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Commons Collections example source code file (TestIteratorUtils.java)

This example Commons Collections source code file (TestIteratorUtils.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

expecting, expecting, illegalargumentexception, illegalstateexception, indexoutofboundsexception, indexoutofboundsexception, integer, integer, iterator, listiterator, nosuchelementexception, resettableiterator, unsupportedoperationexception, unsupportedoperationexception, util

The Commons Collections TestIteratorUtils.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.commons.collections;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;

import junit.framework.Test;

import org.apache.commons.collections.iterators.EmptyIterator;
import org.apache.commons.collections.iterators.EmptyListIterator;
import org.apache.commons.collections.iterators.EmptyMapIterator;
import org.apache.commons.collections.iterators.EmptyOrderedIterator;
import org.apache.commons.collections.iterators.EmptyOrderedMapIterator;

/**
 * Tests for IteratorUtils.
 * 
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Unknown
 */
public class TestIteratorUtils extends BulkTest {

    public TestIteratorUtils(String name) {
        super(name);
    }

    public static void main(String args[]) {
        junit.textui.TestRunner.run(suite());
    }

    public static Test suite() {
        return BulkTest.makeSuite(TestIteratorUtils.class);
    }

    public void testToList() {
        List list = new ArrayList();
        list.add(new Integer(1));
        list.add("Two");
        list.add(null);
        List result = IteratorUtils.toList(list.iterator());
        assertEquals(list, result);
    }

    public void testToArray() {
        List list = new ArrayList();
        list.add(new Integer(1));
        list.add("Two");
        list.add(null);
        Object[] result = IteratorUtils.toArray(list.iterator());
        assertEquals(list, Arrays.asList(result));
    }

    public void testToArray2() {
        List list = new ArrayList();
        list.add("One");
        list.add("Two");
        list.add(null);
        String[] result = (String[]) IteratorUtils.toArray(list.iterator(), String.class);
        assertEquals(list, Arrays.asList(result));
    }
    
    public void testArrayIterator() {
        Object[] objArray = {"a", "b", "c"};
        ResettableIterator iterator = IteratorUtils.arrayIterator(objArray);
        assertTrue(iterator.next().equals("a"));
        assertTrue(iterator.next().equals("b"));
        iterator.reset();
        assertTrue(iterator.next().equals("a"));
        
        try {
            iterator = IteratorUtils.arrayIterator(new Integer(0));
            fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
                // expected
        }
        
        try {
            iterator = IteratorUtils.arrayIterator(null);
            fail("Expecting NullPointerException");
        } catch (NullPointerException ex) {
                // expected
        }
        
        iterator = IteratorUtils.arrayIterator(objArray, 1);
        assertTrue(iterator.next().equals("b"));
        
        try {
            iterator = IteratorUtils.arrayIterator(objArray, -1);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        iterator = IteratorUtils.arrayIterator(objArray, 3);
        assertTrue(!iterator.hasNext());
        iterator.reset();
        
        try {
            iterator = IteratorUtils.arrayIterator(objArray, 4);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        iterator = IteratorUtils.arrayIterator(objArray, 2, 3);
        assertTrue(iterator.next().equals("c"));
        
        try {
            iterator = IteratorUtils.arrayIterator(objArray, 2, 4);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        try {
            iterator = IteratorUtils.arrayIterator(objArray, -1, 1);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        try {
            iterator = IteratorUtils.arrayIterator(objArray, 2, 1);
            fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        
        int[] intArray = {0, 1, 2};
        iterator = IteratorUtils.arrayIterator(intArray);
        assertTrue(iterator.next().equals(new Integer(0)));
        assertTrue(iterator.next().equals(new Integer(1)));
        iterator.reset();
        assertTrue(iterator.next().equals(new Integer(0)));
        
        iterator = IteratorUtils.arrayIterator(intArray, 1);
        assertTrue(iterator.next().equals(new Integer(1)));
        
        try {
            iterator = IteratorUtils.arrayIterator(intArray, -1);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        iterator = IteratorUtils.arrayIterator(intArray, 3);
        assertTrue(!iterator.hasNext());
        iterator.reset();
        
        try {
            iterator = IteratorUtils.arrayIterator(intArray, 4);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        iterator = IteratorUtils.arrayIterator(intArray, 2, 3);
        assertTrue(iterator.next().equals(new Integer(2)));
        
        try {
            iterator = IteratorUtils.arrayIterator(intArray, 2, 4);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        try {
            iterator = IteratorUtils.arrayIterator(intArray, -1, 1);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        try {
            iterator = IteratorUtils.arrayIterator(intArray, 2, 1);
            fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }          
    }
    
    public void testArrayListIterator() {
        Object[] objArray = {"a", "b", "c", "d"};
        ResettableListIterator iterator = IteratorUtils.arrayListIterator(objArray);
        assertTrue(!iterator.hasPrevious());
        assertTrue(iterator.previousIndex() == -1);
        assertTrue(iterator.nextIndex() == 0);
        assertTrue(iterator.next().equals("a"));
        assertTrue(iterator.previous().equals("a"));
        assertTrue(iterator.next().equals("a"));
        assertTrue(iterator.previousIndex() == 0);
        assertTrue(iterator.nextIndex() == 1);
        assertTrue(iterator.next().equals("b"));
        assertTrue(iterator.next().equals("c"));
        assertTrue(iterator.next().equals("d"));
        assertTrue(iterator.nextIndex() == 4); // size of list
        assertTrue(iterator.previousIndex() == 3);
        
        try {
            iterator = IteratorUtils.arrayListIterator(new Integer(0));
            fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
                // expected
        }
        
        try {
            iterator = IteratorUtils.arrayListIterator(null);
            fail("Expecting NullPointerException");
        } catch (NullPointerException ex) {
                // expected
        }
        
        iterator = IteratorUtils.arrayListIterator(objArray, 1);
        assertTrue(iterator.previousIndex() == -1); 
        assertTrue(!iterator.hasPrevious());
        assertTrue(iterator.nextIndex() == 0); 
        assertTrue(iterator.next().equals("b"));
        assertTrue(iterator.previousIndex() == 0);        
        
        try {
            iterator = IteratorUtils.arrayListIterator(objArray, -1);
            fail("Expecting IndexOutOfBoundsException.");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        iterator = IteratorUtils.arrayListIterator(objArray, 3);
        assertTrue(iterator.hasNext());
        try {
            Object x = iterator.previous();
            fail("Expecting NoSuchElementException.");
        } catch (NoSuchElementException ex) {
            // expected
        }
        
        try {
            iterator = IteratorUtils.arrayListIterator(objArray, 5);
            fail("Expecting IndexOutOfBoundsException.");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        iterator = IteratorUtils.arrayListIterator(objArray, 2, 3);
        assertTrue(iterator.next().equals("c"));
        
        try {
            iterator = IteratorUtils.arrayListIterator(objArray, 2, 5);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        try {
            iterator = IteratorUtils.arrayListIterator(objArray, -1, 1);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        try {
            iterator = IteratorUtils.arrayListIterator(objArray, 2, 1);
            fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        
        int[] intArray = {0, 1, 2};
        iterator = IteratorUtils.arrayListIterator(intArray);
        assertTrue(iterator.previousIndex() == -1); 
        assertTrue(!iterator.hasPrevious());
        assertTrue(iterator.nextIndex() == 0); 
        assertTrue(iterator.next().equals(new Integer(0)));
        assertTrue(iterator.previousIndex() == 0); 
        assertTrue(iterator.nextIndex() == 1); 
        assertTrue(iterator.next().equals(new Integer(1)));
        assertTrue(iterator.previousIndex() == 1); 
        assertTrue(iterator.nextIndex() == 2); 
        assertTrue(iterator.previous().equals(new Integer(1)));
        assertTrue(iterator.next().equals(new Integer(1)));
        
        iterator = IteratorUtils.arrayListIterator(intArray, 1);
        assertTrue(iterator.previousIndex() == -1); 
        assertTrue(!iterator.hasPrevious());
        assertTrue(iterator.nextIndex() == 0); 
        assertTrue(iterator.next().equals(new Integer(1)));
        assertTrue(iterator.previous().equals(new Integer(1)));
        assertTrue(iterator.next().equals(new Integer(1)));
        assertTrue(iterator.previousIndex() == 0); 
        assertTrue(iterator.nextIndex() == 1); 
        assertTrue(iterator.next().equals(new Integer(2)));
        assertTrue(iterator.previousIndex() == 1); 
        assertTrue(iterator.nextIndex() == 2); 
        assertTrue(iterator.previous().equals(new Integer(2)));
        assertTrue(iterator.previousIndex() == 0); 
        assertTrue(iterator.nextIndex() == 1); 
        
        try {
            iterator = IteratorUtils.arrayListIterator(intArray, -1);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        iterator = IteratorUtils.arrayListIterator(intArray, 3);
        assertTrue(!iterator.hasNext());
     
        try {
            iterator = IteratorUtils.arrayListIterator(intArray, 4);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        iterator = IteratorUtils.arrayListIterator(intArray, 2, 3);
        assertTrue(!iterator.hasPrevious());
        assertTrue(iterator.previousIndex() == -1);
        assertTrue(iterator.next().equals(new Integer(2)));
        assertTrue(iterator.hasPrevious());
        assertTrue(!iterator.hasNext());
        
        
        try {
            iterator = IteratorUtils.arrayListIterator(intArray, 2, 4);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        try {
            iterator = IteratorUtils.arrayListIterator(intArray, -1, 1);
            fail("Expecting IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException ex) {
            // expected
        }
        
        try {
            iterator = IteratorUtils.arrayListIterator(intArray, 2, 1);
            fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }          
    }
        

    /**
     * Gets an immutable Iterator operating on the elements ["a", "b", "c", "d"].
     */
    private Iterator getImmutableIterator() {
        List list = new ArrayList();
        list.add("a");
        list.add("b");
        list.add("c");
        list.add("d");
        return IteratorUtils.unmodifiableIterator(list.iterator());
    }

    /**
     * Gets an immutable ListIterator operating on the elements ["a", "b", "c", "d"].
     */
    private ListIterator getImmutableListIterator() {
        List list = new ArrayList();
        list.add("a");
        list.add("b");
        list.add("c");
        list.add("d");
        return IteratorUtils.unmodifiableListIterator(list.listIterator());
    }

    //-----------------------------------------------------------------------
    /**
     * Test empty iterator
     */
    public void testEmptyIterator() {
        assertSame(EmptyIterator.INSTANCE, IteratorUtils.EMPTY_ITERATOR);
        assertSame(EmptyIterator.RESETTABLE_INSTANCE, IteratorUtils.EMPTY_ITERATOR);
        assertEquals(true, IteratorUtils.EMPTY_ITERATOR instanceof Iterator);
        assertEquals(true, IteratorUtils.EMPTY_ITERATOR instanceof ResettableIterator);
        assertEquals(false, IteratorUtils.EMPTY_ITERATOR instanceof OrderedIterator);
        assertEquals(false, IteratorUtils.EMPTY_ITERATOR instanceof ListIterator);
        assertEquals(false, IteratorUtils.EMPTY_ITERATOR instanceof MapIterator);
        assertEquals(false, IteratorUtils.EMPTY_ITERATOR.hasNext());
        IteratorUtils.EMPTY_ITERATOR.reset();
        assertSame(IteratorUtils.EMPTY_ITERATOR, IteratorUtils.EMPTY_ITERATOR);
        assertSame(IteratorUtils.EMPTY_ITERATOR, IteratorUtils.emptyIterator());
        try {
            IteratorUtils.EMPTY_ITERATOR.next();
            fail();
        } catch (NoSuchElementException ex) {}
        try {
            IteratorUtils.EMPTY_ITERATOR.remove();
            fail();
        } catch (IllegalStateException ex) {}
    }
    
    //-----------------------------------------------------------------------
    /**
     * Test empty list iterator
     */
    public void testEmptyListIterator() {
        assertSame(EmptyListIterator.INSTANCE, IteratorUtils.EMPTY_LIST_ITERATOR);
        assertSame(EmptyListIterator.RESETTABLE_INSTANCE, IteratorUtils.EMPTY_LIST_ITERATOR);
        assertEquals(true, IteratorUtils.EMPTY_LIST_ITERATOR instanceof Iterator);
        assertEquals(true, IteratorUtils.EMPTY_LIST_ITERATOR instanceof ListIterator);
        assertEquals(true, IteratorUtils.EMPTY_LIST_ITERATOR instanceof ResettableIterator);
        assertEquals(true, IteratorUtils.EMPTY_LIST_ITERATOR instanceof ResettableListIterator);
        assertEquals(false, IteratorUtils.EMPTY_LIST_ITERATOR instanceof MapIterator);
        assertEquals(false, IteratorUtils.EMPTY_LIST_ITERATOR.hasNext());
        assertEquals(0, IteratorUtils.EMPTY_LIST_ITERATOR.nextIndex());
        assertEquals(-1, IteratorUtils.EMPTY_LIST_ITERATOR.previousIndex());
        IteratorUtils.EMPTY_LIST_ITERATOR.reset();
        assertSame(IteratorUtils.EMPTY_LIST_ITERATOR, IteratorUtils.EMPTY_LIST_ITERATOR);
        assertSame(IteratorUtils.EMPTY_LIST_ITERATOR, IteratorUtils.emptyListIterator());
        try {
            IteratorUtils.EMPTY_LIST_ITERATOR.next();
            fail();
        } catch (NoSuchElementException ex) {}
        try {
            IteratorUtils.EMPTY_LIST_ITERATOR.previous();
            fail();
        } catch (NoSuchElementException ex) {}
        try {
            IteratorUtils.EMPTY_LIST_ITERATOR.remove();
            fail();
        } catch (IllegalStateException ex) {}
        try {
            IteratorUtils.EMPTY_LIST_ITERATOR.set(null);
            fail();
        } catch (IllegalStateException ex) {}
        try {
            IteratorUtils.EMPTY_LIST_ITERATOR.add(null);
            fail();
        } catch (UnsupportedOperationException ex) {}
    }
    
    //-----------------------------------------------------------------------
    /**
     * Test empty map iterator
     */
    public void testEmptyMapIterator() {
        assertSame(EmptyMapIterator.INSTANCE, IteratorUtils.EMPTY_MAP_ITERATOR);
        assertEquals(true, IteratorUtils.EMPTY_MAP_ITERATOR instanceof Iterator);
        assertEquals(true, IteratorUtils.EMPTY_MAP_ITERATOR instanceof MapIterator);
        assertEquals(true, IteratorUtils.EMPTY_MAP_ITERATOR instanceof ResettableIterator);
        assertEquals(false, IteratorUtils.EMPTY_MAP_ITERATOR instanceof ListIterator);
        assertEquals(false, IteratorUtils.EMPTY_MAP_ITERATOR instanceof OrderedIterator);
        assertEquals(false, IteratorUtils.EMPTY_MAP_ITERATOR instanceof OrderedMapIterator);
        assertEquals(false, IteratorUtils.EMPTY_MAP_ITERATOR.hasNext());
        ((ResettableIterator) IteratorUtils.EMPTY_MAP_ITERATOR).reset();
        assertSame(IteratorUtils.EMPTY_MAP_ITERATOR, IteratorUtils.EMPTY_MAP_ITERATOR);
        assertSame(IteratorUtils.EMPTY_MAP_ITERATOR, IteratorUtils.emptyMapIterator());
        try {
            IteratorUtils.EMPTY_MAP_ITERATOR.next();
            fail();
        } catch (NoSuchElementException ex) {}
        try {
            IteratorUtils.EMPTY_MAP_ITERATOR.remove();
            fail();
        } catch (IllegalStateException ex) {}
        try {
            IteratorUtils.EMPTY_MAP_ITERATOR.getKey();
            fail();
        } catch (IllegalStateException ex) {}
        try {
            IteratorUtils.EMPTY_MAP_ITERATOR.getValue();
            fail();
        } catch (IllegalStateException ex) {}
        try {
            IteratorUtils.EMPTY_MAP_ITERATOR.setValue(null);
            fail();
        } catch (IllegalStateException ex) {}
    }
    
    //-----------------------------------------------------------------------
    /**
     * Test empty map iterator
     */
    public void testEmptyOrderedIterator() {
        assertSame(EmptyOrderedIterator.INSTANCE, IteratorUtils.EMPTY_ORDERED_ITERATOR);
        assertEquals(true, IteratorUtils.EMPTY_ORDERED_ITERATOR instanceof Iterator);
        assertEquals(true, IteratorUtils.EMPTY_ORDERED_ITERATOR instanceof OrderedIterator);
        assertEquals(true, IteratorUtils.EMPTY_ORDERED_ITERATOR instanceof ResettableIterator);
        assertEquals(false, IteratorUtils.EMPTY_ORDERED_ITERATOR instanceof ListIterator);
        assertEquals(false, IteratorUtils.EMPTY_ORDERED_ITERATOR instanceof MapIterator);
        assertEquals(false, IteratorUtils.EMPTY_ORDERED_ITERATOR.hasNext());
        assertEquals(false, IteratorUtils.EMPTY_ORDERED_ITERATOR.hasPrevious());
        ((ResettableIterator) IteratorUtils.EMPTY_ORDERED_ITERATOR).reset();
        assertSame(IteratorUtils.EMPTY_ORDERED_ITERATOR, IteratorUtils.EMPTY_ORDERED_ITERATOR);
        assertSame(IteratorUtils.EMPTY_ORDERED_ITERATOR, IteratorUtils.emptyOrderedIterator());
        try {
            IteratorUtils.EMPTY_ORDERED_ITERATOR.next();
            fail();
        } catch (NoSuchElementException ex) {}
        try {
            IteratorUtils.EMPTY_ORDERED_ITERATOR.previous();
            fail();
        } catch (NoSuchElementException ex) {}
        try {
            IteratorUtils.EMPTY_ORDERED_ITERATOR.remove();
            fail();
        } catch (IllegalStateException ex) {}
    }
    
    //-----------------------------------------------------------------------
    /**
     * Test empty map iterator
     */
    public void testEmptyOrderedMapIterator() {
        assertSame(EmptyOrderedMapIterator.INSTANCE, IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR);
        assertEquals(true, IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR instanceof Iterator);
        assertEquals(true, IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR instanceof MapIterator);
        assertEquals(true, IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR instanceof OrderedMapIterator);
        assertEquals(true, IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR instanceof ResettableIterator);
        assertEquals(false, IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR instanceof ListIterator);
        assertEquals(false, IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR.hasNext());
        assertEquals(false, IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR.hasPrevious());
        ((ResettableIterator) IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR).reset();
        assertSame(IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR, IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR);
        assertSame(IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR, IteratorUtils.emptyOrderedMapIterator());
        try {
            IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR.next();
            fail();
        } catch (NoSuchElementException ex) {}
        try {
            IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR.previous();
            fail();
        } catch (NoSuchElementException ex) {}
        try {
            IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR.remove();
            fail();
        } catch (IllegalStateException ex) {}
        try {
            IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR.getKey();
            fail();
        } catch (IllegalStateException ex) {}
        try {
            IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR.getValue();
            fail();
        } catch (IllegalStateException ex) {}
        try {
            IteratorUtils.EMPTY_ORDERED_MAP_ITERATOR.setValue(null);
            fail();
        } catch (IllegalStateException ex) {}
    }
    
    //-----------------------------------------------------------------------
	/**
	 * Test next() and hasNext() for an immutable Iterator.
	 */
    public void testUnmodifiableIteratorIteration() {
        Iterator iterator = getImmutableIterator();

        assertTrue(iterator.hasNext());

        assertEquals("a", iterator.next());

        assertTrue(iterator.hasNext());

        assertEquals("b", iterator.next());

        assertTrue(iterator.hasNext());

        assertEquals("c", iterator.next());

        assertTrue(iterator.hasNext());

        assertEquals("d", iterator.next());

        assertTrue(!iterator.hasNext());
    }

    /**
     * Test next(), hasNext(), previous() and hasPrevious() for an immutable
     * ListIterator.
     */
    public void testUnmodifiableListIteratorIteration() {
        ListIterator listIterator = getImmutableListIterator();

        assertTrue(!listIterator.hasPrevious());
        assertTrue(listIterator.hasNext());

        assertEquals("a", listIterator.next());

        assertTrue(listIterator.hasPrevious());
        assertTrue(listIterator.hasNext());

        assertEquals("b", listIterator.next());

        assertTrue(listIterator.hasPrevious());
        assertTrue(listIterator.hasNext());

        assertEquals("c", listIterator.next());

        assertTrue(listIterator.hasPrevious());
        assertTrue(listIterator.hasNext());

        assertEquals("d", listIterator.next());

        assertTrue(listIterator.hasPrevious());
        assertTrue(!listIterator.hasNext());

        assertEquals("d", listIterator.previous());

        assertTrue(listIterator.hasPrevious());
        assertTrue(listIterator.hasNext());

        assertEquals("c", listIterator.previous());

        assertTrue(listIterator.hasPrevious());
        assertTrue(listIterator.hasNext());

        assertEquals("b", listIterator.previous());

        assertTrue(listIterator.hasPrevious());
        assertTrue(listIterator.hasNext());

        assertEquals("a", listIterator.previous());

        assertTrue(!listIterator.hasPrevious());
        assertTrue(listIterator.hasNext());
    }

    /**
     * Test remove() for an immutable Iterator.
     */
    public void testUnmodifiableIteratorImmutability() {
        Iterator iterator = getImmutableIterator();

        try {
            iterator.remove();
            // We shouldn't get to here.
            fail("remove() should throw an UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            // This is correct; ignore the exception.
        }

        iterator.next();

        try {
            iterator.remove();
            // We shouldn't get to here.
            fail("remove() should throw an UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            // This is correct; ignore the exception.
        }

    }

    /**
     * Test remove() for an immutable ListIterator.
     */
    public void testUnmodifiableListIteratorImmutability() {
    	ListIterator listIterator = getImmutableListIterator();

        try {
            listIterator.remove();
            // We shouldn't get to here.
            fail("remove() should throw an UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            // This is correct; ignore the exception.
        }

        try {
            listIterator.set("a");
            // We shouldn't get to here.
            fail("set(Object) should throw an UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            // This is correct; ignore the exception.
        }

        try {
            listIterator.add("a");
            // We shouldn't get to here.
            fail("add(Object) should throw an UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            // This is correct; ignore the exception.
        }

        listIterator.next();

        try {
            listIterator.remove();
            // We shouldn't get to here.
            fail("remove() should throw an UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            // This is correct; ignore the exception.
        }

        try {
            listIterator.set("a");
            // We shouldn't get to here.
            fail("set(Object) should throw an UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            // This is correct; ignore the exception.
        }

        try {
            listIterator.add("a");
            // We shouldn't get to here.
            fail("add(Object) should throw an UnsupportedOperationException");
        } catch (UnsupportedOperationException e) {
            // This is correct; ignore the exception.
        }
    }
}

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