Add MacOsX and Xbox to platform attribute

src/NUnitCore/core/PlatformHelper.cs

@@ -21,7 +21,11 @@ namespace NUnit.Core
 		/// Comma-delimited list of all supported OS platform constants
 		/// </summary>
 		public static readonly string OSPlatforms =
+#if CLR_2_0 || CLR_4_0
+            "Win,Win32,Win32S,Win32NT,Win32Windows,WinCE,Win95,Win98,WinMe,NT3,NT4,NT5,NT6,Win2K,WinXP,Win2003Server,Vista,Win2008Server,Win2008ServerR2,Win2012Server,Windows7,Windows8,Unix,Linux,Xbox,MacOSX";
+#else
 			"Win,Win32,Win32S,Win32NT,Win32Windows,WinCE,Win95,Win98,WinMe,NT3,NT4,NT5,NT6,Win2K,WinXP,Win2003Server,Vista,Win2008Server,Win2008ServerR2,Win2012Server,Windows7,Windows8,Unix,Linux";
+#endif
 		
 		/// <summary>
 		/// Comma-delimited list of all supported Runtime platform constants
@@ -198,6 +202,14 @@ namespace NUnit.Core
 				case "LINUX":
                     isSupported = os.IsUnix;
 					break;
+#if (CLR_2_0 || CLR_4_0) && !NETCF
+                case "XBOX":
+                    isSupported = os.IsXbox;
+                    break;
+                case "MACOSX":
+                    isSupported = os.IsMacOSX;
+                    break;
+#endif
 
                 default:
                     isSupported = IsRuntimeSupported(platformName);

src/NUnitCore/interfaces/OSPlatform.cs

@@ -206,6 +206,24 @@ namespace NUnit.Core
             get { return (int)platform == 3; } // PlatformID.WinCE not defined in .NET 1.0
         }
 
+#if (CLR_2_0 || CLR_4_0) && !NETCF
+        /// <summary>
+        /// Return true if the platform is Xbox
+        /// </summary>
+        public bool IsXbox
+        {
+            get { return platform == PlatformID.Xbox; }
+        }
+
+        /// <summary>
+        /// Return true if the platform is MacOSX
+        /// </summary>
+        public bool IsMacOSX
+        {
+            get { return platform == PlatformID.MacOSX; }
+        }
+#endif
+
         /// <summary>
         /// Return true if the platform is Windows 95
         /// </summary>

src/NUnitCore/tests/PlatformDetectionTests.cs

@@ -199,6 +199,24 @@ namespace NUnit.Core.Tests
                 "UNIX,Linux");
         }
 
+#if (CLR_2_0 || CLR_4_0) && !NETCF
+        [Test]
+        public void DetectXbox()
+        {
+            CheckOSPlatforms(
+                new OSPlatform(PlatformID.Xbox, new Version(0, 0)),
+                "Xbox");
+        }
+
+        [Test]
+        public void DetectMacOSX()
+        {
+            CheckOSPlatforms(
+                new OSPlatform(PlatformID.MacOSX, new Version(0, 0)),
+                "MacOSX");
+        }
+#endif
+
         [Test]
 		public void DetectNet10()
 		{