Index: /trunk/quest-core-events-test/src/test/java/de/ugoe/cs/quest/eventcore/guimodel/AbstractDefaultGUIElementTest.java
===================================================================
--- /trunk/quest-core-events-test/src/test/java/de/ugoe/cs/quest/eventcore/guimodel/AbstractDefaultGUIElementTest.java	(revision 615)
+++ /trunk/quest-core-events-test/src/test/java/de/ugoe/cs/quest/eventcore/guimodel/AbstractDefaultGUIElementTest.java	(revision 615)
@@ -0,0 +1,132 @@
+// Module    : $RCSfile: AbstractDefaultGUIElementTest.java,v $
+// Version   : $Revision: 0.0 $  $Author: pharms $  $Date: 24.08.2012 $
+// Project   : quest-core-events-test
+// Creation  : 2012 by pharms
+// Copyright : Patrick Harms, 2012
+package de.ugoe.cs.quest.eventcore.guimodel;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+/**
+ * <p>
+ * TODO comment
+ * </p>
+ * 
+ * @version $Revision: $ $Date: 24.08.2012$
+ * @author 2012, last modified by $Author: pharms$
+ */
+public class AbstractDefaultGUIElementTest {
+
+    /**
+     * <p>
+     * TODO: comment
+     * </p>
+     */
+    @Test
+    public void testRegisteringEqualGuiElements() {
+        IGUIElement guiElement1 = new AbstractDefaultGUIElementTestImpl();
+        IGUIElement guiElement2 = new AbstractDefaultGUIElementTestImpl();
+        
+        assertCompletelyUnequal(guiElement1, guiElement2);
+        
+        guiElement1.addEqualGUIElement(guiElement2);
+        assertCompletelyEqual(guiElement1, guiElement2);
+        
+        IGUIElement guiElement3 = new AbstractDefaultGUIElementTestImpl();
+        
+        assertCompletelyEqual(guiElement1, guiElement2);
+        assertCompletelyUnequal(guiElement1, guiElement3);
+        assertCompletelyUnequal(guiElement2, guiElement3);
+        
+        guiElement1.addEqualGUIElement(guiElement3);
+        assertCompletelyEqual(guiElement1, guiElement2, guiElement3);
+
+        IGUIElement guiElement4 = new AbstractDefaultGUIElementTestImpl();
+        
+        assertCompletelyEqual(guiElement1, guiElement2, guiElement3);
+        assertCompletelyUnequal(guiElement1, guiElement4);
+        assertCompletelyUnequal(guiElement2, guiElement4);
+        assertCompletelyUnequal(guiElement3, guiElement4);
+        
+        guiElement3.addEqualGUIElement(guiElement4);
+        assertCompletelyEqual(guiElement1, guiElement2, guiElement3, guiElement4);
+    }
+    
+    /**
+     * <p>
+     * 
+     * </p>
+     */
+    private void assertCompletelyUnequal(IGUIElement... guiElements) {
+        for (int i = 0; i < guiElements.length; i++) {
+            for (int j = i + 1; j < guiElements.length; j++) {
+                assertFalse(guiElements[i].equals(guiElements[j]));
+                assertFalse(guiElements[j].equals(guiElements[i]));
+                assertNotSame(guiElements[i].hashCode(), guiElements[j].hashCode());
+            }
+        }
+    }
+
+    /**
+     * <p>
+     * 
+     * </p>
+     */
+    private void assertCompletelyEqual(IGUIElement... guiElements) {
+        for (int i = 0; i < guiElements.length; i++) {
+            for (int j = i; j < guiElements.length; j++) {
+                assertTrue(guiElements[i].equals(guiElements[j]));
+                assertTrue(guiElements[j].equals(guiElements[i]));
+                assertEquals(guiElements[i].hashCode(), guiElements[j].hashCode());
+            }
+        }
+    }
+
+    /**
+     * <p>
+     * TODO comment
+     * </p>
+     * 
+     * @version $Revision: $ $Date: 24.08.2012$
+     * @author 2012, last modified by $Author: pharms$
+     */
+    public class AbstractDefaultGUIElementTestImpl extends AbstractDefaultGUIElement
+        implements IGUIElement
+    {
+
+        /**
+         * <p>
+         * TODO: comment
+         * </p>
+         *
+         * @param specification
+         * @param parent
+         */
+        public AbstractDefaultGUIElementTestImpl() {
+            super(null, null);
+        }
+
+        /**  */
+        private static final long serialVersionUID = 1L;
+
+        /* (non-Javadoc)
+         * @see de.ugoe.cs.quest.eventcore.IEventTarget#getPlatform()
+         */
+        @Override
+        public String getPlatform() {
+            return "TEST";
+        }
+
+        /* (non-Javadoc)
+         * @see de.ugoe.cs.quest.eventcore.guimodel.IGUIElement#updateSpecification(de.ugoe.cs.quest.eventcore.guimodel.IGUIElementSpec)
+         */
+        @Override
+        public void updateSpecification(IGUIElementSpec furtherSpec) {
+            throw new UnsupportedOperationException();
+        }
+
+    }
+
+}