Fixed some mono specific tests.

src/NzbDrone.Mono.Test/DiskProviderTests/DiskProviderFixture.cs

@@ -1,4 +1,5 @@
-using Mono.Unix;
+using System;
+using Mono.Unix;
 using NUnit.Framework;
 using NzbDrone.Common.Test.DiskTests;
 
@@ -15,6 +16,11 @@ namespace NzbDrone.Mono.Test.DiskProviderTests
 
         protected override void SetWritePermissions(string path, bool writable)
         {
+            if (Environment.UserName == "root")
+            {
+                Assert.Inconclusive("Need non-root user to test write permissions.");
+            }
+
             // Remove Write permissions, we're still owner so we can clean it up, but we'll have to do that explicitly.
 
             var entry = UnixFileSystemInfo.GetFileSystemEntry(path);