v4.0.0 (#1357)

Source/MQTTnet.AspNetCore.Tests/ReaderExtensionsTest.cs

@@ -0,0 +1,51 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+#if NETCOREAPP3_1
+using System.Buffers;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MQTTnet.AspNetCore;
+using MQTTnet.Formatter;
+using MQTTnet.Packets;
+
+namespace MQTTnet.AspNetCore.Tests
+{
+    [TestClass]
+    public class ReaderExtensionsTest
+    {
+        [TestMethod]
+        public void TestTryDeserialize()
+        {
+            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311, new MqttBufferWriter(4096, 65535));
+
+            var buffer = serializer.Encode(new MqttPublishPacket {Topic = "a", Payload = new byte[5]}).Join();
+
+            var sequence = new ReadOnlySequence<byte>(buffer.Array, buffer.Offset, buffer.Count);
+
+            var part = sequence;
+            MqttPacket packet;
+            var consumed = part.Start;
+            var observed = part.Start;
+            var result = false;
+            var read = 0;
+            
+            part = sequence.Slice(sequence.Start, 0); // empty message should fail
+            result = serializer.TryDecode(part, out packet, out consumed, out observed, out read);
+            Assert.IsFalse(result);
+
+            part = sequence.Slice(sequence.Start, 1); // partial fixed header should fail
+            result = serializer.TryDecode(part, out packet, out consumed, out observed, out read);
+            Assert.IsFalse(result);
+
+            part = sequence.Slice(sequence.Start, 4); // partial body should fail
+            result = serializer.TryDecode(part, out packet, out consumed, out observed, out read);
+            Assert.IsFalse(result);
+
+            part = sequence; // complete msg should work
+            result = serializer.TryDecode(part, out packet, out consumed, out observed, out read);
+            Assert.IsTrue(result);
+        }
+    }
+}
+#endif