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);

        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:	1.27
Committed:	Thu May 30 03:28:55 2013 UTC (10 years, 11 months ago) by jsr166
Branch:	MAIN
Changes since 1.26:	+1 -1 lines
Log Message:	prefer assertNotSame, assertNotNull to assertTrue
#	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 junit.framework.*;
10	import java.util.ArrayList;
11	import java.util.Arrays;
12	import java.util.Collection;
13	import java.util.Collections;
14	import java.util.Iterator;
15	import java.util.NoSuchElementException;
16	import java.util.Set;
17	import java.util.Vector;
18	import java.util.concurrent.CopyOnWriteArraySet;
19
20	public class CopyOnWriteArraySetTest extends JSR166TestCase {
21	public static void main(String[] args) {
22	junit.textui.TestRunner.run(suite());
23	}
24	public static Test suite() {
25	return new TestSuite(CopyOnWriteArraySetTest.class);
26	}
27
28	static CopyOnWriteArraySet<Integer> populatedSet(int n) {
29	CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
30	assertTrue(a.isEmpty());
31	for (int i = 0; i < n; i++)
32	a.add(i);
33	assertFalse(a.isEmpty());
34	assertEquals(n, a.size());
35	return a;
36	}
37
38	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	/**
49	* Default-constructed set is empty
50	*/
51	public void testConstructor() {
52	CopyOnWriteArraySet a = new CopyOnWriteArraySet();
53	assertTrue(a.isEmpty());
54	}
55
56	/**
57	* Collection-constructed set holds all of its elements
58	*/
59	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	CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints));
64	for (int i = 0; i < SIZE; ++i)
65	assertTrue(a.contains(ints[i]));
66	}
67
68	/**
69	* addAll adds each element from the given collection
70	*/
71	public void testAddAll() {
72	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	}
80
81	/**
82	* addAll adds each element from the given collection that did not
83	* already exist in the set
84	*/
85	public void testAddAll2() {
86	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	}
94
95	/**
96	* add will not add the element if it already exists in the set
97	*/
98	public void testAdd2() {
99	CopyOnWriteArraySet full = populatedSet(3);
100	full.add(one);
101	assertEquals(3, full.size());
102	}
103
104	/**
105	* add adds the element when it does not exist in the set
106	*/
107	public void testAdd3() {
108	CopyOnWriteArraySet full = populatedSet(3);
109	full.add(three);
110	assertTrue(full.contains(three));
111	}
112
113	/**
114	* clear removes all elements from the set
115	*/
116	public void testClear() {
117	CopyOnWriteArraySet full = populatedSet(3);
118	full.clear();
119	assertEquals(0, full.size());
120	}
121
122	/**
123	* contains returns true for added elements
124	*/
125	public void testContains() {
126	CopyOnWriteArraySet full = populatedSet(3);
127	assertTrue(full.contains(one));
128	assertFalse(full.contains(five));
129	}
130
131	/**
132	* Sets with equal elements are equal
133	*/
134	public void testEquals() {
135	CopyOnWriteArraySet a = populatedSet(3);
136	CopyOnWriteArraySet b = populatedSet(3);
137	assertTrue(a.equals(b));
138	assertTrue(b.equals(a));
139	assertEquals(a.hashCode(), b.hashCode());
140	a.add(m1);
141	assertFalse(a.equals(b));
142	assertFalse(b.equals(a));
143	b.add(m1);
144	assertTrue(a.equals(b));
145	assertTrue(b.equals(a));
146	assertEquals(a.hashCode(), b.hashCode());
147	}
148
149	/**
150	* containsAll returns true for collections with subset of elements
151	*/
152	public void testContainsAll() {
153	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	}
161
162	/**
163	* isEmpty is true when empty, else false
164	*/
165	public void testIsEmpty() {
166	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
167	CopyOnWriteArraySet full = populatedSet(3);
168	assertTrue(empty.isEmpty());
169	assertFalse(full.isEmpty());
170	}
171
172	/**
173	* iterator() returns an iterator containing the elements of the
174	* set in insertion order
175	*/
176	public void testIterator() {
177	Collection empty = new CopyOnWriteArraySet();
178	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	}
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	Vector v = new Vector();
234	v.add(one);
235	v.add(two);
236	full.removeAll(v);
237	assertEquals(1, full.size());
238	}
239
240	/**
241	* remove removes an element
242	*/
243	public void testRemove() {
244	CopyOnWriteArraySet full = populatedSet(3);
245	full.remove(one);
246	assertFalse(full.contains(one));
247	assertEquals(2, full.size());
248	}
249
250	/**
251	* size returns the number of elements
252	*/
253	public void testSize() {
254	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
255	CopyOnWriteArraySet full = populatedSet(3);
256	assertEquals(3, full.size());
257	assertEquals(0, empty.size());
258	}
259
260	/**
261	* toArray() returns an Object array containing all elements from
262	* the set in insertion order
263	*/
264	public void testToArray() {
265	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	for (int i = 0; i < SIZE; i++)
271	elements[i] = i;
272	Collections.shuffle(Arrays.asList(elements));
273	Collection<Integer> full = populatedSet(elements);
274
275	assertTrue(Arrays.equals(elements, full.toArray()));
276	assertSame(Object[].class, full.toArray().getClass());
277	}
278
279	/**
280	* toArray(Integer array) returns an Integer array containing all
281	* elements from the set in insertion order
282	*/
283	public void testToArray2() {
284	Collection empty = new CopyOnWriteArraySet();
285	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	for (int i = 0; i < SIZE; i++)
299	elements[i] = i;
300	Collections.shuffle(Arrays.asList(elements));
301	Collection<Integer> full = populatedSet(elements);
302
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	}
322
323	/**
324	* toArray throws an ArrayStoreException when the given array can
325	* not store the objects inside the set
326	*/
327	public void testToArray_ArrayStoreException() {
328	try {
329	CopyOnWriteArraySet c = new CopyOnWriteArraySet();
330	c.add("zfasdfsdf");
331	c.add("asdadasd");
332	c.toArray(new Long[5]);
333	shouldThrow();
334	} catch (ArrayStoreException success) {}
335	}
336
337	/**
338	* A deserialized serialized set is equal
339	*/
340	public void testSerialization() throws Exception {
341	Set x = populatedSet(SIZE);
342	Set y = serialClone(x);
343
344	assertNotSame(y, x);
345	assertEquals(x.size(), y.size());
346	assertEquals(x.toString(), y.toString());
347	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
348	assertEquals(x, y);
349	assertEquals(y, x);
350	}
351
352	/**
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	}