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* $Id: WeakEventListenerListTest.java 3473 2009-08-27 13:17:10Z kleopatra $
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* Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
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* Santa Clara, California 95054, U.S.A. All rights reserved.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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package org.jdesktop.swingx.event;
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import javax.swing.event.ChangeListener;
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import junit.framework.TestCase;
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import org.jdesktop.test.ChangeReport;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.junit.runners.JUnit4;
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* Unit tests for SwingX' EventListenerList. Testing the
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* mechanics of mutations and returned listener arrays. <p>
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* PENDING: any way to unit test memory leaks?
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* @author Jeanette Winzenburg
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@RunWith(JUnit4.class)
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public class WeakEventListenerListTest extends TestCase {
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* Test intial getListenerList
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public void testGetListenerListInitial() {
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WeakEventListenerList list = new WeakEventListenerList();
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// must return empty array
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assertNotNull("array must be not null", list.getListenerList());
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assertEquals("array must be empty", 0, list.getListenerList().length);
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* test sequence in array.
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public void testGetListenerListAddRemove() {
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WeakEventListenerList list = new WeakEventListenerList();
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// add one changeListener
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ChangeReport changeReport = new ChangeReport();
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list.add(ChangeListener.class, changeReport);
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Object[] array = list.getListenerList();
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assertEquals("array must have 2 elements", 2, array.length);
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assertSame("listener class must be at 0", ChangeListener.class, array[0]);
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assertSame("added listener must be at 1", changeReport, array[1]);
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ChangeReport otherReport = new ChangeReport();
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list.add(ChangeListener.class, otherReport);
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Object[] otherArray = list.getListenerList();
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assertEquals("array must have 4 elements", 4, otherArray.length);
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assertSame(ChangeListener.class, otherArray[0]);
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assertSame(changeReport, otherArray[1]);
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assertSame(ChangeListener.class, otherArray[2]);
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assertSame(otherReport, otherArray[3]);
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list.remove(ChangeListener.class, changeReport);
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Object[] removedArray = list.getListenerList();
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assertEquals("array must have 2 elements", 2, removedArray.length);
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assertSame("listener class must be at 0", ChangeListener.class, removedArray[0]);
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assertSame("added listener must be at 1", otherReport, removedArray[1]);
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public void testGetListenersInitial() {
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WeakEventListenerList list = new WeakEventListenerList();
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// must return empty array
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assertNotNull("array must be not null", list.getListeners(ChangeListener.class));
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assertEquals("array must be empty", 0, list.getListeners(ChangeListener.class).length);
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* test sequence in array.
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public void testGetListenersAddRemove() {
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WeakEventListenerList list = new WeakEventListenerList();
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// add one changeListener
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ChangeReport changeReport = new ChangeReport();
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list.add(ChangeListener.class, changeReport);
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ChangeListener[] array = list.getListeners(ChangeListener.class);
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assertEquals("array must have 2 elements", 1, array.length);
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assertSame("added listener must be at 0", changeReport, array[0]);
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ChangeReport otherReport = new ChangeReport();
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list.add(ChangeListener.class, otherReport);
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ChangeListener[] otherArray = list.getListeners(ChangeListener.class);
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assertEquals("array must have 2 elements", 2, otherArray.length);
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assertSame(changeReport, otherArray[0]);
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assertSame(otherReport, otherArray[1]);
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list.remove(ChangeListener.class, changeReport);
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ChangeListener[] removedArray = list.getListeners(ChangeListener.class);
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assertEquals("array length", 1, removedArray.length);
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assertSame("last added listener must be at 0", otherReport, removedArray[0]);