Add RegistryExtensions with ContainsSubKey

Directory.Packages.props

@@ -8,9 +8,11 @@
     <PackageVersion Include="GitHubActionsTestLogger" Version="3.0.3" />
     <PackageVersion Include="FluentAssertions" Version="6.12.0" />
     <PackageVersion Include="Gress" Version="2.1.1" />
+    <PackageVersion Include="Microsoft.Win32.Registry" Version="5.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="PolyShim" Version="2.8.2" />
     <PackageVersion Include="xunit" Version="2.9.2" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
+    <PackageVersion Include="xunit.skippablefact" Version="1.5.61" />
   </ItemGroup>
 </Project>

PowerKit.Tests/PowerKit.Tests.csproj

@@ -19,6 +19,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.runner.visualstudio" />
+    <PackageReference Include="xunit.skippablefact" />
   </ItemGroup>
 
 </Project>

PowerKit.Tests/RegistryExtensionsTests.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Runtime.Versioning;
+using FluentAssertions;
+using Microsoft.Win32;
+using PowerKit.Extensions;
+using Xunit;
+
+namespace PowerKit.Tests;
+
+public class RegistryExtensionsTests
+{
+    [SkippableFact]
+    [SupportedOSPlatform("windows")]
+    public void ContainsSubKey_Exists_Test()
+    {
+        Skip.IfNot(OperatingSystem.IsWindows());
+
+        // Arrange
+        using var key = Registry.CurrentUser.OpenSubKey("Software", false)!;
+
+        // Act & assert
+        key.ContainsSubKey("Microsoft").Should().BeTrue();
+    }
+
+    [SkippableFact]
+    [SupportedOSPlatform("windows")]
+    public void ContainsSubKey_NotExists_Test()
+    {
+        Skip.IfNot(OperatingSystem.IsWindows());
+
+        // Arrange
+        using var key = Registry.CurrentUser.OpenSubKey("Software", false)!;
+
+        // Act & assert
+        key.ContainsSubKey("this-sub-key-definitely-does-not-exist").Should().BeFalse();
+    }
+}

PowerKit/Extensions/RegistryExtensions.cs

@@ -0,0 +1,20 @@
+using System.Runtime.Versioning;
+using Microsoft.Win32;
+
+namespace PowerKit.Extensions;
+
+internal static class RegistryExtensions
+{
+    extension(RegistryKey key)
+    {
+        /// <summary>
+        /// Checks whether a sub-key with the specified name exists under the registry key.
+        /// </summary>
+        [SupportedOSPlatform("windows")]
+        public bool ContainsSubKey(string name)
+        {
+            using var subKey = key.OpenSubKey(name, false);
+            return subKey is not null;
+        }
+    }
+}

PowerKit/PowerKit.csproj

@@ -30,6 +30,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.Win32.Registry" />
     <PackageReference Include="PolyShim" />
   </ItemGroup>
 </Project>