You can no longer add root folders that don't already exist.

NzbDrone.Common.Test/DiskProviderFixture.cs

@@ -1,5 +1,5 @@
 // ReSharper disable InconsistentNaming
-using System;
+
 using System.IO;
 using System.Linq;
 using FluentAssertions;
@@ -9,7 +9,7 @@ using NzbDrone.Test.Common;
 namespace NzbDrone.Common.Test
 {
     [TestFixture]
-    public class DiskProviderTests : TestBase
+    public class DiskProviderFixture : TestBase
     {
         DirectoryInfo BinFolder;
         DirectoryInfo BinFolderCopy;
@@ -34,6 +34,24 @@ namespace NzbDrone.Common.Test
             }
         }
 
+        [Test]
+        public void directory_exist_should_be_able_to_find_existing_folder()
+        {
+            Mocker.Resolve<DiskProvider>().FolderExists(TempFolder).Should().BeTrue();
+        }
+
+        [Test]
+        public void directory_exist_should_be_able_to_find_existing_unc_share()
+        {
+            Mocker.Resolve<DiskProvider>().FolderExists(@"\\localhost\c$").Should().BeTrue();
+        }
+        
+        [Test]
+        public void directory_exist_should_not_be_able_to_find_none_existing_folder()
+        {
+            Mocker.Resolve<DiskProvider>().FolderExists(@"C:\ThisBetterNotExist\").Should().BeFalse();
+        }
+
         [Test]
         public void moveFile_should_overwrite_existing_file()
         {

NzbDrone.Common.Test/NzbDrone.Common.Test.csproj

@@ -65,7 +65,7 @@
   <ItemGroup>
     <Compile Include="ConfigFileProviderTest.cs" />
     <Compile Include="PathExtentionFixture.cs" />
-    <Compile Include="DiskProviderTests.cs" />
+    <Compile Include="DiskProviderFixture.cs" />
     <Compile Include="EnviromentProviderTest.cs" />
     <Compile Include="ProcessProviderTests.cs" />
     <Compile Include="ServiceProviderTests.cs" />