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.Collections;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

import junit.framework.Test;
import junit.framework.TestSuite;

public class CopyOnWriteArraySetTest extends JSR166TestCase {
    public static void main(String[] args) {
        main(suite(), args);
    }
    public static Test suite() {
        return new TestSuite(CopyOnWriteArraySetTest.class);
    }

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

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

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

    /**
     * Collection-constructed set holds all of its elements
     */
    public void testConstructor3() {
        Integer[] ints = new Integer[SIZE];
        for (int i = 0; i < SIZE - 1; ++i)
            ints[i] = new Integer(i);
        CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints));
        for (int i = 0; i < SIZE; ++i)
            assertTrue(a.contains(ints[i]));
    }

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

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

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

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

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

    /**
     * contains returns true for added elements
     */
    public void testContains() {
        Collection full = populatedSet(3);
        assertTrue(full.contains(one));
        assertFalse(full.contains(five));
    }

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

        a.add(m1);
        assertFalse(a.equals(b));
        assertFalse(b.equals(a));
        assertTrue(a.containsAll(b));
        assertFalse(b.containsAll(a));
        b.add(m1);
        assertTrue(a.equals(b));
        assertTrue(b.equals(a));
        assertTrue(a.containsAll(b));
        assertTrue(b.containsAll(a));
        assertEquals(a.hashCode(), b.hashCode());

        Object 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));
        assertEquals(a.hashCode(), b.hashCode());
        assertEquals(a.size(), b.size());

        CopyOnWriteArraySet empty1 = new CopyOnWriteArraySet(Arrays.asList());
        CopyOnWriteArraySet 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 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 empty1 = new CopyOnWriteArraySet(Arrays.asList());
        CopyOnWriteArraySet 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 empty = new CopyOnWriteArraySet();
        assertFalse(empty.iterator().hasNext());
        try {
            empty.iterator().next();
            shouldThrow();
        } catch (NoSuchElementException success) {}

        Integer[] elements = new Integer[SIZE];
        for (int i = 0; i < SIZE; i++)
            elements[i] = i;
        shuffle(elements);
        Collection<Integer> full = populatedSet(elements);

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

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

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

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

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

    /**
     * remove removes an element
     */
    public void testRemove() {
        Collection full = populatedSet(3);
        full.remove(one);
        assertFalse(full.contains(one));
        assertEquals(2, full.size());
    }

    /**
     * size returns the number of elements
     */
    public void testSize() {
        Collection empty = new CopyOnWriteArraySet();
        Collection full = populatedSet(3);
        assertEquals(3, full.size());
        assertEquals(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());

        Integer[] elements = new Integer[SIZE];
        for (int i = 0; i < SIZE; i++)
            elements[i] = i;
        shuffle(elements);
        Collection<Integer> full = populatedSet(elements);

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

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

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

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

        Integer[] elements = new Integer[SIZE];
        for (int i = 0; i < SIZE; i++)
            elements[i] = i;
        shuffle(elements);
        Collection<Integer> full = populatedSet(elements);

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

        a = new Integer[SIZE];
        Arrays.fill(a, 42);
        assertSame(a, full.toArray(a));
        assertTrue(Arrays.equals(elements, a));

        a = new Integer[2 * SIZE];
        Arrays.fill(a, 42);
        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++)
            assertEquals(42, (int) a[i]);
    }

    /**
     * toArray throws an ArrayStoreException when the given array can
     * not store the objects inside the set
     */
    public void testToArray_ArrayStoreException() {
        CopyOnWriteArraySet c = new CopyOnWriteArraySet();
        c.add("zfasdfsdf");
        c.add("asdadasd");
        try {
            c.toArray(new Long[5]);
            shouldThrow();
        } catch (ArrayStoreException success) {}
    }

    /**
     * A deserialized serialized set is equal
     */
    public void testSerialization() throws Exception {
        Set x = populatedSet(SIZE);
        Set y = serialClone(x);

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

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

}
Revision:	1.36
Committed:	Wed Aug 10 01:28:14 2016 UTC (7 years, 9 months ago) by jsr166
Branch:	MAIN
Changes since 1.35:	+3 -3 lines
Log Message:	introduce shuffle(T[]) utility method
#	Content
1	/*
2	* 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	* http://creativecommons.org/publicdomain/zero/1.0/
5	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	* Pat Fisher, Mike Judd.
7	*/
8
9	import java.util.ArrayList;
10	import java.util.Arrays;
11	import java.util.Collection;
12	import java.util.Collections;
13	import java.util.Iterator;
14	import java.util.NoSuchElementException;
15	import java.util.Set;
16	import java.util.concurrent.CopyOnWriteArraySet;
17
18	import junit.framework.Test;
19	import junit.framework.TestSuite;
20
21	public class CopyOnWriteArraySetTest extends JSR166TestCase {
22	public static void main(String[] args) {
23	main(suite(), args);
24	}
25	public static Test suite() {
26	return new TestSuite(CopyOnWriteArraySetTest.class);
27	}
28
29	static CopyOnWriteArraySet<Integer> populatedSet(int n) {
30	CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
31	assertTrue(a.isEmpty());
32	for (int i = 0; i < n; i++)
33	a.add(i);
34	assertEquals(n == 0, a.isEmpty());
35	assertEquals(n, a.size());
36	return a;
37	}
38
39	static CopyOnWriteArraySet populatedSet(Integer[] elements) {
40	CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
41	assertTrue(a.isEmpty());
42	for (int i = 0; i < elements.length; i++)
43	a.add(elements[i]);
44	assertFalse(a.isEmpty());
45	assertEquals(elements.length, a.size());
46	return a;
47	}
48
49	/**
50	* Default-constructed set is empty
51	*/
52	public void testConstructor() {
53	CopyOnWriteArraySet a = new CopyOnWriteArraySet();
54	assertTrue(a.isEmpty());
55	}
56
57	/**
58	* Collection-constructed set holds all of its elements
59	*/
60	public void testConstructor3() {
61	Integer[] ints = new Integer[SIZE];
62	for (int i = 0; i < SIZE - 1; ++i)
63	ints[i] = new Integer(i);
64	CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints));
65	for (int i = 0; i < SIZE; ++i)
66	assertTrue(a.contains(ints[i]));
67	}
68
69	/**
70	* addAll adds each non-duplicate element from the given collection
71	*/
72	public void testAddAll() {
73	Set full = populatedSet(3);
74	assertTrue(full.addAll(Arrays.asList(three, four, five)));
75	assertEquals(6, full.size());
76	assertFalse(full.addAll(Arrays.asList(three, four, five)));
77	assertEquals(6, full.size());
78	}
79
80	/**
81	* addAll adds each non-duplicate element from the given collection
82	*/
83	public void testAddAll2() {
84	Set full = populatedSet(3);
85	// "one" is duplicate and will not be added
86	assertTrue(full.addAll(Arrays.asList(three, four, one)));
87	assertEquals(5, full.size());
88	assertFalse(full.addAll(Arrays.asList(three, four, one)));
89	assertEquals(5, full.size());
90	}
91
92	/**
93	* add will not add the element if it already exists in the set
94	*/
95	public void testAdd2() {
96	Set full = populatedSet(3);
97	full.add(one);
98	assertEquals(3, full.size());
99	}
100
101	/**
102	* add adds the element when it does not exist in the set
103	*/
104	public void testAdd3() {
105	Set full = populatedSet(3);
106	full.add(three);
107	assertTrue(full.contains(three));
108	}
109
110	/**
111	* clear removes all elements from the set
112	*/
113	public void testClear() {
114	Collection full = populatedSet(3);
115	full.clear();
116	assertEquals(0, full.size());
117	assertTrue(full.isEmpty());
118	}
119
120	/**
121	* contains returns true for added elements
122	*/
123	public void testContains() {
124	Collection full = populatedSet(3);
125	assertTrue(full.contains(one));
126	assertFalse(full.contains(five));
127	}
128
129	/**
130	* Sets with equal elements are equal
131	*/
132	public void testEquals() {
133	CopyOnWriteArraySet a = populatedSet(3);
134	CopyOnWriteArraySet b = populatedSet(3);
135	assertTrue(a.equals(b));
136	assertTrue(b.equals(a));
137	assertTrue(a.containsAll(b));
138	assertTrue(b.containsAll(a));
139	assertEquals(a.hashCode(), b.hashCode());
140	assertEquals(a.size(), b.size());
141
142	a.add(m1);
143	assertFalse(a.equals(b));
144	assertFalse(b.equals(a));
145	assertTrue(a.containsAll(b));
146	assertFalse(b.containsAll(a));
147	b.add(m1);
148	assertTrue(a.equals(b));
149	assertTrue(b.equals(a));
150	assertTrue(a.containsAll(b));
151	assertTrue(b.containsAll(a));
152	assertEquals(a.hashCode(), b.hashCode());
153
154	Object x = a.iterator().next();
155	a.remove(x);
156	assertFalse(a.equals(b));
157	assertFalse(b.equals(a));
158	assertFalse(a.containsAll(b));
159	assertTrue(b.containsAll(a));
160	a.add(x);
161	assertTrue(a.equals(b));
162	assertTrue(b.equals(a));
163	assertTrue(a.containsAll(b));
164	assertTrue(b.containsAll(a));
165	assertEquals(a.hashCode(), b.hashCode());
166	assertEquals(a.size(), b.size());
167
168	CopyOnWriteArraySet empty1 = new CopyOnWriteArraySet(Arrays.asList());
169	CopyOnWriteArraySet empty2 = new CopyOnWriteArraySet(Arrays.asList());
170	assertTrue(empty1.equals(empty1));
171	assertTrue(empty1.equals(empty2));
172
173	assertFalse(empty1.equals(a));
174	assertFalse(a.equals(empty1));
175
176	assertFalse(a.equals(null));
177	}
178
179	/**
180	* containsAll returns true for collections with subset of elements
181	*/
182	public void testContainsAll() {
183	Collection full = populatedSet(3);
184	assertTrue(full.containsAll(full));
185	assertTrue(full.containsAll(Arrays.asList()));
186	assertTrue(full.containsAll(Arrays.asList(one)));
187	assertTrue(full.containsAll(Arrays.asList(one, two)));
188	assertFalse(full.containsAll(Arrays.asList(one, two, six)));
189	assertFalse(full.containsAll(Arrays.asList(six)));
190
191	CopyOnWriteArraySet empty1 = new CopyOnWriteArraySet(Arrays.asList());
192	CopyOnWriteArraySet empty2 = new CopyOnWriteArraySet(Arrays.asList());
193	assertTrue(empty1.containsAll(empty2));
194	assertTrue(empty1.containsAll(empty1));
195	assertFalse(empty1.containsAll(full));
196	assertTrue(full.containsAll(empty1));
197
198	try {
199	full.containsAll(null);
200	shouldThrow();
201	} catch (NullPointerException success) {}
202	}
203
204	/**
205	* isEmpty is true when empty, else false
206	*/
207	public void testIsEmpty() {
208	assertTrue(populatedSet(0).isEmpty());
209	assertFalse(populatedSet(3).isEmpty());
210	}
211
212	/**
213	* iterator() returns an iterator containing the elements of the
214	* set in insertion order
215	*/
216	public void testIterator() {
217	Collection empty = new CopyOnWriteArraySet();
218	assertFalse(empty.iterator().hasNext());
219	try {
220	empty.iterator().next();
221	shouldThrow();
222	} catch (NoSuchElementException success) {}
223
224	Integer[] elements = new Integer[SIZE];
225	for (int i = 0; i < SIZE; i++)
226	elements[i] = i;
227	shuffle(elements);
228	Collection<Integer> full = populatedSet(elements);
229
230	Iterator it = full.iterator();
231	for (int j = 0; j < SIZE; j++) {
232	assertTrue(it.hasNext());
233	assertEquals(elements[j], it.next());
234	}
235	assertIteratorExhausted(it);
236	}
237
238	/**
239	* iterator of empty collection has no elements
240	*/
241	public void testEmptyIterator() {
242	assertIteratorExhausted(new CopyOnWriteArraySet().iterator());
243	}
244
245	/**
246	* iterator remove is unsupported
247	*/
248	public void testIteratorRemove() {
249	Collection full = populatedSet(3);
250	Iterator it = full.iterator();
251	it.next();
252	try {
253	it.remove();
254	shouldThrow();
255	} catch (UnsupportedOperationException success) {}
256	}
257
258	/**
259	* toString holds toString of elements
260	*/
261	public void testToString() {
262	assertEquals("[]", new CopyOnWriteArraySet().toString());
263	Collection full = populatedSet(3);
264	String s = full.toString();
265	for (int i = 0; i < 3; ++i)
266	assertTrue(s.contains(String.valueOf(i)));
267	assertEquals(new ArrayList(full).toString(),
268	full.toString());
269	}
270
271	/**
272	* removeAll removes all elements from the given collection
273	*/
274	public void testRemoveAll() {
275	Set full = populatedSet(3);
276	assertTrue(full.removeAll(Arrays.asList(one, two)));
277	assertEquals(1, full.size());
278	assertFalse(full.removeAll(Arrays.asList(one, two)));
279	assertEquals(1, full.size());
280	}
281
282	/**
283	* remove removes an element
284	*/
285	public void testRemove() {
286	Collection full = populatedSet(3);
287	full.remove(one);
288	assertFalse(full.contains(one));
289	assertEquals(2, full.size());
290	}
291
292	/**
293	* size returns the number of elements
294	*/
295	public void testSize() {
296	Collection empty = new CopyOnWriteArraySet();
297	Collection full = populatedSet(3);
298	assertEquals(3, full.size());
299	assertEquals(0, empty.size());
300	}
301
302	/**
303	* toArray() returns an Object array containing all elements from
304	* the set in insertion order
305	*/
306	public void testToArray() {
307	Object[] a = new CopyOnWriteArraySet().toArray();
308	assertTrue(Arrays.equals(new Object[0], a));
309	assertSame(Object[].class, a.getClass());
310
311	Integer[] elements = new Integer[SIZE];
312	for (int i = 0; i < SIZE; i++)
313	elements[i] = i;
314	shuffle(elements);
315	Collection<Integer> full = populatedSet(elements);
316
317	assertTrue(Arrays.equals(elements, full.toArray()));
318	assertSame(Object[].class, full.toArray().getClass());
319	}
320
321	/**
322	* toArray(Integer array) returns an Integer array containing all
323	* elements from the set in insertion order
324	*/
325	public void testToArray2() {
326	Collection empty = new CopyOnWriteArraySet();
327	Integer[] a;
328
329	a = new Integer[0];
330	assertSame(a, empty.toArray(a));
331
332	a = new Integer[SIZE / 2];
333	Arrays.fill(a, 42);
334	assertSame(a, empty.toArray(a));
335	assertNull(a[0]);
336	for (int i = 1; i < a.length; i++)
337	assertEquals(42, (int) a[i]);
338
339	Integer[] elements = new Integer[SIZE];
340	for (int i = 0; i < SIZE; i++)
341	elements[i] = i;
342	shuffle(elements);
343	Collection<Integer> full = populatedSet(elements);
344
345	Arrays.fill(a, 42);
346	assertTrue(Arrays.equals(elements, full.toArray(a)));
347	for (int i = 0; i < a.length; i++)
348	assertEquals(42, (int) a[i]);
349	assertSame(Integer[].class, full.toArray(a).getClass());
350
351	a = new Integer[SIZE];
352	Arrays.fill(a, 42);
353	assertSame(a, full.toArray(a));
354	assertTrue(Arrays.equals(elements, a));
355
356	a = new Integer[2 * SIZE];
357	Arrays.fill(a, 42);
358	assertSame(a, full.toArray(a));
359	assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE)));
360	assertNull(a[SIZE]);
361	for (int i = SIZE + 1; i < a.length; i++)
362	assertEquals(42, (int) a[i]);
363	}
364
365	/**
366	* toArray throws an ArrayStoreException when the given array can
367	* not store the objects inside the set
368	*/
369	public void testToArray_ArrayStoreException() {
370	CopyOnWriteArraySet c = new CopyOnWriteArraySet();
371	c.add("zfasdfsdf");
372	c.add("asdadasd");
373	try {
374	c.toArray(new Long[5]);
375	shouldThrow();
376	} catch (ArrayStoreException success) {}
377	}
378
379	/**
380	* A deserialized serialized set is equal
381	*/
382	public void testSerialization() throws Exception {
383	Set x = populatedSet(SIZE);
384	Set y = serialClone(x);
385
386	assertNotSame(y, x);
387	assertEquals(x.size(), y.size());
388	assertEquals(x.toString(), y.toString());
389	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
390	assertEquals(x, y);
391	assertEquals(y, x);
392	}
393
394	/**
395	* addAll is idempotent
396	*/
397	public void testAddAll_idempotent() throws Exception {
398	Set x = populatedSet(SIZE);
399	Set y = new CopyOnWriteArraySet(x);
400	y.addAll(x);
401	assertEquals(x, y);
402	assertEquals(y, x);
403	}
404
405	}