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.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() {
        Set 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() {
        CopyOnWriteArraySet full = populatedSet(3);
        String s = full.toString();
        for (int i = 0; i < 3; ++i) {
            assertTrue(s.contains(String.valueOf(i)));
        }
    }

    /**
     * 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);

        assertTrue(x != y);
        assertEquals(x.size(), y.size());
        assertEquals(x.toString(), y.toString());
        assertTrue(Arrays.equals(x.toArray(), y.toArray()));
        assertEquals(x, y);
        assertEquals(y, x);
    }

}
Revision:	1.24
Committed:	Tue Nov 29 20:59:24 2011 UTC (12 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.23:	+26 -7 lines
Log Message:	improve testIterator
#	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.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	public class CopyOnWriteArraySetTest extends JSR166TestCase {
20	public static void main(String[] args) {
21	junit.textui.TestRunner.run(suite());
22	}
23	public static Test suite() {
24	return new TestSuite(CopyOnWriteArraySetTest.class);
25	}
26
27	static CopyOnWriteArraySet<Integer> populatedSet(int n) {
28	CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
29	assertTrue(a.isEmpty());
30	for (int i = 0; i < n; i++)
31	a.add(i);
32	assertFalse(a.isEmpty());
33	assertEquals(n, a.size());
34	return a;
35	}
36
37	static CopyOnWriteArraySet populatedSet(Integer[] elements) {
38	CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
39	assertTrue(a.isEmpty());
40	for (int i = 0; i < elements.length; i++)
41	a.add(elements[i]);
42	assertFalse(a.isEmpty());
43	assertEquals(elements.length, a.size());
44	return a;
45	}
46
47	/**
48	* Default-constructed set is empty
49	*/
50	public void testConstructor() {
51	CopyOnWriteArraySet a = new CopyOnWriteArraySet();
52	assertTrue(a.isEmpty());
53	}
54
55	/**
56	* Collection-constructed set holds all of its elements
57	*/
58	public void testConstructor3() {
59	Integer[] ints = new Integer[SIZE];
60	for (int i = 0; i < SIZE-1; ++i)
61	ints[i] = new Integer(i);
62	CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints));
63	for (int i = 0; i < SIZE; ++i)
64	assertTrue(a.contains(ints[i]));
65	}
66
67	/**
68	* addAll adds each element from the given collection
69	*/
70	public void testAddAll() {
71	CopyOnWriteArraySet full = populatedSet(3);
72	Vector v = new Vector();
73	v.add(three);
74	v.add(four);
75	v.add(five);
76	full.addAll(v);
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	Vector v = new Vector();
87	v.add(three);
88	v.add(four);
89	v.add(one); // will not add this element
90	full.addAll(v);
91	assertEquals(5, full.size());
92	}
93
94	/**
95	* add will not add the element if it already exists in the set
96	*/
97	public void testAdd2() {
98	CopyOnWriteArraySet full = populatedSet(3);
99	full.add(one);
100	assertEquals(3, full.size());
101	}
102
103	/**
104	* add adds the element when it does not exist in the set
105	*/
106	public void testAdd3() {
107	CopyOnWriteArraySet full = populatedSet(3);
108	full.add(three);
109	assertTrue(full.contains(three));
110	}
111
112	/**
113	* clear removes all elements from the set
114	*/
115	public void testClear() {
116	CopyOnWriteArraySet full = populatedSet(3);
117	full.clear();
118	assertEquals(0, full.size());
119	}
120
121	/**
122	* contains returns true for added elements
123	*/
124	public void testContains() {
125	CopyOnWriteArraySet full = populatedSet(3);
126	assertTrue(full.contains(one));
127	assertFalse(full.contains(five));
128	}
129
130	/**
131	* Sets with equal elements are equal
132	*/
133	public void testEquals() {
134	CopyOnWriteArraySet a = populatedSet(3);
135	CopyOnWriteArraySet b = populatedSet(3);
136	assertTrue(a.equals(b));
137	assertTrue(b.equals(a));
138	assertEquals(a.hashCode(), b.hashCode());
139	a.add(m1);
140	assertFalse(a.equals(b));
141	assertFalse(b.equals(a));
142	b.add(m1);
143	assertTrue(a.equals(b));
144	assertTrue(b.equals(a));
145	assertEquals(a.hashCode(), b.hashCode());
146	}
147
148	/**
149	* containsAll returns true for collections with subset of elements
150	*/
151	public void testContainsAll() {
152	CopyOnWriteArraySet full = populatedSet(3);
153	Vector v = new Vector();
154	v.add(one);
155	v.add(two);
156	assertTrue(full.containsAll(v));
157	v.add(six);
158	assertFalse(full.containsAll(v));
159	}
160
161	/**
162	* isEmpty is true when empty, else false
163	*/
164	public void testIsEmpty() {
165	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
166	CopyOnWriteArraySet full = populatedSet(3);
167	assertTrue(empty.isEmpty());
168	assertFalse(full.isEmpty());
169	}
170
171	/**
172	* iterator() returns an iterator containing the elements of the
173	* set in insertion order
174	*/
175	public void testIterator() {
176	Set empty = new CopyOnWriteArraySet();
177	assertFalse(empty.iterator().hasNext());
178	try {
179	empty.iterator().next();
180	shouldThrow();
181	} catch (NoSuchElementException success) {}
182
183	Integer[] elements = new Integer[SIZE];
184	for (int i = 0; i < SIZE; i++)
185	elements[i] = i;
186	Collections.shuffle(Arrays.asList(elements));
187	Collection<Integer> full = populatedSet(elements);
188
189	Iterator it = full.iterator();
190	for (int j = 0; j < SIZE; j++) {
191	assertTrue(it.hasNext());
192	assertEquals(elements[j], it.next());
193	}
194	assertFalse(it.hasNext());
195	try {
196	it.next();
197	shouldThrow();
198	} catch (NoSuchElementException success) {}
199	}
200
201	/**
202	* iterator remove is unsupported
203	*/
204	public void testIteratorRemove() {
205	CopyOnWriteArraySet full = populatedSet(3);
206	Iterator it = full.iterator();
207	it.next();
208	try {
209	it.remove();
210	shouldThrow();
211	} catch (UnsupportedOperationException success) {}
212	}
213
214	/**
215	* toString holds toString of elements
216	*/
217	public void testToString() {
218	CopyOnWriteArraySet full = populatedSet(3);
219	String s = full.toString();
220	for (int i = 0; i < 3; ++i) {
221	assertTrue(s.contains(String.valueOf(i)));
222	}
223	}
224
225	/**
226	* removeAll removes all elements from the given collection
227	*/
228	public void testRemoveAll() {
229	CopyOnWriteArraySet full = populatedSet(3);
230	Vector v = new Vector();
231	v.add(one);
232	v.add(two);
233	full.removeAll(v);
234	assertEquals(1, full.size());
235	}
236
237	/**
238	* remove removes an element
239	*/
240	public void testRemove() {
241	CopyOnWriteArraySet full = populatedSet(3);
242	full.remove(one);
243	assertFalse(full.contains(one));
244	assertEquals(2, full.size());
245	}
246
247	/**
248	* size returns the number of elements
249	*/
250	public void testSize() {
251	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
252	CopyOnWriteArraySet full = populatedSet(3);
253	assertEquals(3, full.size());
254	assertEquals(0, empty.size());
255	}
256
257	/**
258	* toArray() returns an Object array containing all elements from
259	* the set in insertion order
260	*/
261	public void testToArray() {
262	Object[] a = new CopyOnWriteArraySet().toArray();
263	assertTrue(Arrays.equals(new Object[0], a));
264	assertSame(Object[].class, a.getClass());
265
266	Integer[] elements = new Integer[SIZE];
267	for (int i = 0; i < SIZE; i++)
268	elements[i] = i;
269	Collections.shuffle(Arrays.asList(elements));
270	Collection<Integer> full = populatedSet(elements);
271
272	assertTrue(Arrays.equals(elements, full.toArray()));
273	assertSame(Object[].class, full.toArray().getClass());
274	}
275
276	/**
277	* toArray(Integer array) returns an Integer array containing all
278	* elements from the set in insertion order
279	*/
280	public void testToArray2() {
281	Collection empty = new CopyOnWriteArraySet();
282	Integer[] a;
283
284	a = new Integer[0];
285	assertSame(a, empty.toArray(a));
286
287	a = new Integer[SIZE/2];
288	Arrays.fill(a, 42);
289	assertSame(a, empty.toArray(a));
290	assertNull(a[0]);
291	for (int i = 1; i < a.length; i++)
292	assertEquals(42, (int) a[i]);
293
294	Integer[] elements = new Integer[SIZE];
295	for (int i = 0; i < SIZE; i++)
296	elements[i] = i;
297	Collections.shuffle(Arrays.asList(elements));
298	Collection<Integer> full = populatedSet(elements);
299
300	Arrays.fill(a, 42);
301	assertTrue(Arrays.equals(elements, full.toArray(a)));
302	for (int i = 0; i < a.length; i++)
303	assertEquals(42, (int) a[i]);
304	assertSame(Integer[].class, full.toArray(a).getClass());
305
306	a = new Integer[SIZE];
307	Arrays.fill(a, 42);
308	assertSame(a, full.toArray(a));
309	assertTrue(Arrays.equals(elements, a));
310
311	a = new Integer[2*SIZE];
312	Arrays.fill(a, 42);
313	assertSame(a, full.toArray(a));
314	assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE)));
315	assertNull(a[SIZE]);
316	for (int i = SIZE + 1; i < a.length; i++)
317	assertEquals(42, (int) a[i]);
318	}
319
320	/**
321	* toArray throws an ArrayStoreException when the given array can
322	* not store the objects inside the set
323	*/
324	public void testToArray_ArrayStoreException() {
325	try {
326	CopyOnWriteArraySet c = new CopyOnWriteArraySet();
327	c.add("zfasdfsdf");
328	c.add("asdadasd");
329	c.toArray(new Long[5]);
330	shouldThrow();
331	} catch (ArrayStoreException success) {}
332	}
333
334	/**
335	* A deserialized serialized set is equal
336	*/
337	public void testSerialization() throws Exception {
338	Set x = populatedSet(SIZE);
339	Set y = serialClone(x);
340
341	assertTrue(x != y);
342	assertEquals(x.size(), y.size());
343	assertEquals(x.toString(), y.toString());
344	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
345	assertEquals(x, y);
346	assertEquals(y, x);
347	}
348
349	}