Added another test to the IsolatedUnitTest.

Author: dlemstra

tests/Magick.NET.Tests/Coders/ThePdfCoder.cs

@@ -4,49 +4,55 @@
 using System.Threading.Tasks;
 using ImageMagick;
 using Xunit;
-using Xunit.Sdk;
 
 namespace Magick.NET.Tests;
 
+[Collection(nameof(IsolatedUnitTest))]
 public partial class ThePdfCoder
 {
     [Fact]
     public async Task ShouldReadFileMultithreadedCorrectly()
     {
         Assert.SkipUnless(Ghostscript.IsAvailable, "Ghostscript is not available");
 
-        var results = new Task[3];
-
-        for (var i = 0; i < results.Length; ++i)
+        await IsolatedUnitTest.Execute(static async () =>
         {
-            results[i] = Task.Run(
-                () =>
-                {
-                    using var image = new MagickImage();
-                    image.Read(Files.Coders.CartoonNetworkStudiosLogoAI);
-
-                    Assert.Equal(765U, image.Width);
-                    Assert.Equal(361U, image.Height);
-                    Assert.Equal(MagickFormat.Ai, image.Format);
-                },
-                TestContext.Current.CancellationToken);
+            var results = new Task[3];
+
+            for (var i = 0; i < results.Length; ++i)
+            {
+                results[i] = Task.Run(
+                    () =>
+                    {
+                        using var image = new MagickImage();
+                        image.Read(Files.Coders.CartoonNetworkStudiosLogoAI);
+
+                        Assert.Equal(765U, image.Width);
+                        Assert.Equal(361U, image.Height);
+                        Assert.Equal(MagickFormat.Ai, image.Format);
+                    },
+                    TestContext.Current.CancellationToken);
             }
 
-        for (var i = 0; i < results.Length; ++i)
-        {
-            await results[i];
-        }
+            for (var i = 0; i < results.Length; ++i)
+            {
+                await results[i];
+            }
+        });
     }
 
     [Fact]
     public void ShouldReturnTheCorrectFormatForAiFile()
     {
         Assert.SkipUnless(Ghostscript.IsAvailable, "Ghostscript is not available");
 
-        using var image = new MagickImage(Files.Coders.CartoonNetworkStudiosLogoAI);
+        IsolatedUnitTest.Execute(static () =>
+        {
+            using var image = new MagickImage(Files.Coders.CartoonNetworkStudiosLogoAI);
 
-        Assert.Equal(765U, image.Width);
-        Assert.Equal(361U, image.Height);
-        Assert.Equal(MagickFormat.Ai, image.Format);
+            Assert.Equal(765U, image.Width);
+            Assert.Equal(361U, image.Height);
+            Assert.Equal(MagickFormat.Ai, image.Format);
+        });
     }
 }

tests/Magick.NET.Tests/IsolatedUnitTest.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Threading;
+using System.Threading.Tasks;
 using Xunit;
 
 namespace Magick.NET.Tests;
@@ -24,4 +25,17 @@ public static void Execute(Action action)
             _semaphore.Release();
         }
     }
+
+    public static async Task Execute(Func<Task> action)
+    {
+        await _semaphore.WaitAsync();
+        try
+        {
+            await action();
+        }
+        finally
+        {
+            _semaphore.Release();
+        }
+    }
 }