diff --git a/tests/ImageSharp.Tests.ProfilingSandbox/Program.cs b/tests/ImageSharp.Tests.ProfilingSandbox/Program.cs
index 161350299f..f7afa5d15b 100644
--- a/tests/ImageSharp.Tests.ProfilingSandbox/Program.cs
+++ b/tests/ImageSharp.Tests.ProfilingSandbox/Program.cs
@@ -4,6 +4,7 @@
 using SixLabors.ImageSharp.Tests.PixelFormats.PixelOperations;
 using SixLabors.ImageSharp.Tests.ProfilingBenchmarks;
 using SixLabors.ImageSharp.Tests.ProfilingSandbox;
+using Xunit;
 
 // in this file, comments are used for disabling stuff for local execution
 #pragma warning disable SA1515
@@ -31,7 +32,12 @@ static void RunToVector4ProfilingTest()
 
 sealed class ConsoleOutput : ITestOutputHelper
 {
+    public void Write(string message) => Console.Write(message);
+
+    public void Write(string format, params object[] args) => Console.Write(format, args);
+
     public void WriteLine(string message) => Console.WriteLine(message);
 
     public void WriteLine(string format, params object[] args) => Console.WriteLine(format, args);
+    public string Output { get; }
 }
diff --git a/tests/ImageSharp.Tests/Image/ImageTests.Decode_Cancellation.cs b/tests/ImageSharp.Tests/Image/ImageTests.Decode_Cancellation.cs
index cf6b2ba228..06ce7fd634 100644
--- a/tests/ImageSharp.Tests/Image/ImageTests.Decode_Cancellation.cs
+++ b/tests/ImageSharp.Tests/Image/ImageTests.Decode_Cancellation.cs
@@ -58,7 +58,7 @@ public partial class ImageTests
         public static TheoryData<bool, string, double> LoadData { get; } = CreateLoadData();
 
         // TODO: Figure out cancellation failures on Linux
-        [Theory(SkipType = typeof(TestEnvironment), SkipUnless = nameof(TestEnvironment.IsWindows))]
+        [Theory(Skip = "Skipped on non-Windows platforms", SkipType = typeof(TestEnvironment), SkipUnless = nameof(TestEnvironment.IsWindows))]
         [MemberData(nameof(LoadData))]
         public async Task LoadAsync_IsCancellable(bool useMemoryStream, string file, double percentageOfStreamReadToCancel)
         {
diff --git a/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedMemoryPoolTests.Trim.cs b/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedMemoryPoolTests.Trim.cs
index 27cf40df1b..fbb12babdf 100644
--- a/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedMemoryPoolTests.Trim.cs
+++ b/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedMemoryPoolTests.Trim.cs
@@ -57,7 +57,7 @@ public partial class UniformUnmanagedMemoryPoolTests
 
             // TODO: Investigate failures on macOS. All handles are released after GC.
             // (It seems to happen more consistently on .NET 6.)
-            [Fact(SkipUnless = nameof(IsNotMacOS))]
+            [Fact(Skip = "Skipped on macOS", SkipUnless = nameof(IsNotMacOS))]
             public void MultiplePoolInstances_TrimPeriodElapsed_AllAreTrimmed()
             {
                 if (!TestEnvironment.RunsOnCI)
diff --git a/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedMemoryPoolTests.cs b/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedMemoryPoolTests.cs
index 5489bc7e5d..3c4472bc9d 100644
--- a/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedMemoryPoolTests.cs
+++ b/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedMemoryPoolTests.cs
@@ -240,7 +240,7 @@ public partial class UniformUnmanagedMemoryPoolTests
     public static readonly bool IsNotMacOS = !TestEnvironment.IsMacOS;
 
     // TODO: Investigate macOS failures
-    [Theory(SkipUnless = nameof(IsNotMacOS))]
+    [Theory(Skip = "Skipped on macOS", SkipUnless = nameof(IsNotMacOS))]
     [InlineData(false)]
     [InlineData(true)]
     public void RentReturnRelease_SubsequentRentReturnsDifferentHandles(bool multiple)
diff --git a/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedPoolMemoryAllocatorTests.cs b/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedPoolMemoryAllocatorTests.cs
index bb0597728b..887b266856 100644
--- a/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedPoolMemoryAllocatorTests.cs
+++ b/tests/ImageSharp.Tests/Memory/Allocators/UniformUnmanagedPoolMemoryAllocatorTests.cs
@@ -584,7 +584,7 @@ public class UniformUnmanagedPoolMemoryAllocatorTests
         }
     }
 
-    [Fact(SkipType = typeof(Environment), SkipUnless = nameof(Environment.Is64BitProcess))]
+    [Fact(Skip = "Requires 64-bit process", SkipType = typeof(Environment), SkipUnless = nameof(Environment.Is64BitProcess))]
     public void MemoryAllocator_Create_SetHighLimit()
     {
         RemoteExecutor.Invoke(RunTest).Dispose();
diff --git a/tests/ImageSharp.Tests/TestUtilities/Attributes/ImageDataAttributeBase.cs b/tests/ImageSharp.Tests/TestUtilities/Attributes/ImageDataAttributeBase.cs
index 0b5fd70d90..3089c5f028 100644
--- a/tests/ImageSharp.Tests/TestUtilities/Attributes/ImageDataAttributeBase.cs
+++ b/tests/ImageSharp.Tests/TestUtilities/Attributes/ImageDataAttributeBase.cs
@@ -71,11 +71,14 @@ public abstract class ImageDataAttributeBase : DataAttribute
                 object obj = accessor();
                 if (obj is IEnumerable<object> memberItems)
                 {
-                    addedRows = memberItems.Select(x => x as object[]);
-                    if (addedRows.Any(x => x == null))
+                    // In xunit.v3, TheoryData<T...> yields ITheoryDataRow, not object[].
+                    // Call GetData() to unpack the row's values.
+                    addedRows = memberItems.Select(x =>
                     {
-                        addedRows = memberItems.Select(x => new[] { x });
-                    }
+                        if (x is ITheoryDataRow row) return row.GetData();
+                        if (x is object[] arr) return arr;
+                        return new[] { x };
+                    });
                 }
             }
         }
diff --git a/tests/ImageSharp.Tests/TestUtilities/SixLaborsXunitTestFramework.cs b/tests/ImageSharp.Tests/TestUtilities/SixLaborsXunitTestFramework.cs
index 0dc37d533f..964b7c486e 100644
--- a/tests/ImageSharp.Tests/TestUtilities/SixLaborsXunitTestFramework.cs
+++ b/tests/ImageSharp.Tests/TestUtilities/SixLaborsXunitTestFramework.cs
@@ -13,6 +13,6 @@ public class SixLaborsXunitTestFramework : XunitTestFramework
 {
     public SixLaborsXunitTestFramework()
     {
-        Console.WriteLine(HostEnvironmentInfo.GetInformation());
+        Console.Error.WriteLine(HostEnvironmentInfo.GetInformation());
     }
 }
diff --git a/tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs b/tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs
index 1ac9100574..90bd8f939b 100644
--- a/tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs
+++ b/tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs
@@ -120,7 +120,7 @@ public class TestEnvironmentTests
     // https://github.com/SixLabors/ImageSharp/blob/381dff8640b721a34b1227c970fcf6ad6c5e3e72/ci-test.ps1#L30
     public static bool IsNot32BitNetFramework = !TestEnvironment.IsFramework || TestEnvironment.Is64BitProcess;
 
-    [Fact(SkipUnless = nameof(IsNot32BitNetFramework))]
+    [Fact(Skip = "Not supported on 32-bit .NET Framework", SkipUnless = nameof(IsNot32BitNetFramework))]
     public void RemoteExecutor_FailingRemoteTestShouldFailLocalTest()
     {
         static void FailingCode()