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.Vector;
import java.util.concurrent.CopyOnWriteArraySet;

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

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());
        }
        assertIteratorExhausted(it);
    }

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

    /**
     * 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);

        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:	1.29
Committed:	Sat Jan 17 22:55:06 2015 UTC (9 years, 3 months ago) by jsr166
Branch:	MAIN
Changes since 1.28:	+8 -5 lines
Log Message:	add more tests of exhausted iterators
#	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.Vector;
17	import java.util.concurrent.CopyOnWriteArraySet;
18
19	import junit.framework.Test;
20	import junit.framework.TestSuite;
21
22	public class CopyOnWriteArraySetTest extends JSR166TestCase {
23	public static void main(String[] args) {
24	junit.textui.TestRunner.run(suite());
25	}
26	public static Test suite() {
27	return new TestSuite(CopyOnWriteArraySetTest.class);
28	}
29
30	static CopyOnWriteArraySet<Integer> populatedSet(int n) {
31	CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
32	assertTrue(a.isEmpty());
33	for (int i = 0; i < n; i++)
34	a.add(i);
35	assertFalse(a.isEmpty());
36	assertEquals(n, a.size());
37	return a;
38	}
39
40	static CopyOnWriteArraySet populatedSet(Integer[] elements) {
41	CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
42	assertTrue(a.isEmpty());
43	for (int i = 0; i < elements.length; i++)
44	a.add(elements[i]);
45	assertFalse(a.isEmpty());
46	assertEquals(elements.length, a.size());
47	return a;
48	}
49
50	/**
51	* Default-constructed set is empty
52	*/
53	public void testConstructor() {
54	CopyOnWriteArraySet a = new CopyOnWriteArraySet();
55	assertTrue(a.isEmpty());
56	}
57
58	/**
59	* Collection-constructed set holds all of its elements
60	*/
61	public void testConstructor3() {
62	Integer[] ints = new Integer[SIZE];
63	for (int i = 0; i < SIZE-1; ++i)
64	ints[i] = new Integer(i);
65	CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints));
66	for (int i = 0; i < SIZE; ++i)
67	assertTrue(a.contains(ints[i]));
68	}
69
70	/**
71	* addAll adds each element from the given collection
72	*/
73	public void testAddAll() {
74	CopyOnWriteArraySet full = populatedSet(3);
75	Vector v = new Vector();
76	v.add(three);
77	v.add(four);
78	v.add(five);
79	full.addAll(v);
80	assertEquals(6, full.size());
81	}
82
83	/**
84	* addAll adds each element from the given collection that did not
85	* already exist in the set
86	*/
87	public void testAddAll2() {
88	CopyOnWriteArraySet full = populatedSet(3);
89	Vector v = new Vector();
90	v.add(three);
91	v.add(four);
92	v.add(one); // will not add this element
93	full.addAll(v);
94	assertEquals(5, full.size());
95	}
96
97	/**
98	* add will not add the element if it already exists in the set
99	*/
100	public void testAdd2() {
101	CopyOnWriteArraySet full = populatedSet(3);
102	full.add(one);
103	assertEquals(3, full.size());
104	}
105
106	/**
107	* add adds the element when it does not exist in the set
108	*/
109	public void testAdd3() {
110	CopyOnWriteArraySet full = populatedSet(3);
111	full.add(three);
112	assertTrue(full.contains(three));
113	}
114
115	/**
116	* clear removes all elements from the set
117	*/
118	public void testClear() {
119	CopyOnWriteArraySet full = populatedSet(3);
120	full.clear();
121	assertEquals(0, full.size());
122	}
123
124	/**
125	* contains returns true for added elements
126	*/
127	public void testContains() {
128	CopyOnWriteArraySet full = populatedSet(3);
129	assertTrue(full.contains(one));
130	assertFalse(full.contains(five));
131	}
132
133	/**
134	* Sets with equal elements are equal
135	*/
136	public void testEquals() {
137	CopyOnWriteArraySet a = populatedSet(3);
138	CopyOnWriteArraySet b = populatedSet(3);
139	assertTrue(a.equals(b));
140	assertTrue(b.equals(a));
141	assertEquals(a.hashCode(), b.hashCode());
142	a.add(m1);
143	assertFalse(a.equals(b));
144	assertFalse(b.equals(a));
145	b.add(m1);
146	assertTrue(a.equals(b));
147	assertTrue(b.equals(a));
148	assertEquals(a.hashCode(), b.hashCode());
149	}
150
151	/**
152	* containsAll returns true for collections with subset of elements
153	*/
154	public void testContainsAll() {
155	CopyOnWriteArraySet full = populatedSet(3);
156	Vector v = new Vector();
157	v.add(one);
158	v.add(two);
159	assertTrue(full.containsAll(v));
160	v.add(six);
161	assertFalse(full.containsAll(v));
162	}
163
164	/**
165	* isEmpty is true when empty, else false
166	*/
167	public void testIsEmpty() {
168	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
169	CopyOnWriteArraySet full = populatedSet(3);
170	assertTrue(empty.isEmpty());
171	assertFalse(full.isEmpty());
172	}
173
174	/**
175	* iterator() returns an iterator containing the elements of the
176	* set in insertion order
177	*/
178	public void testIterator() {
179	Collection empty = new CopyOnWriteArraySet();
180	assertFalse(empty.iterator().hasNext());
181	try {
182	empty.iterator().next();
183	shouldThrow();
184	} catch (NoSuchElementException success) {}
185
186	Integer[] elements = new Integer[SIZE];
187	for (int i = 0; i < SIZE; i++)
188	elements[i] = i;
189	Collections.shuffle(Arrays.asList(elements));
190	Collection<Integer> full = populatedSet(elements);
191
192	Iterator it = full.iterator();
193	for (int j = 0; j < SIZE; j++) {
194	assertTrue(it.hasNext());
195	assertEquals(elements[j], it.next());
196	}
197	assertIteratorExhausted(it);
198	}
199
200	/**
201	* iterator of empty collection has no elements
202	*/
203	public void testEmptyIterator() {
204	assertIteratorExhausted(new CopyOnWriteArraySet().iterator());
205	}
206
207	/**
208	* iterator remove is unsupported
209	*/
210	public void testIteratorRemove() {
211	CopyOnWriteArraySet full = populatedSet(3);
212	Iterator it = full.iterator();
213	it.next();
214	try {
215	it.remove();
216	shouldThrow();
217	} catch (UnsupportedOperationException success) {}
218	}
219
220	/**
221	* toString holds toString of elements
222	*/
223	public void testToString() {
224	assertEquals("[]", new CopyOnWriteArraySet().toString());
225	CopyOnWriteArraySet full = populatedSet(3);
226	String s = full.toString();
227	for (int i = 0; i < 3; ++i)
228	assertTrue(s.contains(String.valueOf(i)));
229	assertEquals(new ArrayList(full).toString(),
230	full.toString());
231	}
232
233	/**
234	* removeAll removes all elements from the given collection
235	*/
236	public void testRemoveAll() {
237	CopyOnWriteArraySet full = populatedSet(3);
238	Vector v = new Vector();
239	v.add(one);
240	v.add(two);
241	full.removeAll(v);
242	assertEquals(1, full.size());
243	}
244
245	/**
246	* remove removes an element
247	*/
248	public void testRemove() {
249	CopyOnWriteArraySet full = populatedSet(3);
250	full.remove(one);
251	assertFalse(full.contains(one));
252	assertEquals(2, full.size());
253	}
254
255	/**
256	* size returns the number of elements
257	*/
258	public void testSize() {
259	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
260	CopyOnWriteArraySet full = populatedSet(3);
261	assertEquals(3, full.size());
262	assertEquals(0, empty.size());
263	}
264
265	/**
266	* toArray() returns an Object array containing all elements from
267	* the set in insertion order
268	*/
269	public void testToArray() {
270	Object[] a = new CopyOnWriteArraySet().toArray();
271	assertTrue(Arrays.equals(new Object[0], a));
272	assertSame(Object[].class, a.getClass());
273
274	Integer[] elements = new Integer[SIZE];
275	for (int i = 0; i < SIZE; i++)
276	elements[i] = i;
277	Collections.shuffle(Arrays.asList(elements));
278	Collection<Integer> full = populatedSet(elements);
279
280	assertTrue(Arrays.equals(elements, full.toArray()));
281	assertSame(Object[].class, full.toArray().getClass());
282	}
283
284	/**
285	* toArray(Integer array) returns an Integer array containing all
286	* elements from the set in insertion order
287	*/
288	public void testToArray2() {
289	Collection empty = new CopyOnWriteArraySet();
290	Integer[] a;
291
292	a = new Integer[0];
293	assertSame(a, empty.toArray(a));
294
295	a = new Integer[SIZE/2];
296	Arrays.fill(a, 42);
297	assertSame(a, empty.toArray(a));
298	assertNull(a[0]);
299	for (int i = 1; i < a.length; i++)
300	assertEquals(42, (int) a[i]);
301
302	Integer[] elements = new Integer[SIZE];
303	for (int i = 0; i < SIZE; i++)
304	elements[i] = i;
305	Collections.shuffle(Arrays.asList(elements));
306	Collection<Integer> full = populatedSet(elements);
307
308	Arrays.fill(a, 42);
309	assertTrue(Arrays.equals(elements, full.toArray(a)));
310	for (int i = 0; i < a.length; i++)
311	assertEquals(42, (int) a[i]);
312	assertSame(Integer[].class, full.toArray(a).getClass());
313
314	a = new Integer[SIZE];
315	Arrays.fill(a, 42);
316	assertSame(a, full.toArray(a));
317	assertTrue(Arrays.equals(elements, a));
318
319	a = new Integer[2*SIZE];
320	Arrays.fill(a, 42);
321	assertSame(a, full.toArray(a));
322	assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE)));
323	assertNull(a[SIZE]);
324	for (int i = SIZE + 1; i < a.length; i++)
325	assertEquals(42, (int) a[i]);
326	}
327
328	/**
329	* toArray throws an ArrayStoreException when the given array can
330	* not store the objects inside the set
331	*/
332	public void testToArray_ArrayStoreException() {
333	try {
334	CopyOnWriteArraySet c = new CopyOnWriteArraySet();
335	c.add("zfasdfsdf");
336	c.add("asdadasd");
337	c.toArray(new Long[5]);
338	shouldThrow();
339	} catch (ArrayStoreException success) {}
340	}
341
342	/**
343	* A deserialized serialized set is equal
344	*/
345	public void testSerialization() throws Exception {
346	Set x = populatedSet(SIZE);
347	Set y = serialClone(x);
348
349	assertNotSame(y, x);
350	assertEquals(x.size(), y.size());
351	assertEquals(x.toString(), y.toString());
352	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
353	assertEquals(x, y);
354	assertEquals(y, x);
355	}
356
357	/**
358	* addAll is idempotent
359	*/
360	public void testAddAll_idempotent() throws Exception {
361	Set x = populatedSet(SIZE);
362	Set y = new CopyOnWriteArraySet(x);
363	y.addAll(x);
364	assertEquals(x, y);
365	assertEquals(y, x);
366	}
367
368	}