
319			assertSame(Object[].class, full.toArray().getClass());
320	dl	1.1	}
321
322			/**
323	dl	1.42	* toArray(Item array) returns an Item array containing all
324	jsr166	1.21	* elements from the set in insertion order
325	dl	1.1	*/
326	dl	1.4	public void testToArray2() {
327	jsr166	1.43	Collection<Item> empty = new CopyOnWriteArraySet<>();
328	dl	1.42	Item[] a;
329	jsr166	1.21
330	dl	1.42	a = new Item[0];
331	jsr166	1.21	assertSame(a, empty.toArray(a));
332
333	dl	1.42	a = new Item[SIZE / 2];
334			Arrays.fill(a, fortytwo);
335	jsr166	1.21	assertSame(a, empty.toArray(a));
336			assertNull(a[0]);
337			for (int i = 1; i < a.length; i++)
338	dl	1.42	mustEqual(42, a[i]);
339	jsr166	1.21
340	dl	1.42	Item[] elements = seqItems(SIZE);
341	jsr166	1.36	shuffle(elements);
342	dl	1.42	Collection<Item> full = populatedSet(elements);
343	jsr166	1.21
344	dl	1.42	Arrays.fill(a, fortytwo);
345	jsr166	1.21	assertTrue(Arrays.equals(elements, full.toArray(a)));
346			for (int i = 0; i < a.length; i++)
347	dl	1.42	mustEqual(42, a[i]);
348			assertSame(Item[].class, full.toArray(a).getClass());
349	jsr166	1.21
350	dl	1.42	a = new Item[SIZE];
351			Arrays.fill(a, fortytwo);
352	jsr166	1.21	assertSame(a, full.toArray(a));
353			assertTrue(Arrays.equals(elements, a));
354
355	dl	1.42	a = new Item[2 * SIZE];
356			Arrays.fill(a, fortytwo);
357	jsr166	1.21	assertSame(a, full.toArray(a));
358			assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE)));
359			assertNull(a[SIZE]);
360			for (int i = SIZE + 1; i < a.length; i++)
361	dl	1.42	mustEqual(42, a[i]);
362	dl	1.1	}
363
364			/**
365	jsr166	1.16	* toArray throws an ArrayStoreException when the given array can
366			* not store the objects inside the set
367	dl	1.1	*/
368	jsr166	1.44	@SuppressWarnings("CollectionToArraySafeParameter")
369	dl	1.4	public void testToArray_ArrayStoreException() {
370	jsr166	1.43	CopyOnWriteArraySet<Item> c = new CopyOnWriteArraySet<>();
371	dl	1.42	c.add(one);
372			c.add(two);
373	dl	1.4	try {
374	dl	1.1	c.toArray(new Long[5]);
375	jsr166	1.11	shouldThrow();
376	jsr166	1.13	} catch (ArrayStoreException success) {}
377	dl	1.2	}
378
379	dl	1.4	/**
380	jsr166	1.39	* A deserialized/reserialized set equals original
381	dl	1.4	*/
382	jsr166	1.12	public void testSerialization() throws Exception {
383	dl	1.42	Set<Item> x = populatedSet(SIZE);
384			Set<Item> y = serialClone(x);
385	dl	1.2
386	jsr166	1.27	assertNotSame(y, x);
387	dl	1.42	mustEqual(x.size(), y.size());
388			mustEqual(x.toString(), y.toString());
389	jsr166	1.23	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
390	dl	1.42	mustEqual(x, y);
391			mustEqual(y, x);
392	dl	1.1	}
393
394	jsr166	1.26	/**
395			* addAll is idempotent
396			*/
397			public void testAddAll_idempotent() throws Exception {
398	dl	1.42	Set<Item> x = populatedSet(SIZE);
399	jsr166	1.43	Set<Item> y = new CopyOnWriteArraySet<>(x);
400	jsr166	1.26	y.addAll(x);
401	dl	1.42	mustEqual(x, y);
402			mustEqual(y, x);
403	jsr166	1.26	}
404
405	dl	1.1	}