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diff --git a/OpenSim/Region/ScriptEngine/Shared/Tests/OSSL_ApiNpcTests.cs b/OpenSim/Region/ScriptEngine/Shared/Tests/OSSL_ApiNpcTests.cs
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+++ b/OpenSim/Region/ScriptEngine/Shared/Tests/OSSL_ApiNpcTests.cs
@@ -0,0 +1,170 @@
+/*
+ * 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.Collections.Generic;
+using System.Reflection;
+using System.Text;
+using log4net;
+using Nini.Config;
+using NUnit.Framework;
+using OpenMetaverse;
+using OpenMetaverse.Assets;
+using OpenMetaverse.StructuredData;
+using OpenSim.Framework;
+using OpenSim.Region.CoreModules.Avatar.AvatarFactory;
+using OpenSim.Region.OptionalModules.World.NPC;
+using OpenSim.Region.Framework.Scenes;
+using OpenSim.Region.ScriptEngine.Shared;
+using OpenSim.Region.ScriptEngine.Shared.Api;
+using OpenSim.Region.ScriptEngine.Shared.ScriptBase;
+using OpenSim.Services.Interfaces;
+using OpenSim.Tests.Common;
+using OpenSim.Tests.Common.Mock;
+
+namespace OpenSim.Region.ScriptEngine.Shared.Tests
+{
+    /// <summary>
+    /// Tests for OSSL NPC API
+    /// </summary>
+    [TestFixture]
+    public class OSSL_NpcApiAppearanceTest
+    {
+        protected Scene m_scene;
+        protected XEngine.XEngine m_engine;
+
+        [SetUp]
+        public void SetUp()
+        {
+            IConfigSource initConfigSource = new IniConfigSource();
+            IConfig config = initConfigSource.AddConfig("XEngine");
+            config.Set("Enabled", "true");
+            config.Set("AllowOSFunctions", "true");
+            config.Set("OSFunctionThreatLevel", "Severe");
+            config = initConfigSource.AddConfig("NPC");
+            config.Set("Enabled", "true");
+
+            m_scene = SceneHelpers.SetupScene();
+            SceneHelpers.SetupSceneModules(m_scene, initConfigSource, new AvatarFactoryModule(), new NPCModule());
+
+            m_engine = new XEngine.XEngine();
+            m_engine.Initialise(initConfigSource);
+            m_engine.AddRegion(m_scene);
+        }
+
+        /// <summary>
+        /// Test removal of an owned NPC.
+        /// </summary>
+        [Test]
+        public void TestOsNpcRemoveOwned()
+        {
+            TestHelpers.InMethod();
+//            log4net.Config.XmlConfigurator.Configure();
+
+            // Store an avatar with a different height from default in a notecard.
+            UUID userId = TestHelpers.ParseTail(0x1);
+            UUID otherUserId = TestHelpers.ParseTail(0x2);
+            float newHeight = 1.9f;
+
+            SceneHelpers.AddScenePresence(m_scene, otherUserId);
+
+            ScenePresence sp = SceneHelpers.AddScenePresence(m_scene, userId);
+            sp.Appearance.AvatarHeight = newHeight;
+
+            SceneObjectGroup so = SceneHelpers.CreateSceneObject(1, userId);
+            SceneObjectPart part = so.RootPart;
+            m_scene.AddSceneObject(so);
+
+            SceneObjectGroup otherSo = SceneHelpers.CreateSceneObject(1, otherUserId);
+            SceneObjectPart otherPart = otherSo.RootPart;
+            m_scene.AddSceneObject(otherSo);
+
+            OSSL_Api osslApi = new OSSL_Api();
+            osslApi.Initialize(m_engine, part, part.LocalId, part.UUID);
+
+            OSSL_Api otherOsslApi = new OSSL_Api();
+            otherOsslApi.Initialize(m_engine, otherPart, otherPart.LocalId, otherPart.UUID);
+
+            string notecardName = "appearanceNc";
+            osslApi.osOwnerSaveAppearance(notecardName);
+
+            string npcRaw
+                = osslApi.osNpcCreate(
+                    "Jane", "Doe", new LSL_Types.Vector3(128, 128, 128), notecardName, ScriptBaseClass.OS_NPC_CREATOR_OWNED);
+            
+            otherOsslApi.osNpcRemove(npcRaw);
+
+            // Should still be around
+            UUID npcId = new UUID(npcRaw);
+            ScenePresence npc = m_scene.GetScenePresence(npcId);
+            Assert.That(npc, Is.Not.Null);
+
+            osslApi.osNpcRemove(npcRaw);
+
+            npc = m_scene.GetScenePresence(npcId);
+
+            // Now the owner deleted it and it's gone
+            Assert.That(npc, Is.Null);
+        }
+
+        /// <summary>
+        /// Test removal of an unowned NPC.
+        /// </summary>
+        [Test]
+        public void TestOsNpcRemoveUnowned()
+        {
+            TestHelpers.InMethod();
+//            log4net.Config.XmlConfigurator.Configure();
+
+            // Store an avatar with a different height from default in a notecard.
+            UUID userId = TestHelpers.ParseTail(0x1);
+            float newHeight = 1.9f;
+
+            ScenePresence sp = SceneHelpers.AddScenePresence(m_scene, userId);
+            sp.Appearance.AvatarHeight = newHeight;
+            SceneObjectGroup so = SceneHelpers.CreateSceneObject(1, userId);
+            SceneObjectPart part = so.RootPart;
+            m_scene.AddSceneObject(so);
+
+            OSSL_Api osslApi = new OSSL_Api();
+            osslApi.Initialize(m_engine, part, part.LocalId, part.UUID);
+
+            string notecardName = "appearanceNc";
+            osslApi.osOwnerSaveAppearance(notecardName);
+
+            string npcRaw
+                = osslApi.osNpcCreate(
+                    "Jane", "Doe", new LSL_Types.Vector3(128, 128, 128), notecardName, ScriptBaseClass.OS_NPC_NOT_OWNED);
+            
+            osslApi.osNpcRemove(npcRaw);
+
+            UUID npcId = new UUID(npcRaw);
+            ScenePresence npc = m_scene.GetScenePresence(npcId);
+            Assert.That(npc, Is.Null);
+        }
+    }
+}
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