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Nitrox.Test/Model/Platforms/OS/Windows/RegistryTest.cs

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+using System.Runtime.Versioning;
+using System.Threading.Tasks;
+using Nitrox.Test.Model.Platforms;
+
+namespace NitroxModel.Platforms.OS.Windows;
+
+[TestClass]
+[SupportedOSPlatform("windows")]
+public class RegistryTest
+{
+    [OSTestMethod("windows")]
+    public async Task WaitsForRegistryKeyToExist()
+    {
+        const string PATH_TO_KEY = @"SOFTWARE\Nitrox\test";
+        
+        RegistryEx.Write(PATH_TO_KEY, 0);
+        Task<bool> readTask = Task.Run(async () =>
+        {
+            try
+            {
+                await RegistryEx.CompareWaitAsync<int>(PATH_TO_KEY,
+                                                   v => v == 1337,
+                                                   TimeSpan.FromSeconds(5));
+                return true;
+            }
+            catch (TaskCanceledException)
+            {
+                return false;
+            }
+        });
+        
+        RegistryEx.Write(PATH_TO_KEY, 1337);
+        Assert.IsTrue(await readTask);
+        
+        // Cleanup (we can keep "Nitrox" key intact).
+        RegistryEx.Delete(PATH_TO_KEY);
+        Assert.IsNull(RegistryEx.Read<string>(PATH_TO_KEY));
+    }
+}

Nitrox.Test/Model/Platforms/OSTestMethodAttribute.cs

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+namespace Nitrox.Test.Model.Platforms;
+
+[AttributeUsage(AttributeTargets.Method)]
+public class OSTestMethodAttribute : TestMethodAttribute
+{
+    public string Platform { get;}
+
+    /// <summary>
+    /// Test method attribute, that will only run the test on the specified platform.
+    /// </summary>
+    /// <param name="platform">case insensitive platform, i.e: linux, windows, osx</param>
+    public OSTestMethodAttribute(string platform)
+    {
+        Platform = platform;
+    }
+
+    public override TestResult[] Execute(ITestMethod testMethod)
+    {
+        if (!OperatingSystem.IsOSPlatform(Platform))
+        {
+            return [
+                new TestResult()
+                {
+                    Outcome = UnitTestOutcome.Inconclusive,
+                    TestContextMessages = $"This test can only be run on {Platform}"
+                }
+            ];
+        }
+
+        return base.Execute(testMethod);
+    }
+}