Add LLImageManager regression test for discard case

OpenSim/Region/ClientStack/Linden/UDP/Tests/LLImageManagerTests.cs

@@ -88,5 +88,58 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
 
             Assert.That(tc.SentImageDataPackets.Count, Is.EqualTo(1));
         }
+
+        [Test]
+        public void TestRequestAndDiscardImage()
+        {
+            TestHelpers.InMethod();
+//            XmlConfigurator.Configure();
+
+            UUID imageId = TestHelpers.ParseTail(0x1);
+            string creatorId = TestHelpers.ParseTail(0x2).ToString();
+            UUID userId = TestHelpers.ParseTail(0x3);
+
+            J2KDecoderModule j2kdm = new J2KDecoderModule();
+
+            Scene scene = SceneHelpers.SetupScene();
+            SceneHelpers.SetupSceneModules(scene, j2kdm);
+
+            TestClient tc = new TestClient(SceneHelpers.GenerateAgentData(userId), scene);
+            LLImageManager llim = new LLImageManager(tc, scene.AssetService, j2kdm);
+
+            using (
+                Stream resource
+                    = GetType().Assembly.GetManifestResourceStream(
+                        "OpenSim.Region.ClientStack.LindenUDP.Tests.Resources.4-tile2.jp2"))
+            {
+                using (BinaryReader br = new BinaryReader(resource))
+                {
+                    AssetBase asset = new AssetBase(imageId, "Test Image", (sbyte)AssetType.Texture, creatorId);
+                    asset.Data = br.ReadBytes(99999999);
+                    scene.AssetService.Store(asset);
+                }
+            }
+
+            TextureRequestArgs args = new TextureRequestArgs();
+            args.RequestedAssetID = imageId;
+            args.DiscardLevel = 0;
+            args.PacketNumber = 1;
+            args.Priority = 5;
+            args.requestSequence = 1;
+            llim.EnqueueReq(args);
+
+            // Now create a discard request
+            TextureRequestArgs discardArgs = new TextureRequestArgs();
+            discardArgs.RequestedAssetID = imageId;
+            discardArgs.DiscardLevel = -1;
+            discardArgs.PacketNumber = 1;
+            discardArgs.Priority = 0;
+            discardArgs.requestSequence = 2;
+            llim.EnqueueReq(discardArgs);
+
+            llim.ProcessImageQueue(20);
+
+            Assert.That(tc.SentImageDataPackets.Count, Is.EqualTo(0));
+        }
     }
 }