diff --git a/LibGit2Sharp.Tests/BlobFixture.cs b/LibGit2Sharp.Tests/BlobFixture.cs
index 29934f08c..4c984bd34 100644
--- a/LibGit2Sharp.Tests/BlobFixture.cs
+++ b/LibGit2Sharp.Tests/BlobFixture.cs
@@ -222,7 +222,7 @@ public void CanTellIfTheBlobContentLooksLikeBinary()
 
         private static void SkipIfNotSupported(string autocrlf)
         {
-            InconclusiveIf(() => autocrlf == "true" && IsRunningOnUnix(), "Non-Windows does not support core.autocrlf = true");
+            InconclusiveIf(() => autocrlf == "true" && Constants.IsRunningOnUnix, "Non-Windows does not support core.autocrlf = true");
         }
     }
 }
diff --git a/LibGit2Sharp.Tests/LibGit2Sharp.Tests.csproj b/LibGit2Sharp.Tests/LibGit2Sharp.Tests.csproj
index 904c427d7..f608ab440 100644
--- a/LibGit2Sharp.Tests/LibGit2Sharp.Tests.csproj
+++ b/LibGit2Sharp.Tests/LibGit2Sharp.Tests.csproj
@@ -52,6 +52,9 @@
     <Compile Include="..\LibGit2Sharp\Core\Epoch.cs">
       <Link>TestHelpers\Epoch.cs</Link>
     </Compile>
+    <Compile Include="..\LibGit2Sharp\Core\Platform.cs">
+      <Link>TestHelpers\Platform.cs</Link>
+    </Compile>
     <Compile Include="BlameFixture.cs" />
     <Compile Include="ArchiveTarFixture.cs" />
     <Compile Include="CheckoutFixture.cs" />
diff --git a/LibGit2Sharp.Tests/ShadowCopyFixture.cs b/LibGit2Sharp.Tests/ShadowCopyFixture.cs
index 5f57a800c..f394e987e 100644
--- a/LibGit2Sharp.Tests/ShadowCopyFixture.cs
+++ b/LibGit2Sharp.Tests/ShadowCopyFixture.cs
@@ -57,7 +57,7 @@ public void CanProbeForNativeBinariesFromAShadowCopiedAssembly()
             string cachedAssembliesPath = Path.Combine(setup.CachePath, setup.ApplicationName);
             Assert.True(cachedAssemblyLocation.StartsWith(cachedAssembliesPath));
 
-            if (!IsRunningOnUnix())
+            if (!Constants.IsRunningOnUnix)
             {
                 // ...that this cache doesn't contain the `NativeBinaries` folder
                 string cachedAssemblyParentPath = Path.GetDirectoryName(cachedAssemblyLocation);
diff --git a/LibGit2Sharp.Tests/TestHelpers/BaseFixture.cs b/LibGit2Sharp.Tests/TestHelpers/BaseFixture.cs
index 0ee8a5569..017404760 100644
--- a/LibGit2Sharp.Tests/TestHelpers/BaseFixture.cs
+++ b/LibGit2Sharp.Tests/TestHelpers/BaseFixture.cs
@@ -106,14 +106,6 @@ private static bool IsFileSystemCaseSensitiveInternal()
             return !isInsensitive;
         }
 
-        // Should match LibGit2Sharp.Core.NativeMethods.IsRunningOnUnix()
-        protected static bool IsRunningOnUnix()
-        {
-            // see http://mono-project.com/FAQ%3a_Technical#Mono_Platforms
-            var p = (int)Environment.OSVersion.Platform;
-            return (p == 4) || (p == 6) || (p == 128);
-        }
-
         protected void CreateCorruptedDeadBeefHead(string repoPath)
         {
             const string deadbeef = "deadbeef";
diff --git a/LibGit2Sharp.Tests/TestHelpers/Constants.cs b/LibGit2Sharp.Tests/TestHelpers/Constants.cs
index 5a389136c..85f95c0fc 100644
--- a/LibGit2Sharp.Tests/TestHelpers/Constants.cs
+++ b/LibGit2Sharp.Tests/TestHelpers/Constants.cs
@@ -1,6 +1,8 @@
 using System;
 using System.Diagnostics;
 using System.IO;
+using System.Reflection;
+using LibGit2Sharp.Core;
 
 namespace LibGit2Sharp.Tests.TestHelpers
 {
@@ -30,6 +32,15 @@ public static class Constants
 
         public const string PrivateRepoUrl = "";
 
+        public static bool IsRunningOnUnix
+        {
+            get
+            {
+                return Platform.OperatingSystem == OperatingSystemType.MacOSX ||
+                       Platform.OperatingSystem == OperatingSystemType.Unix;
+            }
+        }
+
         public static Credentials PrivateRepoCredentials(string url, string usernameFromUrl,
                                                          SupportedCredentialTypes types)
         {
@@ -40,19 +51,15 @@ public static string BuildPath()
         {
             string tempPath = null;
 
-            var unixPath = Type.GetType("Mono.Unix.UnixPath, Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756");
-
-            if (unixPath != null)
+            if (IsRunningOnUnix)
             {
                 // We're running on Mono/*nix. Let's unwrap the path
-                tempPath = (string)unixPath.InvokeMember("GetCompleteRealPath",
-                    System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.FlattenHierarchy |
-                    System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Public,
-                    null, unixPath, new object[] { Path.GetTempPath() });
+                tempPath = UnwrapUnixTempPath();
             }
             else
             {
                 const string LibGit2TestPath = "LibGit2TestPath";
+
                 // We're running on .Net/Windows
                 if (Environment.GetEnvironmentVariables().Contains(LibGit2TestPath))
                 {
@@ -72,6 +79,16 @@ public static string BuildPath()
             return testWorkingDirectory;
         }
 
+        private static string UnwrapUnixTempPath()
+        {
+            var type = Type.GetType("Mono.Unix.UnixPath, Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756");
+
+            return (string)type.InvokeMember("GetCompleteRealPath",
+                BindingFlags.Static | BindingFlags.FlattenHierarchy |
+                BindingFlags.InvokeMethod | BindingFlags.Public,
+                null, type, new object[] { Path.GetTempPath() });
+        }
+
         // To help with creating secure strings to test with.
         private static System.Security.SecureString StringToSecureString(string str)
         {