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) {
        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);
        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 element from the given collection that did not
     * already exist in the set
     */
    public void testAddAll2() {
        CopyOnWriteArraySet 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() {
        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);
        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)));
    }

    /**
     * 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);
        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() {
        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:	1.30
Committed:	Fri Feb 27 19:28:23 2015 UTC (9 years, 2 months ago) by jsr166
Branch:	MAIN
Changes since 1.29:	+15 -21 lines
Log Message:	replace Vector with Arrays.asList; add more assertions
#	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	junit.textui.TestRunner.run(suite());
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	assertFalse(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 element from the given collection
71	*/
72	public void testAddAll() {
73	CopyOnWriteArraySet 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 element from the given collection that did not
82	* already exist in the set
83	*/
84	public void testAddAll2() {
85	CopyOnWriteArraySet full = populatedSet(3);
86	// "one" is duplicate and will not be added
87	assertTrue(full.addAll(Arrays.asList(three, four, one)));
88	assertEquals(5, full.size());
89	assertFalse(full.addAll(Arrays.asList(three, four, one)));
90	assertEquals(5, full.size());
91	}
92
93	/**
94	* add will not add the element if it already exists in the set
95	*/
96	public void testAdd2() {
97	CopyOnWriteArraySet full = populatedSet(3);
98	full.add(one);
99	assertEquals(3, full.size());
100	}
101
102	/**
103	* add adds the element when it does not exist in the set
104	*/
105	public void testAdd3() {
106	CopyOnWriteArraySet full = populatedSet(3);
107	full.add(three);
108	assertTrue(full.contains(three));
109	}
110
111	/**
112	* clear removes all elements from the set
113	*/
114	public void testClear() {
115	CopyOnWriteArraySet full = populatedSet(3);
116	full.clear();
117	assertEquals(0, full.size());
118	}
119
120	/**
121	* contains returns true for added elements
122	*/
123	public void testContains() {
124	CopyOnWriteArraySet 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	assertEquals(a.hashCode(), b.hashCode());
138	a.add(m1);
139	assertFalse(a.equals(b));
140	assertFalse(b.equals(a));
141	b.add(m1);
142	assertTrue(a.equals(b));
143	assertTrue(b.equals(a));
144	assertEquals(a.hashCode(), b.hashCode());
145	}
146
147	/**
148	* containsAll returns true for collections with subset of elements
149	*/
150	public void testContainsAll() {
151	CopyOnWriteArraySet full = populatedSet(3);
152	assertTrue(full.containsAll(Arrays.asList()));
153	assertTrue(full.containsAll(Arrays.asList(one)));
154	assertTrue(full.containsAll(Arrays.asList(one, two)));
155	assertFalse(full.containsAll(Arrays.asList(one, two, six)));
156	assertFalse(full.containsAll(Arrays.asList(six)));
157	}
158
159	/**
160	* isEmpty is true when empty, else false
161	*/
162	public void testIsEmpty() {
163	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
164	CopyOnWriteArraySet full = populatedSet(3);
165	assertTrue(empty.isEmpty());
166	assertFalse(full.isEmpty());
167	}
168
169	/**
170	* iterator() returns an iterator containing the elements of the
171	* set in insertion order
172	*/
173	public void testIterator() {
174	Collection empty = new CopyOnWriteArraySet();
175	assertFalse(empty.iterator().hasNext());
176	try {
177	empty.iterator().next();
178	shouldThrow();
179	} catch (NoSuchElementException success) {}
180
181	Integer[] elements = new Integer[SIZE];
182	for (int i = 0; i < SIZE; i++)
183	elements[i] = i;
184	Collections.shuffle(Arrays.asList(elements));
185	Collection<Integer> full = populatedSet(elements);
186
187	Iterator it = full.iterator();
188	for (int j = 0; j < SIZE; j++) {
189	assertTrue(it.hasNext());
190	assertEquals(elements[j], it.next());
191	}
192	assertIteratorExhausted(it);
193	}
194
195	/**
196	* iterator of empty collection has no elements
197	*/
198	public void testEmptyIterator() {
199	assertIteratorExhausted(new CopyOnWriteArraySet().iterator());
200	}
201
202	/**
203	* iterator remove is unsupported
204	*/
205	public void testIteratorRemove() {
206	CopyOnWriteArraySet full = populatedSet(3);
207	Iterator it = full.iterator();
208	it.next();
209	try {
210	it.remove();
211	shouldThrow();
212	} catch (UnsupportedOperationException success) {}
213	}
214
215	/**
216	* toString holds toString of elements
217	*/
218	public void testToString() {
219	assertEquals("[]", new CopyOnWriteArraySet().toString());
220	CopyOnWriteArraySet full = populatedSet(3);
221	String s = full.toString();
222	for (int i = 0; i < 3; ++i)
223	assertTrue(s.contains(String.valueOf(i)));
224	assertEquals(new ArrayList(full).toString(),
225	full.toString());
226	}
227
228	/**
229	* removeAll removes all elements from the given collection
230	*/
231	public void testRemoveAll() {
232	CopyOnWriteArraySet full = populatedSet(3);
233	assertTrue(full.removeAll(Arrays.asList(one, two)));
234	assertEquals(1, full.size());
235	assertFalse(full.removeAll(Arrays.asList(one, two)));
236	assertEquals(1, full.size());
237	}
238
239	/**
240	* remove removes an element
241	*/
242	public void testRemove() {
243	CopyOnWriteArraySet full = populatedSet(3);
244	full.remove(one);
245	assertFalse(full.contains(one));
246	assertEquals(2, full.size());
247	}
248
249	/**
250	* size returns the number of elements
251	*/
252	public void testSize() {
253	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
254	CopyOnWriteArraySet full = populatedSet(3);
255	assertEquals(3, full.size());
256	assertEquals(0, empty.size());
257	}
258
259	/**
260	* toArray() returns an Object array containing all elements from
261	* the set in insertion order
262	*/
263	public void testToArray() {
264	Object[] a = new CopyOnWriteArraySet().toArray();
265	assertTrue(Arrays.equals(new Object[0], a));
266	assertSame(Object[].class, a.getClass());
267
268	Integer[] elements = new Integer[SIZE];
269	for (int i = 0; i < SIZE; i++)
270	elements[i] = i;
271	Collections.shuffle(Arrays.asList(elements));
272	Collection<Integer> full = populatedSet(elements);
273
274	assertTrue(Arrays.equals(elements, full.toArray()));
275	assertSame(Object[].class, full.toArray().getClass());
276	}
277
278	/**
279	* toArray(Integer array) returns an Integer array containing all
280	* elements from the set in insertion order
281	*/
282	public void testToArray2() {
283	Collection empty = new CopyOnWriteArraySet();
284	Integer[] a;
285
286	a = new Integer[0];
287	assertSame(a, empty.toArray(a));
288
289	a = new Integer[SIZE/2];
290	Arrays.fill(a, 42);
291	assertSame(a, empty.toArray(a));
292	assertNull(a[0]);
293	for (int i = 1; i < a.length; i++)
294	assertEquals(42, (int) a[i]);
295
296	Integer[] elements = new Integer[SIZE];
297	for (int i = 0; i < SIZE; i++)
298	elements[i] = i;
299	Collections.shuffle(Arrays.asList(elements));
300	Collection<Integer> full = populatedSet(elements);
301
302	Arrays.fill(a, 42);
303	assertTrue(Arrays.equals(elements, full.toArray(a)));
304	for (int i = 0; i < a.length; i++)
305	assertEquals(42, (int) a[i]);
306	assertSame(Integer[].class, full.toArray(a).getClass());
307
308	a = new Integer[SIZE];
309	Arrays.fill(a, 42);
310	assertSame(a, full.toArray(a));
311	assertTrue(Arrays.equals(elements, a));
312
313	a = new Integer[2*SIZE];
314	Arrays.fill(a, 42);
315	assertSame(a, full.toArray(a));
316	assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE)));
317	assertNull(a[SIZE]);
318	for (int i = SIZE + 1; i < a.length; i++)
319	assertEquals(42, (int) a[i]);
320	}
321
322	/**
323	* toArray throws an ArrayStoreException when the given array can
324	* not store the objects inside the set
325	*/
326	public void testToArray_ArrayStoreException() {
327	try {
328	CopyOnWriteArraySet c = new CopyOnWriteArraySet();
329	c.add("zfasdfsdf");
330	c.add("asdadasd");
331	c.toArray(new Long[5]);
332	shouldThrow();
333	} catch (ArrayStoreException success) {}
334	}
335
336	/**
337	* A deserialized serialized set is equal
338	*/
339	public void testSerialization() throws Exception {
340	Set x = populatedSet(SIZE);
341	Set y = serialClone(x);
342
343	assertNotSame(y, x);
344	assertEquals(x.size(), y.size());
345	assertEquals(x.toString(), y.toString());
346	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
347	assertEquals(x, y);
348	assertEquals(y, x);
349	}
350
351	/**
352	* addAll is idempotent
353	*/
354	public void testAddAll_idempotent() throws Exception {
355	Set x = populatedSet(SIZE);
356	Set y = new CopyOnWriteArraySet(x);
357	y.addAll(x);
358	assertEquals(x, y);
359	assertEquals(y, x);
360	}
361
362	}