Add unit tests for trimming annotations

Author: Sergio0694

tests/CommunityToolkit.Mvvm.UnitTests/Test_ObservableRecipient.cs

@@ -3,11 +3,18 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+#if !NET6_0_OR_GREATER
+using System.Collections.Generic;
+using System.Linq;
+#endif
+using System.Reflection;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Messaging;
 using CommunityToolkit.Mvvm.Messaging.Messages;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
+#pragma warning disable CS0618
+
 namespace CommunityToolkit.Mvvm.UnitTests;
 
 [TestClass]
@@ -85,6 +92,23 @@ public void Test_ObservableRecipient_Broadcast(Type type)
         Assert.AreEqual(message.PropertyName, nameof(SomeRecipient<int>.Data));
     }
 
+    [TestMethod]
+    public void Test_IRecipient_VerifyTrimmingAnnotation()
+    {
+#if NET6_0_OR_GREATER
+        System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute? attribute =
+            typeof(Messaging.__Internals.__IMessengerExtensions)
+            .GetCustomAttribute<System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute>();
+
+        Assert.IsNotNull(attribute);
+        Assert.AreEqual(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicMethods, attribute.MemberTypes);
+#else
+        IEnumerable<Attribute> attributes = typeof(Messaging.__Internals.__IMessengerExtensions).GetCustomAttributes();
+
+        Assert.IsFalse(attributes.Any(static a => a.GetType().Name is "DynamicallyAccessedMembersAttribute"));
+#endif
+    }
+
     public class SomeRecipient<T> : ObservableRecipient
     {
         public SomeRecipient()

tests/CommunityToolkit.Mvvm.UnitTests/Test_ObservableValidator.cs

@@ -12,6 +12,8 @@
 using CommunityToolkit.Mvvm.ComponentModel;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
+#pragma warning disable CS0618
+
 namespace CommunityToolkit.Mvvm.UnitTests;
 
 [TestClass]
@@ -477,6 +479,23 @@ public void Test_ObservableRecipient_ValidationOnNonValidatableProperties_WithFa
         validationFunc(viewmodel.GetType())(viewmodel);
     }
 
+    [TestMethod]
+    public void Test_ObservableValidator_VerifyTrimmingAnnotation()
+    {
+#if NET6_0_OR_GREATER
+        System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute? attribute =
+            typeof(ComponentModel.__Internals.__ObservableValidatorExtensions)
+            .GetCustomAttribute<System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute>();
+
+        Assert.IsNotNull(attribute);
+        Assert.AreEqual(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicMethods, attribute.MemberTypes);
+#else
+        IEnumerable<Attribute> attributes = typeof(ComponentModel.__Internals.__ObservableValidatorExtensions).GetCustomAttributes();
+
+        Assert.IsFalse(attributes.Any(static a => a.GetType().Name is "DynamicallyAccessedMembersAttribute"));
+#endif
+    }
+
     public class Person : ObservableValidator
     {
         private string? name;