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());
        }
        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);

        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:	1.28
Committed:	Wed Dec 31 19:05:42 2014 UTC (9 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.27:	+3 -1 lines
Log Message:	no wildcard imports
#	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	assertFalse(it.hasNext());
198	try {
199	it.next();
200	shouldThrow();
201	} catch (NoSuchElementException success) {}
202	}
203
204	/**
205	* iterator remove is unsupported
206	*/
207	public void testIteratorRemove() {
208	CopyOnWriteArraySet full = populatedSet(3);
209	Iterator it = full.iterator();
210	it.next();
211	try {
212	it.remove();
213	shouldThrow();
214	} catch (UnsupportedOperationException success) {}
215	}
216
217	/**
218	* toString holds toString of elements
219	*/
220	public void testToString() {
221	assertEquals("[]", new CopyOnWriteArraySet().toString());
222	CopyOnWriteArraySet full = populatedSet(3);
223	String s = full.toString();
224	for (int i = 0; i < 3; ++i)
225	assertTrue(s.contains(String.valueOf(i)));
226	assertEquals(new ArrayList(full).toString(),
227	full.toString());
228	}
229
230	/**
231	* removeAll removes all elements from the given collection
232	*/
233	public void testRemoveAll() {
234	CopyOnWriteArraySet full = populatedSet(3);
235	Vector v = new Vector();
236	v.add(one);
237	v.add(two);
238	full.removeAll(v);
239	assertEquals(1, full.size());
240	}
241
242	/**
243	* remove removes an element
244	*/
245	public void testRemove() {
246	CopyOnWriteArraySet full = populatedSet(3);
247	full.remove(one);
248	assertFalse(full.contains(one));
249	assertEquals(2, full.size());
250	}
251
252	/**
253	* size returns the number of elements
254	*/
255	public void testSize() {
256	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
257	CopyOnWriteArraySet full = populatedSet(3);
258	assertEquals(3, full.size());
259	assertEquals(0, empty.size());
260	}
261
262	/**
263	* toArray() returns an Object array containing all elements from
264	* the set in insertion order
265	*/
266	public void testToArray() {
267	Object[] a = new CopyOnWriteArraySet().toArray();
268	assertTrue(Arrays.equals(new Object[0], a));
269	assertSame(Object[].class, a.getClass());
270
271	Integer[] elements = new Integer[SIZE];
272	for (int i = 0; i < SIZE; i++)
273	elements[i] = i;
274	Collections.shuffle(Arrays.asList(elements));
275	Collection<Integer> full = populatedSet(elements);
276
277	assertTrue(Arrays.equals(elements, full.toArray()));
278	assertSame(Object[].class, full.toArray().getClass());
279	}
280
281	/**
282	* toArray(Integer array) returns an Integer array containing all
283	* elements from the set in insertion order
284	*/
285	public void testToArray2() {
286	Collection empty = new CopyOnWriteArraySet();
287	Integer[] a;
288
289	a = new Integer[0];
290	assertSame(a, empty.toArray(a));
291
292	a = new Integer[SIZE/2];
293	Arrays.fill(a, 42);
294	assertSame(a, empty.toArray(a));
295	assertNull(a[0]);
296	for (int i = 1; i < a.length; i++)
297	assertEquals(42, (int) a[i]);
298
299	Integer[] elements = new Integer[SIZE];
300	for (int i = 0; i < SIZE; i++)
301	elements[i] = i;
302	Collections.shuffle(Arrays.asList(elements));
303	Collection<Integer> full = populatedSet(elements);
304
305	Arrays.fill(a, 42);
306	assertTrue(Arrays.equals(elements, full.toArray(a)));
307	for (int i = 0; i < a.length; i++)
308	assertEquals(42, (int) a[i]);
309	assertSame(Integer[].class, full.toArray(a).getClass());
310
311	a = new Integer[SIZE];
312	Arrays.fill(a, 42);
313	assertSame(a, full.toArray(a));
314	assertTrue(Arrays.equals(elements, a));
315
316	a = new Integer[2*SIZE];
317	Arrays.fill(a, 42);
318	assertSame(a, full.toArray(a));
319	assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE)));
320	assertNull(a[SIZE]);
321	for (int i = SIZE + 1; i < a.length; i++)
322	assertEquals(42, (int) a[i]);
323	}
324
325	/**
326	* toArray throws an ArrayStoreException when the given array can
327	* not store the objects inside the set
328	*/
329	public void testToArray_ArrayStoreException() {
330	try {
331	CopyOnWriteArraySet c = new CopyOnWriteArraySet();
332	c.add("zfasdfsdf");
333	c.add("asdadasd");
334	c.toArray(new Long[5]);
335	shouldThrow();
336	} catch (ArrayStoreException success) {}
337	}
338
339	/**
340	* A deserialized serialized set is equal
341	*/
342	public void testSerialization() throws Exception {
343	Set x = populatedSet(SIZE);
344	Set y = serialClone(x);
345
346	assertNotSame(y, x);
347	assertEquals(x.size(), y.size());
348	assertEquals(x.toString(), y.toString());
349	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
350	assertEquals(x, y);
351	assertEquals(y, x);
352	}
353
354	/**
355	* addAll is idempotent
356	*/
357	public void testAddAll_idempotent() throws Exception {
358	Set x = populatedSet(SIZE);
359	Set y = new CopyOnWriteArraySet(x);
360	y.addAll(x);
361	assertEquals(x, y);
362	assertEquals(y, x);
363	}
364
365	}