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
#	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	1.21	import java.util.Collections;
13	jsr166	1.19	import java.util.Iterator;
14	jsr166	1.24	import java.util.NoSuchElementException;
15	jsr166	1.19	import java.util.Set;
16			import java.util.concurrent.CopyOnWriteArraySet;
17	dl	1.1
18	jsr166	1.28	import junit.framework.Test;
19			import junit.framework.TestSuite;
20
21	dl	1.3	public class CopyOnWriteArraySetTest extends JSR166TestCase {
22	dl	1.1	public static void main(String[] args) {
23	jsr166	1.32	main(suite(), args);
24	dl	1.1	}
25			public static Test suite() {
26	jsr166	1.11	return new TestSuite(CopyOnWriteArraySetTest.class);
27	dl	1.1	}
28
29	jsr166	1.21	static CopyOnWriteArraySet<Integer> populatedSet(int n) {
30			CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
31	dl	1.1	assertTrue(a.isEmpty());
32	jsr166	1.22	for (int i = 0; i < n; i++)
33	jsr166	1.21	a.add(i);
34	jsr166	1.31	assertEquals(n == 0, a.isEmpty());
35	dl	1.1	assertEquals(n, a.size());
36			return a;
37			}
38
39	jsr166	1.21	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	dl	1.4	/**
50			* Default-constructed set is empty
51			*/
52	dl	1.3	public void testConstructor() {
53	jsr166	1.11	CopyOnWriteArraySet a = new CopyOnWriteArraySet();
54	dl	1.3	assertTrue(a.isEmpty());
55			}
56
57	dl	1.4	/**
58	dl	1.5	* Collection-constructed set holds all of its elements
59	dl	1.4	*/
60	dl	1.3	public void testConstructor3() {
61			Integer[] ints = new Integer[SIZE];
62	jsr166	1.34	for (int i = 0; i < SIZE - 1; ++i)
63	dl	1.3	ints[i] = new Integer(i);
64	jsr166	1.11	CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints));
65	jsr166	1.8	for (int i = 0; i < SIZE; ++i)
66	dl	1.3	assertTrue(a.contains(ints[i]));
67			}
68	jsr166	1.8
69	dl	1.1	/**
70	jsr166	1.31	* addAll adds each non-duplicate element from the given collection
71	dl	1.1	*/
72	dl	1.4	public void testAddAll() {
73	jsr166	1.31	Set full = populatedSet(3);
74	jsr166	1.30	assertTrue(full.addAll(Arrays.asList(three, four, five)));
75			assertEquals(6, full.size());
76			assertFalse(full.addAll(Arrays.asList(three, four, five)));
77	jsr166	1.11	assertEquals(6, full.size());
78	dl	1.1	}
79
80			/**
81	jsr166	1.31	* addAll adds each non-duplicate element from the given collection
82	dl	1.1	*/
83	dl	1.4	public void testAddAll2() {
84	jsr166	1.31	Set full = populatedSet(3);
85	jsr166	1.30	// "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	jsr166	1.11	assertEquals(5, full.size());
90	dl	1.1	}
91
92			/**
93	jsr166	1.16	* add will not add the element if it already exists in the set
94	dl	1.1	*/
95	dl	1.4	public void testAdd2() {
96	jsr166	1.31	Set full = populatedSet(3);
97	jsr166	1.11	full.add(one);
98			assertEquals(3, full.size());
99	dl	1.1	}
100
101			/**
102	jsr166	1.16	* add adds the element when it does not exist in the set
103	dl	1.1	*/
104	dl	1.4	public void testAdd3() {
105	jsr166	1.31	Set full = populatedSet(3);
106	dl	1.3	full.add(three);
107			assertTrue(full.contains(three));
108	dl	1.1	}
109
110			/**
111	jsr166	1.16	* clear removes all elements from the set
112	dl	1.1	*/
113	dl	1.4	public void testClear() {
114	jsr166	1.31	Collection full = populatedSet(3);
115	jsr166	1.11	full.clear();
116			assertEquals(0, full.size());
117	jsr166	1.31	assertTrue(full.isEmpty());
118	dl	1.1	}
119
120			/**
121	jsr166	1.16	* contains returns true for added elements
122	dl	1.1	*/
123	dl	1.4	public void testContains() {
124	jsr166	1.31	Collection full = populatedSet(3);
125	jsr166	1.11	assertTrue(full.contains(one));
126			assertFalse(full.contains(five));
127	dl	1.1	}
128
129	dl	1.4	/**
130			* Sets with equal elements are equal
131			*/
132	dl	1.1	public void testEquals() {
133	jsr166	1.11	CopyOnWriteArraySet a = populatedSet(3);
134			CopyOnWriteArraySet b = populatedSet(3);
135	dl	1.1	assertTrue(a.equals(b));
136			assertTrue(b.equals(a));
137	jsr166	1.35	assertTrue(a.containsAll(b));
138			assertTrue(b.containsAll(a));
139	dl	1.1	assertEquals(a.hashCode(), b.hashCode());
140	jsr166	1.35	assertEquals(a.size(), b.size());
141
142	dl	1.3	a.add(m1);
143	dl	1.1	assertFalse(a.equals(b));
144			assertFalse(b.equals(a));
145	jsr166	1.35	assertTrue(a.containsAll(b));
146			assertFalse(b.containsAll(a));
147	dl	1.3	b.add(m1);
148	dl	1.1	assertTrue(a.equals(b));
149			assertTrue(b.equals(a));
150	jsr166	1.35	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	dl	1.1	assertEquals(a.hashCode(), b.hashCode());
166	jsr166	1.35	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	dl	1.1	}
178
179			/**
180	jsr166	1.16	* containsAll returns true for collections with subset of elements
181	dl	1.1	*/
182	dl	1.4	public void testContainsAll() {
183	jsr166	1.31	Collection full = populatedSet(3);
184	jsr166	1.35	assertTrue(full.containsAll(full));
185	jsr166	1.30	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	jsr166	1.35
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	dl	1.1	}
203
204			/**
205	jsr166	1.16	* isEmpty is true when empty, else false
206	dl	1.1	*/
207	dl	1.4	public void testIsEmpty() {
208	jsr166	1.31	assertTrue(populatedSet(0).isEmpty());
209			assertFalse(populatedSet(3).isEmpty());
210	dl	1.1	}
211
212			/**
213	jsr166	1.24	* iterator() returns an iterator containing the elements of the
214			* set in insertion order
215	dl	1.1	*/
216	dl	1.4	public void testIterator() {
217	jsr166	1.25	Collection empty = new CopyOnWriteArraySet();
218	jsr166	1.24	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	jsr166	1.36	shuffle(elements);
228	jsr166	1.24	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	jsr166	1.29	assertIteratorExhausted(it);
236			}
237
238			/**
239			* iterator of empty collection has no elements
240			*/
241			public void testEmptyIterator() {
242			assertIteratorExhausted(new CopyOnWriteArraySet().iterator());
243	dl	1.1	}
244
245	dl	1.4	/**
246			* iterator remove is unsupported
247			*/
248	jsr166	1.15	public void testIteratorRemove() {
249	jsr166	1.31	Collection full = populatedSet(3);
250	dl	1.1	Iterator it = full.iterator();
251			it.next();
252			try {
253			it.remove();
254	dl	1.4	shouldThrow();
255	jsr166	1.12	} catch (UnsupportedOperationException success) {}
256	dl	1.1	}
257
258	dl	1.4	/**
259			* toString holds toString of elements
260			*/
261			public void testToString() {
262	jsr166	1.25	assertEquals("[]", new CopyOnWriteArraySet().toString());
263	jsr166	1.31	Collection full = populatedSet(3);
264	dl	1.1	String s = full.toString();
265	jsr166	1.25	for (int i = 0; i < 3; ++i)
266	jsr166	1.18	assertTrue(s.contains(String.valueOf(i)));
267	jsr166	1.25	assertEquals(new ArrayList(full).toString(),
268			full.toString());
269	jsr166	1.8	}
270	dl	1.1
271			/**
272	jsr166	1.16	* removeAll removes all elements from the given collection
273	dl	1.1	*/
274	dl	1.4	public void testRemoveAll() {
275	jsr166	1.31	Set full = populatedSet(3);
276	jsr166	1.30	assertTrue(full.removeAll(Arrays.asList(one, two)));
277			assertEquals(1, full.size());
278			assertFalse(full.removeAll(Arrays.asList(one, two)));
279	jsr166	1.11	assertEquals(1, full.size());
280	dl	1.1	}
281
282	dl	1.4	/**
283			* remove removes an element
284			*/
285			public void testRemove() {
286	jsr166	1.31	Collection full = populatedSet(3);
287	jsr166	1.11	full.remove(one);
288	dl	1.3	assertFalse(full.contains(one));
289	jsr166	1.11	assertEquals(2, full.size());
290	dl	1.1	}
291
292			/**
293	jsr166	1.16	* size returns the number of elements
294	dl	1.1	*/
295	dl	1.4	public void testSize() {
296	jsr166	1.31	Collection empty = new CopyOnWriteArraySet();
297			Collection full = populatedSet(3);
298	jsr166	1.11	assertEquals(3, full.size());
299			assertEquals(0, empty.size());
300	dl	1.1	}
301
302			/**
303	jsr166	1.21	* toArray() returns an Object array containing all elements from
304			* the set in insertion order
305	dl	1.1	*/
306	dl	1.4	public void testToArray() {
307	jsr166	1.21	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	jsr166	1.20	for (int i = 0; i < SIZE; i++)
313	jsr166	1.21	elements[i] = i;
314	jsr166	1.36	shuffle(elements);
315	jsr166	1.22	Collection<Integer> full = populatedSet(elements);
316	jsr166	1.21
317			assertTrue(Arrays.equals(elements, full.toArray()));
318			assertSame(Object[].class, full.toArray().getClass());
319	dl	1.1	}
320
321			/**
322	jsr166	1.21	* toArray(Integer array) returns an Integer array containing all
323			* elements from the set in insertion order
324	dl	1.1	*/
325	dl	1.4	public void testToArray2() {
326	jsr166	1.22	Collection empty = new CopyOnWriteArraySet();
327	jsr166	1.21	Integer[] a;
328
329			a = new Integer[0];
330			assertSame(a, empty.toArray(a));
331
332	jsr166	1.34	a = new Integer[SIZE / 2];
333	jsr166	1.21	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	jsr166	1.20	for (int i = 0; i < SIZE; i++)
341	jsr166	1.21	elements[i] = i;
342	jsr166	1.36	shuffle(elements);
343	jsr166	1.22	Collection<Integer> full = populatedSet(elements);
344	jsr166	1.21
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	jsr166	1.34	a = new Integer[2 * SIZE];
357	jsr166	1.21	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	dl	1.1	}
364
365			/**
366	jsr166	1.16	* toArray throws an ArrayStoreException when the given array can
367			* not store the objects inside the set
368	dl	1.1	*/
369	dl	1.4	public void testToArray_ArrayStoreException() {
370	jsr166	1.33	CopyOnWriteArraySet c = new CopyOnWriteArraySet();
371			c.add("zfasdfsdf");
372			c.add("asdadasd");
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	dl	1.7	* A deserialized serialized set is equal
381	dl	1.4	*/
382	jsr166	1.12	public void testSerialization() throws Exception {
383	jsr166	1.19	Set x = populatedSet(SIZE);
384			Set y = serialClone(x);
385	dl	1.2
386	jsr166	1.27	assertNotSame(y, x);
387	jsr166	1.19	assertEquals(x.size(), y.size());
388	jsr166	1.23	assertEquals(x.toString(), y.toString());
389			assertTrue(Arrays.equals(x.toArray(), y.toArray()));
390	jsr166	1.19	assertEquals(x, y);
391			assertEquals(y, x);
392	dl	1.1	}
393
394	jsr166	1.26	/**
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	dl	1.1	}