Update settings for tests project so that it will build on linux (#1860)

* Update settings for tests project so that it will build on linux

* Improve unit tests and samples

* Remove no longer required target frameworks for unit tests

* Update ci.yml

.github/workflows/ci.yml

@@ -54,7 +54,7 @@ jobs:
         uses: darenm/Setup-VSTest@v1
 
       - name: Core Tests
-        run: vstest.console.exe Source\MQTTnet.Tests\bin\Release\net6.0\MQTTnet.Tests.dll
+        run: vstest.console.exe Source\MQTTnet.Tests\bin\Release\net7.0\MQTTnet.Tests.dll
 
       - name: ASP.NET Tests
         run: vstest.console.exe Source\MQTTnet.AspNetCore.Tests\bin\Release\netcoreapp3.1\MQTTnet.AspNetCore.Tests.dll

Samples/Client/Client_Subscribe_Samples.cs

@@ -184,7 +184,7 @@ public static class Client_Subscribe_Samples
          * This sample shows how to achieve concurrent processing and not have message AutoAcknowledged
          * This to have a proper QoS1 (at-least-once) experience for what at least MQTT specification can provide
          */
-        mqttClient.ApplicationMessageReceivedAsync += async ea =>
+        mqttClient.ApplicationMessageReceivedAsync += ea =>
         {
             ea.AutoAcknowledge = false;
 
@@ -201,6 +201,8 @@ public static class Client_Subscribe_Samples
             }
 
             _ = Task.Run(ProcessAsync, shutdownToken);
+
+            return Task.CompletedTask;
         };
     }
 

Source/MQTTnet.Tests/MQTTnet.Tests.csproj

@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net452;net461;net48;netcoreapp3.1;net6.0;net7.0</TargetFrameworks>
+        <TargetFrameworks>netcoreapp3.1;net7.0</TargetFrameworks>
+        <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT' ">$(TargetFrameworks);net452;net48</TargetFrameworks>
         <IsPackable>false</IsPackable>
         <LangVersion>7.3</LangVersion>
         <EnableNETAnalyzers>false</EnableNETAnalyzers>

Source/MQTTnet.Tests/MQTTv5/Client_Tests.cs

@@ -273,7 +273,7 @@ namespace MQTTnet.Tests.MQTTv5
                 Assert.AreEqual(applicationMessage.ResponseTopic, receivedMessage.ResponseTopic);
                 Assert.AreEqual(applicationMessage.MessageExpiryInterval, receivedMessage.MessageExpiryInterval);
                 CollectionAssert.AreEqual(applicationMessage.CorrelationData, receivedMessage.CorrelationData);
-                CollectionAssert.AreEqual(applicationMessage.Payload, receivedMessage.Payload);
+                CollectionAssert.AreEqual(applicationMessage.PayloadSegment.ToArray(), receivedMessage.PayloadSegment.ToArray());
                 CollectionAssert.AreEqual(applicationMessage.UserProperties, receivedMessage.UserProperties);
             }
         }

Source/MQTTnet.Tests/MqttApplicationMessageTest.cs

@@ -1,3 +1,5 @@
+#pragma warning disable CS0618 // Type or member is obsolete
+
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
 using System.Collections.Generic;
@@ -8,7 +10,7 @@ using System.Threading.Tasks;
 namespace MQTTnet.Tests
 {
     [TestClass]
-    public class MqttApplicationMessageTest
+    public sealed class MqttApplicationMessageTest
     {
         [TestMethod]
         public void PayloadSegment()
@@ -17,32 +19,27 @@ namespace MQTTnet.Tests
             Assert.AreEqual(0, message.Payload.Length);
             Assert.AreEqual(0, message.PayloadSegment.Count);
 
-            Assert.IsTrue(object.ReferenceEquals(message.Payload, message.Payload));
+            Assert.IsTrue(ReferenceEquals(message.Payload, message.PayloadSegment.Array));
-            Assert.IsTrue(object.ReferenceEquals(message.Payload, message.PayloadSegment.Array));
 
             message.Payload = new byte[] { 1, 2 };
             Assert.AreEqual(2, message.Payload.Length);
             Assert.AreEqual(2, message.PayloadSegment.Count);
-            Assert.IsTrue(object.ReferenceEquals(message.Payload, message.Payload));
+            Assert.IsTrue(ReferenceEquals(message.Payload, message.PayloadSegment.Array));
-            Assert.IsTrue(object.ReferenceEquals(message.Payload, message.PayloadSegment.Array));
 
             message.Payload = new byte[] { 1, 2, 3 };
             Assert.AreEqual(3, message.Payload.Length);
             Assert.AreEqual(3, message.PayloadSegment.Count);
-            Assert.IsTrue(object.ReferenceEquals(message.Payload, message.Payload));
+            Assert.IsTrue(ReferenceEquals(message.Payload, message.PayloadSegment.Array));
-            Assert.IsTrue(object.ReferenceEquals(message.Payload, message.PayloadSegment.Array));
 
             message.PayloadSegment = new ArraySegment<byte>(new byte[] { 1, 2, 3 });
             Assert.AreEqual(3, message.Payload.Length);
             Assert.AreEqual(3, message.PayloadSegment.Count);
-            Assert.IsTrue(object.ReferenceEquals(message.Payload, message.Payload));
+            Assert.IsTrue(ReferenceEquals(message.Payload, message.PayloadSegment.Array));
-            Assert.IsTrue(object.ReferenceEquals(message.Payload, message.PayloadSegment.Array));
 
             message.PayloadSegment = new ArraySegment<byte>(new byte[] { 1, 2, 3 }, 1, 1);
             Assert.AreEqual(1, message.Payload.Length);
             Assert.AreEqual(1, message.PayloadSegment.Count);
-            Assert.IsTrue(object.ReferenceEquals(message.Payload, message.Payload));
+            Assert.IsFalse(ReferenceEquals(message.Payload, message.PayloadSegment.Array));
-            Assert.IsFalse(object.ReferenceEquals(message.Payload, message.PayloadSegment.Array));
         }
     }
 }

Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs

@@ -2,6 +2,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+#pragma warning disable CS0612 // Type or member is obsolete
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -37,7 +39,7 @@ namespace MQTTnet.Client
             // on the order of called methods from the builder).
             // The builder prefers the explicitly set TLS options!
             var tlsOptions = _tlsOptions ?? _tcpOptions?.TlsOptions;
-            
+
             if (_tlsParameters != null)
             {
                 if (_tlsParameters?.UseTls == true)