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 junit.framework.*;
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.Vector;
import java.util.concurrent.CopyOnWriteArraySet;

public class CopyOnWriteArraySetTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    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);
        assertFalse(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 element from the given collection
     */
    public void testAddAll() {
        CopyOnWriteArraySet full = populatedSet(3);
        Vector v = new Vector();
        v.add(three);
        v.add(four);
        v.add(five);
        full.addAll(v);
        assertEquals(6, full.size());
    }

    /**
     * addAll adds each element from the given collection that did not
     * already exist in the set
     */
    public void testAddAll2() {
        CopyOnWriteArraySet full = populatedSet(3);
        Vector v = new Vector();
        v.add(three);
        v.add(four);
        v.add(one); // will not add this element
        full.addAll(v);
        assertEquals(5, full.size());
    }

    /**
     * add will not add the element if it already exists in the set
     */
    public void testAdd2() {
        CopyOnWriteArraySet 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() {
        CopyOnWriteArraySet full = populatedSet(3);
        full.add(three);
        assertTrue(full.contains(three));
    }

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

    /**
     * contains returns true for added elements
     */
    public void testContains() {
        CopyOnWriteArraySet 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));
        assertEquals(a.hashCode(), b.hashCode());
        a.add(m1);
        assertFalse(a.equals(b));
        assertFalse(b.equals(a));
        b.add(m1);
        assertTrue(a.equals(b));
        assertTrue(b.equals(a));
        assertEquals(a.hashCode(), b.hashCode());
    }

    /**
     * containsAll returns true for collections with subset of elements
     */
    public void testContainsAll() {
        CopyOnWriteArraySet full = populatedSet(3);
        Vector v = new Vector();
        v.add(one);
        v.add(two);
        assertTrue(full.containsAll(v));
        v.add(six);
        assertFalse(full.containsAll(v));
    }

    /**
     * isEmpty is true when empty, else false
     */
    public void testIsEmpty() {
        CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
        CopyOnWriteArraySet full = populatedSet(3);
        assertTrue(empty.isEmpty());
        assertFalse(full.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;
        Collections.shuffle(Arrays.asList(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());
        }
        assertFalse(it.hasNext());
        try {
            it.next();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * iterator remove is unsupported
     */
    public void testIteratorRemove() {
        CopyOnWriteArraySet 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());
        CopyOnWriteArraySet 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() {
        CopyOnWriteArraySet full = populatedSet(3);
        Vector v = new Vector();
        v.add(one);
        v.add(two);
        full.removeAll(v);
        assertEquals(1, full.size());
    }

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

    /**
     * size returns the number of elements
     */
    public void testSize() {
        CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
        CopyOnWriteArraySet 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;
        Collections.shuffle(Arrays.asList(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;
        Collections.shuffle(Arrays.asList(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() {
        try {
            CopyOnWriteArraySet c = new CopyOnWriteArraySet();
            c.add("zfasdfsdf");
            c.add("asdadasd");
            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);

        assertTrue(x != y);
        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:	1.26
Committed:	Tue Apr 2 22:18:26 2013 UTC (11 years, 1 month ago) by jsr166
Branch:	MAIN
Changes since 1.25:	+11 -0 lines
Log Message:	add new test testAllAll_idempotent
#	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			import junit.framework.*;
10	jsr166	1.25	import java.util.ArrayList;
11	jsr166	1.19	import java.util.Arrays;
12	jsr166	1.22	import java.util.Collection;
13	jsr166	1.21	import java.util.Collections;
14	jsr166	1.19	import java.util.Iterator;
15	jsr166	1.24	import java.util.NoSuchElementException;
16	jsr166	1.19	import java.util.Set;
17			import java.util.Vector;
18			import java.util.concurrent.CopyOnWriteArraySet;
19	dl	1.1
20	dl	1.3	public class CopyOnWriteArraySetTest extends JSR166TestCase {
21	dl	1.1	public static void main(String[] args) {
22	jsr166	1.15	junit.textui.TestRunner.run(suite());
23	dl	1.1	}
24			public static Test suite() {
25	jsr166	1.11	return new TestSuite(CopyOnWriteArraySetTest.class);
26	dl	1.1	}
27
28	jsr166	1.21	static CopyOnWriteArraySet<Integer> populatedSet(int n) {
29			CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
30	dl	1.1	assertTrue(a.isEmpty());
31	jsr166	1.22	for (int i = 0; i < n; i++)
32	jsr166	1.21	a.add(i);
33	dl	1.1	assertFalse(a.isEmpty());
34			assertEquals(n, a.size());
35			return a;
36			}
37
38	jsr166	1.21	static CopyOnWriteArraySet populatedSet(Integer[] elements) {
39			CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
40			assertTrue(a.isEmpty());
41			for (int i = 0; i < elements.length; i++)
42			a.add(elements[i]);
43			assertFalse(a.isEmpty());
44			assertEquals(elements.length, a.size());
45			return a;
46			}
47
48	dl	1.4	/**
49			* Default-constructed set is empty
50			*/
51	dl	1.3	public void testConstructor() {
52	jsr166	1.11	CopyOnWriteArraySet a = new CopyOnWriteArraySet();
53	dl	1.3	assertTrue(a.isEmpty());
54			}
55
56	dl	1.4	/**
57	dl	1.5	* Collection-constructed set holds all of its elements
58	dl	1.4	*/
59	dl	1.3	public void testConstructor3() {
60			Integer[] ints = new Integer[SIZE];
61			for (int i = 0; i < SIZE-1; ++i)
62			ints[i] = new Integer(i);
63	jsr166	1.11	CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints));
64	jsr166	1.8	for (int i = 0; i < SIZE; ++i)
65	dl	1.3	assertTrue(a.contains(ints[i]));
66			}
67	jsr166	1.8
68	dl	1.1	/**
69	jsr166	1.16	* addAll adds each element from the given collection
70	dl	1.1	*/
71	dl	1.4	public void testAddAll() {
72	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
73			Vector v = new Vector();
74			v.add(three);
75			v.add(four);
76			v.add(five);
77			full.addAll(v);
78			assertEquals(6, full.size());
79	dl	1.1	}
80
81			/**
82	jsr166	1.16	* addAll adds each element from the given collection that did not
83			* already exist in the set
84	dl	1.1	*/
85	dl	1.4	public void testAddAll2() {
86	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
87			Vector v = new Vector();
88			v.add(three);
89			v.add(four);
90			v.add(one); // will not add this element
91			full.addAll(v);
92			assertEquals(5, full.size());
93	dl	1.1	}
94
95			/**
96	jsr166	1.16	* add will not add the element if it already exists in the set
97	dl	1.1	*/
98	dl	1.4	public void testAdd2() {
99	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
100			full.add(one);
101			assertEquals(3, full.size());
102	dl	1.1	}
103
104			/**
105	jsr166	1.16	* add adds the element when it does not exist in the set
106	dl	1.1	*/
107	dl	1.4	public void testAdd3() {
108	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
109	dl	1.3	full.add(three);
110			assertTrue(full.contains(three));
111	dl	1.1	}
112
113			/**
114	jsr166	1.16	* clear removes all elements from the set
115	dl	1.1	*/
116	dl	1.4	public void testClear() {
117	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
118			full.clear();
119			assertEquals(0, full.size());
120	dl	1.1	}
121
122			/**
123	jsr166	1.16	* contains returns true for added elements
124	dl	1.1	*/
125	dl	1.4	public void testContains() {
126	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
127			assertTrue(full.contains(one));
128			assertFalse(full.contains(five));
129	dl	1.1	}
130
131	dl	1.4	/**
132			* Sets with equal elements are equal
133			*/
134	dl	1.1	public void testEquals() {
135	jsr166	1.11	CopyOnWriteArraySet a = populatedSet(3);
136			CopyOnWriteArraySet b = populatedSet(3);
137	dl	1.1	assertTrue(a.equals(b));
138			assertTrue(b.equals(a));
139			assertEquals(a.hashCode(), b.hashCode());
140	dl	1.3	a.add(m1);
141	dl	1.1	assertFalse(a.equals(b));
142			assertFalse(b.equals(a));
143	dl	1.3	b.add(m1);
144	dl	1.1	assertTrue(a.equals(b));
145			assertTrue(b.equals(a));
146			assertEquals(a.hashCode(), b.hashCode());
147			}
148
149			/**
150	jsr166	1.16	* containsAll returns true for collections with subset of elements
151	dl	1.1	*/
152	dl	1.4	public void testContainsAll() {
153	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
154			Vector v = new Vector();
155			v.add(one);
156			v.add(two);
157			assertTrue(full.containsAll(v));
158			v.add(six);
159			assertFalse(full.containsAll(v));
160	dl	1.1	}
161
162			/**
163	jsr166	1.16	* isEmpty is true when empty, else false
164	dl	1.1	*/
165	dl	1.4	public void testIsEmpty() {
166	jsr166	1.11	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
167			CopyOnWriteArraySet full = populatedSet(3);
168			assertTrue(empty.isEmpty());
169			assertFalse(full.isEmpty());
170	dl	1.1	}
171
172			/**
173	jsr166	1.24	* iterator() returns an iterator containing the elements of the
174			* set in insertion order
175	dl	1.1	*/
176	dl	1.4	public void testIterator() {
177	jsr166	1.25	Collection empty = new CopyOnWriteArraySet();
178	jsr166	1.24	assertFalse(empty.iterator().hasNext());
179			try {
180			empty.iterator().next();
181			shouldThrow();
182			} catch (NoSuchElementException success) {}
183
184			Integer[] elements = new Integer[SIZE];
185			for (int i = 0; i < SIZE; i++)
186			elements[i] = i;
187			Collections.shuffle(Arrays.asList(elements));
188			Collection<Integer> full = populatedSet(elements);
189
190			Iterator it = full.iterator();
191			for (int j = 0; j < SIZE; j++) {
192			assertTrue(it.hasNext());
193			assertEquals(elements[j], it.next());
194			}
195			assertFalse(it.hasNext());
196			try {
197			it.next();
198			shouldThrow();
199			} catch (NoSuchElementException success) {}
200	dl	1.1	}
201
202	dl	1.4	/**
203			* iterator remove is unsupported
204			*/
205	jsr166	1.15	public void testIteratorRemove() {
206	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
207	dl	1.1	Iterator it = full.iterator();
208			it.next();
209			try {
210			it.remove();
211	dl	1.4	shouldThrow();
212	jsr166	1.12	} catch (UnsupportedOperationException success) {}
213	dl	1.1	}
214
215	dl	1.4	/**
216			* toString holds toString of elements
217			*/
218			public void testToString() {
219	jsr166	1.25	assertEquals("[]", new CopyOnWriteArraySet().toString());
220	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
221	dl	1.1	String s = full.toString();
222	jsr166	1.25	for (int i = 0; i < 3; ++i)
223	jsr166	1.18	assertTrue(s.contains(String.valueOf(i)));
224	jsr166	1.25	assertEquals(new ArrayList(full).toString(),
225			full.toString());
226	jsr166	1.8	}
227	dl	1.1
228			/**
229	jsr166	1.16	* removeAll removes all elements from the given collection
230	dl	1.1	*/
231	dl	1.4	public void testRemoveAll() {
232	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
233			Vector v = new Vector();
234			v.add(one);
235			v.add(two);
236			full.removeAll(v);
237			assertEquals(1, full.size());
238	dl	1.1	}
239
240	dl	1.4	/**
241			* remove removes an element
242			*/
243			public void testRemove() {
244	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
245			full.remove(one);
246	dl	1.3	assertFalse(full.contains(one));
247	jsr166	1.11	assertEquals(2, full.size());
248	dl	1.1	}
249
250			/**
251	jsr166	1.16	* size returns the number of elements
252	dl	1.1	*/
253	dl	1.4	public void testSize() {
254	jsr166	1.11	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
255			CopyOnWriteArraySet full = populatedSet(3);
256			assertEquals(3, full.size());
257			assertEquals(0, empty.size());
258	dl	1.1	}
259
260			/**
261	jsr166	1.21	* toArray() returns an Object array containing all elements from
262			* the set in insertion order
263	dl	1.1	*/
264	dl	1.4	public void testToArray() {
265	jsr166	1.21	Object[] a = new CopyOnWriteArraySet().toArray();
266			assertTrue(Arrays.equals(new Object[0], a));
267			assertSame(Object[].class, a.getClass());
268
269			Integer[] elements = new Integer[SIZE];
270	jsr166	1.20	for (int i = 0; i < SIZE; i++)
271	jsr166	1.21	elements[i] = i;
272			Collections.shuffle(Arrays.asList(elements));
273	jsr166	1.22	Collection<Integer> full = populatedSet(elements);
274	jsr166	1.21
275			assertTrue(Arrays.equals(elements, full.toArray()));
276			assertSame(Object[].class, full.toArray().getClass());
277	dl	1.1	}
278
279			/**
280	jsr166	1.21	* toArray(Integer array) returns an Integer array containing all
281			* elements from the set in insertion order
282	dl	1.1	*/
283	dl	1.4	public void testToArray2() {
284	jsr166	1.22	Collection empty = new CopyOnWriteArraySet();
285	jsr166	1.21	Integer[] a;
286
287			a = new Integer[0];
288			assertSame(a, empty.toArray(a));
289
290			a = new Integer[SIZE/2];
291			Arrays.fill(a, 42);
292			assertSame(a, empty.toArray(a));
293			assertNull(a[0]);
294			for (int i = 1; i < a.length; i++)
295			assertEquals(42, (int) a[i]);
296
297			Integer[] elements = new Integer[SIZE];
298	jsr166	1.20	for (int i = 0; i < SIZE; i++)
299	jsr166	1.21	elements[i] = i;
300			Collections.shuffle(Arrays.asList(elements));
301	jsr166	1.22	Collection<Integer> full = populatedSet(elements);
302	jsr166	1.21
303			Arrays.fill(a, 42);
304			assertTrue(Arrays.equals(elements, full.toArray(a)));
305			for (int i = 0; i < a.length; i++)
306			assertEquals(42, (int) a[i]);
307			assertSame(Integer[].class, full.toArray(a).getClass());
308
309			a = new Integer[SIZE];
310			Arrays.fill(a, 42);
311			assertSame(a, full.toArray(a));
312			assertTrue(Arrays.equals(elements, a));
313
314			a = new Integer[2*SIZE];
315			Arrays.fill(a, 42);
316			assertSame(a, full.toArray(a));
317			assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE)));
318			assertNull(a[SIZE]);
319			for (int i = SIZE + 1; i < a.length; i++)
320			assertEquals(42, (int) a[i]);
321	dl	1.1	}
322
323			/**
324	jsr166	1.16	* toArray throws an ArrayStoreException when the given array can
325			* not store the objects inside the set
326	dl	1.1	*/
327	dl	1.4	public void testToArray_ArrayStoreException() {
328			try {
329	dl	1.1	CopyOnWriteArraySet c = new CopyOnWriteArraySet();
330			c.add("zfasdfsdf");
331			c.add("asdadasd");
332			c.toArray(new Long[5]);
333	jsr166	1.11	shouldThrow();
334	jsr166	1.13	} catch (ArrayStoreException success) {}
335	dl	1.2	}
336
337	dl	1.4	/**
338	dl	1.7	* A deserialized serialized set is equal
339	dl	1.4	*/
340	jsr166	1.12	public void testSerialization() throws Exception {
341	jsr166	1.19	Set x = populatedSet(SIZE);
342			Set y = serialClone(x);
343	dl	1.2
344	jsr166	1.19	assertTrue(x != y);
345			assertEquals(x.size(), y.size());
346	jsr166	1.23	assertEquals(x.toString(), y.toString());
347			assertTrue(Arrays.equals(x.toArray(), y.toArray()));
348	jsr166	1.19	assertEquals(x, y);
349			assertEquals(y, x);
350	dl	1.1	}
351
352	jsr166	1.26	/**
353			* addAll is idempotent
354			*/
355			public void testAddAll_idempotent() throws Exception {
356			Set x = populatedSet(SIZE);
357			Set y = new CopyOnWriteArraySet(x);
358			y.addAll(x);
359			assertEquals(x, y);
360			assertEquals(y, x);
361			}
362
363	dl	1.1	}