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
#	User	Rev	Content
1	dl	1.1	/*
2	dl	1.6	* 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	jsr166	1.17	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.8	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import junit.framework.*;
10	jsr166	1.19	import java.util.Arrays;
11	jsr166	1.22	import java.util.Collection;
12	jsr166	1.21	import java.util.Collections;
13	jsr166	1.19	import java.util.Iterator;
14	jsr166	1.24	import java.util.NoSuchElementException;
15	jsr166	1.19	import java.util.Set;
16			import java.util.Vector;
17			import java.util.concurrent.CopyOnWriteArraySet;
18	dl	1.1
19	dl	1.3	public class CopyOnWriteArraySetTest extends JSR166TestCase {
20	dl	1.1	public static void main(String[] args) {
21	jsr166	1.15	junit.textui.TestRunner.run(suite());
22	dl	1.1	}
23			public static Test suite() {
24	jsr166	1.11	return new TestSuite(CopyOnWriteArraySetTest.class);
25	dl	1.1	}
26
27	jsr166	1.21	static CopyOnWriteArraySet<Integer> populatedSet(int n) {
28			CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>();
29	dl	1.1	assertTrue(a.isEmpty());
30	jsr166	1.22	for (int i = 0; i < n; i++)
31	jsr166	1.21	a.add(i);
32	dl	1.1	assertFalse(a.isEmpty());
33			assertEquals(n, a.size());
34			return a;
35			}
36
37	jsr166	1.21	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	dl	1.4	/**
48			* Default-constructed set is empty
49			*/
50	dl	1.3	public void testConstructor() {
51	jsr166	1.11	CopyOnWriteArraySet a = new CopyOnWriteArraySet();
52	dl	1.3	assertTrue(a.isEmpty());
53			}
54
55	dl	1.4	/**
56	dl	1.5	* Collection-constructed set holds all of its elements
57	dl	1.4	*/
58	dl	1.3	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	jsr166	1.11	CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints));
63	jsr166	1.8	for (int i = 0; i < SIZE; ++i)
64	dl	1.3	assertTrue(a.contains(ints[i]));
65			}
66	jsr166	1.8
67	dl	1.1	/**
68	jsr166	1.16	* addAll adds each element from the given collection
69	dl	1.1	*/
70	dl	1.4	public void testAddAll() {
71	jsr166	1.11	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	dl	1.1	}
79
80			/**
81	jsr166	1.16	* addAll adds each element from the given collection that did not
82			* already exist in the set
83	dl	1.1	*/
84	dl	1.4	public void testAddAll2() {
85	jsr166	1.11	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	dl	1.1	}
93
94			/**
95	jsr166	1.16	* add will not add the element if it already exists in the set
96	dl	1.1	*/
97	dl	1.4	public void testAdd2() {
98	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
99			full.add(one);
100			assertEquals(3, full.size());
101	dl	1.1	}
102
103			/**
104	jsr166	1.16	* add adds the element when it does not exist in the set
105	dl	1.1	*/
106	dl	1.4	public void testAdd3() {
107	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
108	dl	1.3	full.add(three);
109			assertTrue(full.contains(three));
110	dl	1.1	}
111
112			/**
113	jsr166	1.16	* clear removes all elements from the set
114	dl	1.1	*/
115	dl	1.4	public void testClear() {
116	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
117			full.clear();
118			assertEquals(0, full.size());
119	dl	1.1	}
120
121			/**
122	jsr166	1.16	* contains returns true for added elements
123	dl	1.1	*/
124	dl	1.4	public void testContains() {
125	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
126			assertTrue(full.contains(one));
127			assertFalse(full.contains(five));
128	dl	1.1	}
129
130	dl	1.4	/**
131			* Sets with equal elements are equal
132			*/
133	dl	1.1	public void testEquals() {
134	jsr166	1.11	CopyOnWriteArraySet a = populatedSet(3);
135			CopyOnWriteArraySet b = populatedSet(3);
136	dl	1.1	assertTrue(a.equals(b));
137			assertTrue(b.equals(a));
138			assertEquals(a.hashCode(), b.hashCode());
139	dl	1.3	a.add(m1);
140	dl	1.1	assertFalse(a.equals(b));
141			assertFalse(b.equals(a));
142	dl	1.3	b.add(m1);
143	dl	1.1	assertTrue(a.equals(b));
144			assertTrue(b.equals(a));
145			assertEquals(a.hashCode(), b.hashCode());
146			}
147
148			/**
149	jsr166	1.16	* containsAll returns true for collections with subset of elements
150	dl	1.1	*/
151	dl	1.4	public void testContainsAll() {
152	jsr166	1.11	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	dl	1.1	}
160
161			/**
162	jsr166	1.16	* isEmpty is true when empty, else false
163	dl	1.1	*/
164	dl	1.4	public void testIsEmpty() {
165	jsr166	1.11	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
166			CopyOnWriteArraySet full = populatedSet(3);
167			assertTrue(empty.isEmpty());
168			assertFalse(full.isEmpty());
169	dl	1.1	}
170
171			/**
172	jsr166	1.24	* iterator() returns an iterator containing the elements of the
173			* set in insertion order
174	dl	1.1	*/
175	dl	1.4	public void testIterator() {
176	jsr166	1.24	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	dl	1.1	}
200
201	dl	1.4	/**
202			* iterator remove is unsupported
203			*/
204	jsr166	1.15	public void testIteratorRemove() {
205	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
206	dl	1.1	Iterator it = full.iterator();
207			it.next();
208			try {
209			it.remove();
210	dl	1.4	shouldThrow();
211	jsr166	1.12	} catch (UnsupportedOperationException success) {}
212	dl	1.1	}
213
214	dl	1.4	/**
215			* toString holds toString of elements
216			*/
217			public void testToString() {
218	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
219	dl	1.1	String s = full.toString();
220			for (int i = 0; i < 3; ++i) {
221	jsr166	1.18	assertTrue(s.contains(String.valueOf(i)));
222	dl	1.1	}
223	jsr166	1.8	}
224	dl	1.1
225			/**
226	jsr166	1.16	* removeAll removes all elements from the given collection
227	dl	1.1	*/
228	dl	1.4	public void testRemoveAll() {
229	jsr166	1.11	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	dl	1.1	}
236
237	dl	1.4	/**
238			* remove removes an element
239			*/
240			public void testRemove() {
241	jsr166	1.11	CopyOnWriteArraySet full = populatedSet(3);
242			full.remove(one);
243	dl	1.3	assertFalse(full.contains(one));
244	jsr166	1.11	assertEquals(2, full.size());
245	dl	1.1	}
246
247			/**
248	jsr166	1.16	* size returns the number of elements
249	dl	1.1	*/
250	dl	1.4	public void testSize() {
251	jsr166	1.11	CopyOnWriteArraySet empty = new CopyOnWriteArraySet();
252			CopyOnWriteArraySet full = populatedSet(3);
253			assertEquals(3, full.size());
254			assertEquals(0, empty.size());
255	dl	1.1	}
256
257			/**
258	jsr166	1.21	* toArray() returns an Object array containing all elements from
259			* the set in insertion order
260	dl	1.1	*/
261	dl	1.4	public void testToArray() {
262	jsr166	1.21	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	jsr166	1.20	for (int i = 0; i < SIZE; i++)
268	jsr166	1.21	elements[i] = i;
269			Collections.shuffle(Arrays.asList(elements));
270	jsr166	1.22	Collection<Integer> full = populatedSet(elements);
271	jsr166	1.21
272			assertTrue(Arrays.equals(elements, full.toArray()));
273			assertSame(Object[].class, full.toArray().getClass());
274	dl	1.1	}
275
276			/**
277	jsr166	1.21	* toArray(Integer array) returns an Integer array containing all
278			* elements from the set in insertion order
279	dl	1.1	*/
280	dl	1.4	public void testToArray2() {
281	jsr166	1.22	Collection empty = new CopyOnWriteArraySet();
282	jsr166	1.21	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	jsr166	1.20	for (int i = 0; i < SIZE; i++)
296	jsr166	1.21	elements[i] = i;
297			Collections.shuffle(Arrays.asList(elements));
298	jsr166	1.22	Collection<Integer> full = populatedSet(elements);
299	jsr166	1.21
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	dl	1.1	}
319
320			/**
321	jsr166	1.16	* toArray throws an ArrayStoreException when the given array can
322			* not store the objects inside the set
323	dl	1.1	*/
324	dl	1.4	public void testToArray_ArrayStoreException() {
325			try {
326	dl	1.1	CopyOnWriteArraySet c = new CopyOnWriteArraySet();
327			c.add("zfasdfsdf");
328			c.add("asdadasd");
329			c.toArray(new Long[5]);
330	jsr166	1.11	shouldThrow();
331	jsr166	1.13	} catch (ArrayStoreException success) {}
332	dl	1.2	}
333
334	dl	1.4	/**
335	dl	1.7	* A deserialized serialized set is equal
336	dl	1.4	*/
337	jsr166	1.12	public void testSerialization() throws Exception {
338	jsr166	1.19	Set x = populatedSet(SIZE);
339			Set y = serialClone(x);
340	dl	1.2
341	jsr166	1.19	assertTrue(x != y);
342			assertEquals(x.size(), y.size());
343	jsr166	1.23	assertEquals(x.toString(), y.toString());
344			assertTrue(Arrays.equals(x.toArray(), y.toArray()));
345	jsr166	1.19	assertEquals(x, y);
346			assertEquals(y, x);
347	dl	1.1	}
348
349			}