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diff --git a/OpenSim/Region/Framework/Scenes/Tests/SceneObjectUndoRedoTests.cs b/OpenSim/Region/Framework/Scenes/Tests/SceneObjectUndoRedoTests.cs
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+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Reflection;
+using NUnit.Framework;
+using OpenMetaverse;
+using OpenSim.Framework;
+using OpenSim.Framework.Communications;
+using OpenSim.Region.Framework.Scenes;
+using OpenSim.Tests.Common;
+
+namespace OpenSim.Region.Framework.Scenes.Tests
+{
+    /// <summary>
+    /// Tests for undo/redo
+    /// </summary>
+    public class SceneObjectUndoRedoTests : OpenSimTestCase
+    {
+        [Test]
+        public void TestUndoRedoResizeSceneObject()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            Vector3 firstSize = new Vector3(2, 3, 4);
+            Vector3 secondSize = new Vector3(5, 6, 7);
+
+            Scene scene = new SceneHelpers().SetupScene();
+            scene.MaxUndoCount = 20;
+            SceneObjectGroup g1 = SceneHelpers.AddSceneObject(scene);
+
+            // TODO: It happens to be the case that we are not storing undo states for SOPs which are not yet in a SOG,
+            // which is the way that AddSceneObject() sets up the object (i.e. it creates the SOP first).  However,
+            // this is somewhat by chance.  Really, we shouldn't be storing undo states at all if the object is not
+            // in a scene.
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(0));
+
+            g1.GroupResize(firstSize);
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(1));
+
+            g1.GroupResize(secondSize);
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(2));
+
+            g1.RootPart.Undo();
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(1));
+            Assert.That(g1.GroupScale, Is.EqualTo(firstSize));
+
+            g1.RootPart.Redo();
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(2));
+            Assert.That(g1.GroupScale, Is.EqualTo(secondSize));
+        }
+
+        [Test]
+        public void TestUndoLimit()
+        {
+            TestHelpers.InMethod();
+
+            Vector3 firstSize = new Vector3(2, 3, 4);
+            Vector3 secondSize = new Vector3(5, 6, 7);
+            Vector3 thirdSize = new Vector3(8, 9, 10);
+            Vector3 fourthSize = new Vector3(11, 12, 13);
+
+            Scene scene = new SceneHelpers().SetupScene();
+            scene.MaxUndoCount = 2;
+            SceneObjectGroup g1 = SceneHelpers.AddSceneObject(scene);
+
+            g1.GroupResize(firstSize);
+            g1.GroupResize(secondSize);
+            g1.GroupResize(thirdSize);
+            g1.GroupResize(fourthSize);
+
+            g1.RootPart.Undo();
+            g1.RootPart.Undo();
+            g1.RootPart.Undo();
+
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(0));
+            Assert.That(g1.GroupScale, Is.EqualTo(secondSize));
+        }
+
+        [Test]
+        public void TestNoUndoOnObjectsNotInScene()
+        {
+            TestHelpers.InMethod();
+
+            Vector3 firstSize = new Vector3(2, 3, 4);
+            Vector3 secondSize = new Vector3(5, 6, 7);
+//            Vector3 thirdSize = new Vector3(8, 9, 10);
+//            Vector3 fourthSize = new Vector3(11, 12, 13);
+
+            Scene scene = new SceneHelpers().SetupScene();
+            scene.MaxUndoCount = 20;
+            SceneObjectGroup g1 = SceneHelpers.CreateSceneObject(1, TestHelpers.ParseTail(0x1));
+
+            g1.GroupResize(firstSize);
+            g1.GroupResize(secondSize);
+
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(0));
+
+            g1.RootPart.Undo();
+
+            Assert.That(g1.GroupScale, Is.EqualTo(secondSize));
+        }
+
+        [Test]
+        public void TestUndoBeyondAvailable()
+        {
+            TestHelpers.InMethod();
+
+            Vector3 newSize = new Vector3(2, 3, 4);
+
+            Scene scene = new SceneHelpers().SetupScene();
+            scene.MaxUndoCount = 20;
+            SceneObjectGroup g1 = SceneHelpers.AddSceneObject(scene);
+            Vector3 originalSize = g1.GroupScale;
+
+            g1.RootPart.Undo();
+
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(0));
+            Assert.That(g1.GroupScale, Is.EqualTo(originalSize));
+
+            g1.GroupResize(newSize);
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(1));
+            Assert.That(g1.GroupScale, Is.EqualTo(newSize));
+
+            g1.RootPart.Undo();
+            g1.RootPart.Undo();
+
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(0));
+            Assert.That(g1.GroupScale, Is.EqualTo(originalSize));
+        }
+
+        [Test]
+        public void TestRedoBeyondAvailable()
+        {
+            TestHelpers.InMethod();
+
+            Vector3 newSize = new Vector3(2, 3, 4);
+
+            Scene scene = new SceneHelpers().SetupScene();
+            scene.MaxUndoCount = 20;
+            SceneObjectGroup g1 = SceneHelpers.AddSceneObject(scene);
+            Vector3 originalSize = g1.GroupScale;
+
+            g1.RootPart.Redo();
+
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(0));
+            Assert.That(g1.GroupScale, Is.EqualTo(originalSize));
+
+            g1.GroupResize(newSize);
+            g1.RootPart.Undo();
+            g1.RootPart.Redo();
+            g1.RootPart.Redo();
+
+            Assert.That(g1.RootPart.UndoCount, Is.EqualTo(1));
+            Assert.That(g1.GroupScale, Is.EqualTo(newSize));
+        }
+    }
+}
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