Merge pull request #50 from AArnott/documentClassUseCase

Document support for class-level OS targeting

docfx/docs/getting-started.md

@@ -30,7 +30,7 @@ your library is not expected to be implemented in some of them. For example:
 
 ### Supported platforms
 
-Apply the @System.Runtime.Versioning.SupportedOSPlatformAttribute and/or @System.Runtime.Versioning.UnsupportedOSPlatformAttribute to a test method to skip it based on the platform the test is running on.
+Apply the @System.Runtime.Versioning.SupportedOSPlatformAttribute and/or @System.Runtime.Versioning.UnsupportedOSPlatformAttribute to a test method or test class to skip it based on the platform the test is running on.
 
 [!code-csharp[](../../samples/GettingStarted.cs#OSCheck)]
 

samples/GettingStarted.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Andrew Arnott. All rights reserved.
 // Licensed under the Microsoft Public License (Ms-PL). See LICENSE.txt file in the project root for full license information.
 
-using System.Runtime.InteropServices;
 using System.Runtime.Versioning;
 using System.Security.Cryptography;
 using Xunit;
@@ -26,11 +25,25 @@ public void TestFunctionalityWhichIsNotSupportedOnSomePlatforms()
     #endregion
 
     #region OSCheck
-    [SkippableFact, SupportedOSPlatform("Windows")]
-    public void TestCngKey()
+    public class AnyTestClass
     {
-        var key = CngKey.Create(CngAlgorithm.Rsa);
-        Assert.NotNull(key);
+        [SkippableFact]
+        [SupportedOSPlatform("Windows")]
+        public void TestCngKey()
+        {
+            var key = CngKey.Create(CngAlgorithm.Rsa);
+            Assert.NotNull(key);
+        }
+    }
+
+    [SupportedOSPlatform("Windows")]
+    public class WindowsOnlyTestClass
+    {
+        [SkippableFact]
+        public void SomeTest()
+        {
+            // This test will only run on Windows.
+        }
     }
     #endregion
 }