Adds OSPlatform.FreeBSD.

src/System.Runtime.InteropServices.RuntimeInformation/src/OSPlatform.cs

@@ -17,6 +17,14 @@ public struct OSPlatform : IEquatable<OSPlatform>
         private static readonly OSPlatform s_osx = new OSPlatform(OSXName);
         private static readonly OSPlatform s_windows = new OSPlatform(WindowsName);
 
+        public static OSPlatform FreeBSD
+        {
+            get
+            {
+                return s_freebsd;
+            }
+        }
+
         public static OSPlatform Linux
         {
             get

src/System.Runtime.InteropServices.RuntimeInformation/src/RuntimeInformation.FreeBSD.cs

@@ -1,15 +1,13 @@
-// Copyright (c) Microsoft. All rights reserved.
+// Copyright (c) Microsoft. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 namespace System.Runtime.InteropServices
 {
     public static class RuntimeInformation
     {
-        private static OSPlatform s_freeBSD = OSPlatform.Create("FREEBSD");
-
         public static bool IsOSPlatform(OSPlatform osPlatform)
         {
-            return s_freeBSD == osPlatform;
+            return OSPlatform.FreeBSD == osPlatform;
         }
     }
 }

src/System.Runtime.InteropServices.RuntimeInformation/tests/CheckPlatformTests.cs

@@ -8,6 +8,21 @@ namespace System.Runtime.InteropServices.RuntimeInformationTests
 {
     public class CheckPlatformTests
     {
+        [Fact, PlatformSpecific(PlatformID.FreeBSD)]
+        public void CheckFreeBSD()
+        {
+            Assert.True(RuntimeInformation.IsOSPlatform(OSPlatform.FreeBSD));
+            Assert.True(RuntimeInformation.IsOSPlatform(OSPlatform.Create("FREEBSD")));
+
+            Assert.False(RuntimeInformation.IsOSPlatform(OSPlatform.Linux));
+            Assert.False(RuntimeInformation.IsOSPlatform(OSPlatform.Create("linux")));
+            Assert.False(RuntimeInformation.IsOSPlatform(OSPlatform.Create("UNIX")));
+            Assert.False(RuntimeInformation.IsOSPlatform(OSPlatform.Create("DARWIN")));
+            Assert.False(RuntimeInformation.IsOSPlatform(OSPlatform.Create("ubuntu")));
+            Assert.False(RuntimeInformation.IsOSPlatform(OSPlatform.Windows));
+            Assert.False(RuntimeInformation.IsOSPlatform(OSPlatform.OSX));
+        }
+
         [Fact, PlatformSpecific(PlatformID.Linux)]
         public void CheckLinux()
         {