Added Mono version health check

src/NzbDrone.Common.Test/DiskProviderTests/FreeSpaceFixtureBase.cs

@@ -36,7 +36,7 @@ namespace NzbDrone.Common.Test.DiskProviderTests
         [Test]
         public void should_be_able_to_check_space_on_ramdrive()
         {
-            LinuxOnly();
+            MonoOnly();
             Subject.GetAvailableSpace("/run/").Should().NotBe(0);
         }
 

src/NzbDrone.Common.Test/EnsureTest/PathExtensionFixture.cs

@@ -19,7 +19,7 @@ namespace NzbDrone.Common.Test.EnsureTest
         [TestCase(@"/var/user/file with, comma.mkv")]
         public void EnsureLinuxPath(string path)
         {
-            LinuxOnly();
+            MonoOnly();
             Ensure.That(path, () => path).IsValidPath();
         }
     }

src/NzbDrone.Common.Test/PathExtensionFixture.cs

@@ -50,7 +50,7 @@ namespace NzbDrone.Common.Test
         [TestCase(@"//CAPITAL//lower// ", @"/CAPITAL/lower")]
         public void Clean_Path_Linux(string dirty, string clean)
         {
-            LinuxOnly();
+            MonoOnly();
 
             var result = dirty.CleanFilePath();
             result.Should().Be(clean);
@@ -139,7 +139,7 @@ namespace NzbDrone.Common.Test
         [Test]
         public void get_actual_casing_should_return_original_value_in_linux()
         {
-            LinuxOnly();
+            MonoOnly();
             var path = Directory.GetCurrentDirectory();
             path.GetActualCasing().Should().Be(path);
             path.GetActualCasing().Should().Be(path);