1 /*
   2  * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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  23  * questions.
  24  */
  25 
  26 package javafx.collections;
  27 
  28 import com.sun.javafx.collections.NonIterableChange;
  29 import com.sun.javafx.collections.ObservableListWrapper;
  30 import org.junit.Test;
  31 
  32 import java.util.ArrayList;
  33 import java.util.Collections;
  34 
  35 import static org.junit.Assert.*;
  36 
  37 public class WeakListChangeListenerTest {
  38         
  39     @Test(expected=NullPointerException.class)
  40     public void testConstructWithNull() {
  41         new WeakListChangeListener<Object>(null);
  42     }
  43 
  44     @Test
  45     public void testHandle() {
  46         MockListObserver<Object> listener = new MockListObserver<Object>();
  47         final WeakListChangeListener<Object> weakListener = new WeakListChangeListener<Object>(listener);
  48         final ObservableListWrapper<Object> list = new ObservableListWrapper<Object>(new ArrayList<Object>());
  49         final Object removedElement = new Object();
  50         final ListChangeListener.Change<Object> change = new NonIterableChange.SimpleRemovedChange<Object>(0, 1, removedElement, list);
  51 
  52         // regular call
  53         weakListener.onChanged(change);
  54         listener.check1AddRemove(list, Collections.singletonList(removedElement), 0, 1);
  55         assertFalse(weakListener.wasGarbageCollected());
  56 
  57         // GC-ed call
  58         listener = null;
  59         System.gc();
  60         assertTrue(weakListener.wasGarbageCollected());
  61         weakListener.onChanged(change);
  62 
  63     }
  64 
  65 }