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diff --git a/docs/teaching/exercises/tests/Test4d.java b/docs/teaching/exercises/tests/Test4d.java
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+++ b/docs/teaching/exercises/tests/Test4d.java
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+/* *******************************************************************
+ * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
+ * All rights reserved. 
+ * This program and the accompanying materials are made available 
+ * under the terms of the Common Public License v1.0 
+ * which accompanies this distribution and is available at 
+ * http://www.eclipse.org/legal/cpl-v10.html 
+ *  
+ * Contributors: 
+ *     PARC     initial implementation 
+ * ******************************************************************/
+
+package tests;
+
+import figures.*;
+import java.awt.Rectangle;
+
+import junit.framework.*;
+
+public class Test4d extends Test {
+
+    public Test4d(String name) { super(name); }
+
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(Test4d.class);
+    }
+
+    public void setUp() {
+        super.setUp();
+    }
+
+    public void testBasicEquality() {
+	assertTrue(g.getBounds() == g.getBounds());
+    }
+
+    public void testNonGroupMove() {
+	p1.move(3, 27);
+    }
+
+    public void testEqualityAfterAddition() {
+	Rectangle r = g.getBounds();
+	g.add(new Point(37, 90));
+	assertTrue(g.getBounds() == r);
+    }
+
+    public void testEqualityAfterMove() {
+	Point p0 = new Point(1, 2);
+	Point p1 = new Point(2, 3);
+
+	Group g0 = new Group(p0);
+	Group g1 = new Group(p1);
+
+	Rectangle r0 = g0.getBounds();
+	Rectangle r1 = g1.getBounds();
+	assertTrue(r0 != r1);
+	assertTrue(g0.getBounds() == r0);
+	assertTrue(g1.getBounds() != r0);
+	assertTrue(g0.getBounds() != r1);
+	assertTrue(g1.getBounds() == r1);
+
+	p0.move(3, 1);
+	Rectangle r00 = g0.getBounds();
+	Rectangle r10 = g1.getBounds();
+
+	assertTrue(r10 != r00);
+	assertTrue(r0 != r00);
+	assertTrue(g0.getBounds() == r00);
+    }
+
+    public void testEqualityAfterMove0() {
+	g = new Group(p1);
+	Rectangle r0 = g.getBounds();
+	assertTrue(g.getBounds() == r0);
+	p1.move(3, 1);
+	Rectangle r1 = g.getBounds();
+	assertTrue(r0 != r1);
+	assertTrue(r1 == g.getBounds());
+    }
+}
+
+