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CopyOnWriteArrayListTest.javaAPI DocAndroid 1.5 API18393Wed May 06 22:41:02 BST 2009tests.api.java.util.concurrent

CopyOnWriteArrayListTest

public class CopyOnWriteArrayListTest extends JSR166TestCase

Fields Summary
Constructors Summary
Methods Summary
public static voidmain(java.lang.String[] args)

        junit.textui.TestRunner.run (suite());
static java.util.concurrent.CopyOnWriteArrayListpopulatedArray(int n)

        CopyOnWriteArrayList a = new CopyOnWriteArrayList();
        assertTrue(a.isEmpty());
        for (int i = 0; i < n; ++i) 
            a.add(new Integer(i));
        assertFalse(a.isEmpty());
        assertEquals(n, a.size());
        return a;
public static junit.framework.Testsuite()

        return new TestSuite(CopyOnWriteArrayListTest.class);
public voidtestAdd1_IndexOutOfBoundsException()
add throws an IndexOutOfBoundsException on a negative index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.add(-1,"qwerty");
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestAdd2_IndexOutOfBoundsException()
add throws an IndexOutOfBoundsException on a too high index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.add("asdasd");
            c.add("asdasdasd");
            c.add(100, "qwerty");
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestAddAll()
addAll adds each element from the given collection

        CopyOnWriteArrayList full = populatedArray(3);
        Vector v = new Vector();
        v.add(three);
        v.add(four);
        v.add(five);
        full.addAll(v);
        assertEquals(6, full.size());
public voidtestAddAll1_IndexOutOfBoundsException()
addAll throws an IndexOutOfBoundsException on a negative index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.addAll(-1,new LinkedList());
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestAddAll2_IndexOutOfBoundsException()
addAll throws an IndexOutOfBoundsException on a too high index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.add("asdasd");
            c.add("asdasdasd");
            c.addAll(100, new LinkedList());
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestAddAllAbsent()
addAllAbsent adds each element from the given collection that did not already exist in the List

        CopyOnWriteArrayList full = populatedArray(3);
        Vector v = new Vector();
        v.add(three);
        v.add(four);
        v.add(one); // will not add this element
        full.addAllAbsent(v);
        assertEquals(5, full.size());
public voidtestAddIfAbsent()
addIfAbsent will not add the element if it already exists in the list

        CopyOnWriteArrayList full = populatedArray(SIZE);
        full.addIfAbsent(one);
        assertEquals(SIZE, full.size());
public voidtestAddIfAbsent2()
addIfAbsent adds the element when it does not exist in the list

        CopyOnWriteArrayList full = populatedArray(SIZE);
        full.addIfAbsent(three);
        assertTrue(full.contains(three));
public voidtestAddIndex()
adding at an index places it in the indicated index

        CopyOnWriteArrayList full = populatedArray(3);
        full.add(0, m1);
        assertEquals(4, full.size());
        assertEquals(m1, full.get(0));
        assertEquals(zero, full.get(1));

        full.add(2, m2);
        assertEquals(5, full.size());
        assertEquals(m2, full.get(2));
        assertEquals(two, full.get(4));
public voidtestClear()
clear removes all elements from the list

        CopyOnWriteArrayList full = populatedArray(SIZE);
        full.clear();
        assertEquals(0, full.size());
public voidtestClone()
Cloned list is equal

        CopyOnWriteArrayList l1 = populatedArray(SIZE);
        CopyOnWriteArrayList l2 = (CopyOnWriteArrayList)(l1.clone());
        assertEquals(l1, l2);
        l1.clear();
        assertFalse(l1.equals(l2));
public voidtestConstructor()
a new list is empty

        CopyOnWriteArrayList a = new CopyOnWriteArrayList();
        assertTrue(a.isEmpty());
public voidtestConstructor2()
new list contains all elements of initializing array

        Integer[] ints = new Integer[SIZE];
        for (int i = 0; i < SIZE-1; ++i)
            ints[i] = new Integer(i);
        CopyOnWriteArrayList a = new CopyOnWriteArrayList(ints);
        for (int i = 0; i < SIZE; ++i) 
            assertEquals(ints[i], a.get(i));
public voidtestConstructor3()
new list contains all elements of initializing collection

        Integer[] ints = new Integer[SIZE];
        for (int i = 0; i < SIZE-1; ++i)
            ints[i] = new Integer(i);
        CopyOnWriteArrayList a = new CopyOnWriteArrayList(Arrays.asList(ints));
        for (int i = 0; i < SIZE; ++i) 
            assertEquals(ints[i], a.get(i));
public voidtestContains()
contains is true for added elements

        CopyOnWriteArrayList full = populatedArray(3);
        assertTrue(full.contains(one));
        assertFalse(full.contains(five));
public voidtestContainsAll()
containsAll returns true for collection with subset of elements

        CopyOnWriteArrayList full = populatedArray(3);
        Vector v = new Vector();
        v.add(one);
        v.add(two);
        assertTrue(full.containsAll(v));
        v.add(six);
        assertFalse(full.containsAll(v));
public voidtestEquals()
lists with same elements are equal and have same hashCode

        CopyOnWriteArrayList a = populatedArray(3);
        CopyOnWriteArrayList b = populatedArray(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());
public voidtestGet()
get returns the value at the given index

        CopyOnWriteArrayList full = populatedArray(3);
        assertEquals(0, ((Integer)full.get(0)).intValue());
public voidtestGet1_IndexOutOfBoundsException()
get throws an IndexOutOfBoundsException on a negative index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.get(-1);
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestGet2_IndexOutOfBoundsException()
get throws an IndexOutOfBoundsException on a too high index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.add("asdasd");
            c.add("asdad");
            c.get(100);
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestIndexOf()
indexOf gives the index for the given object

        CopyOnWriteArrayList full = populatedArray(3);
        assertEquals(1, full.indexOf(one));
        assertEquals(-1, full.indexOf("puppies"));
public voidtestIndexOf2()
indexOf gives the index based on the given index at which to start searching

        CopyOnWriteArrayList full = populatedArray(3);
        assertEquals(1, full.indexOf(one, 0));
        assertEquals(-1, full.indexOf(one, 2));
public voidtestIsEmpty()
isEmpty returns true when empty, else false

        CopyOnWriteArrayList empty = new CopyOnWriteArrayList();
        CopyOnWriteArrayList full = populatedArray(SIZE);
        assertTrue(empty.isEmpty());
        assertFalse(full.isEmpty());
public voidtestIterator()
iterator() returns an iterator containing the elements of the list

        CopyOnWriteArrayList full = populatedArray(SIZE);
        Iterator i = full.iterator();
        int j;
        for(j = 0; i.hasNext(); j++)
            assertEquals(j, ((Integer)i.next()).intValue());
        assertEquals(SIZE, j);
public voidtestIteratorRemove()
iterator.remove throws UnsupportedOperationException

        CopyOnWriteArrayList full = populatedArray(SIZE);
        Iterator it = full.iterator();
        it.next();
        try {
            it.remove();
            shouldThrow();
        }
        catch (UnsupportedOperationException success) {}
public voidtestLastIndexOf1()
lastIndexOf returns the index for the given object

        CopyOnWriteArrayList full = populatedArray(3);
        full.add(one);
        full.add(three);
        assertEquals(3, full.lastIndexOf(one));
        assertEquals(-1, full.lastIndexOf(six));
public voidtestListIterator1()
listIterator traverses all elements

        CopyOnWriteArrayList full = populatedArray(SIZE);
        ListIterator i = full.listIterator();
        int j;
        for(j = 0; i.hasNext(); j++)
            assertEquals(j, ((Integer)i.next()).intValue());
        assertEquals(SIZE, j);
public voidtestListIterator1_IndexOutOfBoundsException()
listIterator throws an IndexOutOfBoundsException on a negative index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.listIterator(-1);
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestListIterator2()
listIterator only returns those elements after the given index

        CopyOnWriteArrayList full = populatedArray(3);
        ListIterator i = full.listIterator(1);
        int j;
        for(j = 0; i.hasNext(); j++)
            assertEquals(j+1, ((Integer)i.next()).intValue());
        assertEquals(2, j);
public voidtestListIterator2_IndexOutOfBoundsException()
listIterator throws an IndexOutOfBoundsException on a too high index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.add("adasd");
            c.add("asdasdas");
            c.listIterator(100);
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestRemove()
remove removes and returns the object at the given index

        CopyOnWriteArrayList full = populatedArray(3);
        assertEquals(two, full.remove(2));
        assertEquals(2, full.size());
public voidtestRemove1_IndexOutOfBounds()
remove throws an IndexOutOfBoundsException on a negative index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.remove(-1);
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestRemove2_IndexOutOfBounds()
remove throws an IndexOutOfBoundsException on a too high index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.add("asdasd");
            c.add("adasdasd");
            c.remove(100);
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestRemoveAll()
removeAll removes all elements from the given collection

        CopyOnWriteArrayList full = populatedArray(3);
        Vector v = new Vector();
        v.add(one);
        v.add(two);
        full.removeAll(v);
        assertEquals(1, full.size());
public voidtestSerialization()
a deserialized serialiszed list is equal

        CopyOnWriteArrayList q = populatedArray(SIZE);

        try {
            ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
            ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
            out.writeObject(q);
            out.close();

            ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
            ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
            CopyOnWriteArrayList r = (CopyOnWriteArrayList)in.readObject();
            assertEquals(q.size(), r.size());
            assertTrue(q.equals(r));
            assertTrue(r.equals(q));
        } catch(Exception e){
            unexpectedException();
        }
public voidtestSet()
set changes the element at the given index

        CopyOnWriteArrayList full = populatedArray(3);
        assertEquals(two, full.set(2, four));
        assertEquals(4, ((Integer)full.get(2)).intValue());
public voidtestSet1_IndexOutOfBoundsException()
set throws an IndexOutOfBoundsException on a negative index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.set(-1,"qwerty");
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestSet2()
set throws an IndexOutOfBoundsException on a too high index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.add("asdasd");
            c.add("asdad");
            c.set(100, "qwerty");
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestSize()
size returns the number of elements

        CopyOnWriteArrayList empty = new CopyOnWriteArrayList();
        CopyOnWriteArrayList full = populatedArray(SIZE);
        assertEquals(SIZE, full.size());
        assertEquals(0, empty.size());
public voidtestSubList()
sublists contains elements at indexes offset from their base

        CopyOnWriteArrayList a = populatedArray(10);
        assertTrue(a.subList(1,1).isEmpty());
        for(int j = 0; j < 9; ++j) {
            for(int i = j ; i < 10; ++i) {
                List b = a.subList(j,i);
                for(int k = j; k < i; ++k) {
                    assertEquals(new Integer(k), b.get(k-j));
                }
            }
        }

        List s = a.subList(2, 5);
        assertEquals(s.size(), 3);
        s.set(2, m1);
        assertEquals(a.get(4), m1);
        s.clear();
        assertEquals(a.size(), 7);
public voidtestSubList1_IndexOutOfBoundsException()
subList throws an IndexOutOfBoundsException on a negative index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.subList(-1,100);

            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestSubList2_IndexOutOfBoundsException()
subList throws an IndexOutOfBoundsException on a too high index

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.add("asdasd");
            c.subList(1,100);
            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestSubList3_IndexOutOfBoundsException()
subList throws IndexOutOfBoundsException when the second index is lower then the first

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.subList(3,1);

            shouldThrow();
        } catch(IndexOutOfBoundsException e){}
public voidtestToArray()
toArray returns an Object array containing all elements from the list

        CopyOnWriteArrayList full = populatedArray(3);
        Object[] o = full.toArray();
        assertEquals(3, o.length);
        assertEquals(0, ((Integer)o[0]).intValue());
        assertEquals(1, ((Integer)o[1]).intValue());
        assertEquals(2, ((Integer)o[2]).intValue());
public voidtestToArray2()
toArray returns an Integer array containing all elements from the list

        CopyOnWriteArrayList full = populatedArray(3);
        Integer[] i = new Integer[3];
        i = (Integer[])full.toArray(i);
        assertEquals(3, i.length);
        assertEquals(0, i[0].intValue());
        assertEquals(1, i[1].intValue());
        assertEquals(2, i[2].intValue());
public voidtestToArray_ArrayStoreException()
toArray throws an ArrayStoreException when the given array can not store the objects inside the list

        try {
            CopyOnWriteArrayList c = new CopyOnWriteArrayList();
            c.add("zfasdfsdf");
            c.add("asdadasd");
            c.toArray(new Long[5]);
            shouldThrow();
        } catch(ArrayStoreException e){}
public voidtestToString()
toString contains toString of elements

        CopyOnWriteArrayList full = populatedArray(3);
        String s = full.toString();
        for (int i = 0; i < 3; ++i) {
            assertTrue(s.indexOf(String.valueOf(i)) >= 0);
        }
public voidtestlastIndexOf2()
lastIndexOf returns the index from the given starting point

        CopyOnWriteArrayList full = populatedArray(3);
        full.add(one);
        full.add(three);
        assertEquals(3, full.lastIndexOf(one, 4));
        assertEquals(-1, full.lastIndexOf(three, 3));