test: Fix analysis warnings for unused classes

src/Trash.Tests/Command/Helpers/CliTypeActivatorTest.cs

@@ -1,4 +1,5 @@
-using Autofac;
+using System.Diagnostics.CodeAnalysis;
+using Autofac;
 using FluentAssertions;
 using NUnit.Framework;
 using Trash.Command;
@@ -10,10 +11,14 @@ namespace Trash.Tests.Command.Helpers;
 [Parallelizable(ParallelScope.All)]
 public class CliTypeActivatorTest
 {
+    // Warning CA1812 : an internal class that is apparently never instantiated.
+    [SuppressMessage("Performance", "CA1812", Justification = "Registered to and created by Autofac")]
     private class NonServiceCommandType
     {
     }
 
+    // Warning CA1812 : an internal class that is apparently never instantiated.
+    [SuppressMessage("Performance", "CA1812", Justification = "Registered to and created by Autofac")]
     private class StubCommand : IServiceCommand
     {
         public bool Preview => false;

src/Trash.Tests/CompositionRootTest.cs

@@ -1,4 +1,5 @@
 using System.Collections;
+using System.Diagnostics.CodeAnalysis;
 using Autofac;
 using Autofac.Core;
 using FluentAssertions;
@@ -39,6 +40,11 @@ public class CompositionRootTest
         act.Should().NotThrow();
     }
 
+    // Warning CA1812 : CompositionRootTest.ConcreteTypeEnumerator is an internal class that is apparently never
+    // instantiated.
+    [SuppressMessage("Performance", "CA1812",
+        Justification = "Created via reflection by TestCaseSource attribute"
+    )]
     private sealed class ConcreteTypeEnumerator : IEnumerable
     {
         private readonly IContainer _container;