[Core] Add tests to improve coverage

Author: Kryptos-FR

sources/core/Stride.Core.Tests/AnonymousDisposableTests.cs

@@ -0,0 +1,60 @@
+// Copyright (c) .NET Foundation and Contributors (https://dotnetfoundation.org/ & https://stride3d.net)
+// Distributed under the MIT license. See the LICENSE.md file in the project root for more information.
+
+using Xunit;
+
+namespace Stride.Core.Tests;
+
+public class AnonymousDisposableTests
+{
+    [Fact]
+    public void Constructor_WithNullAction_ThrowsArgumentNullException()
+    {
+        Assert.Throws<ArgumentNullException>(() => new AnonymousDisposable(null!));
+    }
+
+    [Fact]
+    public void Dispose_InvokesAction()
+    {
+        var disposed = false;
+        var disposable = new AnonymousDisposable(() => disposed = true);
+
+        disposable.Dispose();
+
+        Assert.True(disposed);
+    }
+
+    [Fact]
+    public void Dispose_CalledMultipleTimes_InvokesActionOnlyOnce()
+    {
+        var disposeCount = 0;
+        var disposable = new AnonymousDisposable(() => disposeCount++);
+
+        disposable.Dispose();
+        disposable.Dispose();
+        disposable.Dispose();
+
+        Assert.Equal(1, disposeCount);
+    }
+
+    [Fact]
+    public void Dispose_WithExceptionInAction_PropagatesException()
+    {
+        var disposable = new AnonymousDisposable(() => throw new InvalidOperationException("Test exception"));
+
+        Assert.Throws<InvalidOperationException>(() => disposable.Dispose());
+    }
+
+    [Fact]
+    public void Dispose_WithUsingStatement_InvokesAction()
+    {
+        var disposed = false;
+
+        using (new AnonymousDisposable(() => disposed = true))
+        {
+            Assert.False(disposed);
+        }
+
+        Assert.True(disposed);
+    }
+}