added some test for free space.

NzbDrone.Common.Test/DiskProviderTests/FreeSpaceFixture.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using FluentAssertions;
+using NUnit.Framework;
+using NzbDrone.Test.Common;
+
+namespace NzbDrone.Common.Test.DiskProviderTests
+{
+    [TestFixture]
+    public class IsParentFixture : TestBase<DiskProvider>
+    {
+        private string _parent = @"C:\Test".AsOsAgnostic();
+
+        [Test]
+        public void should_return_false_when_not_a_child()
+        {
+            var path = @"C:\Another Folder".AsOsAgnostic();
+
+            Subject.IsParent(_parent, path).Should().BeFalse();
+        }
+
+        [Test]
+        public void should_return_true_when_folder_is_parent_of_another_folder()
+        {
+            var path = @"C:\Test\TV".AsOsAgnostic();
+
+            Subject.IsParent(_parent, path).Should().BeTrue();
+        }
+
+        [Test]
+        public void should_return_true_when_folder_is_parent_of_a_file()
+        {
+            var path = @"C:\Test\30.Rock.S01E01.Pilot.avi".AsOsAgnostic();
+
+            Subject.IsParent(_parent, path).Should().BeTrue();
+        }
+    }
+}

NzbDrone.Common.Test/DiskProviderTests/IsParentFixture.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Text;
 using FluentAssertions;
@@ -9,32 +10,31 @@ using NzbDrone.Test.Common;
 namespace NzbDrone.Common.Test.DiskProviderTests
 {
     [TestFixture]
-    public class IsParentFixture : TestBase<DiskProvider>
+    public class FreeSpaceFixture : TestBase<DiskProvider>
     {
-        private string _parent = @"C:\Test".AsOsAgnostic();
-
         [Test]
-        public void should_return_false_when_not_a_child()
+        public void should_get_free_space_for_folder()
         {
-            var path = @"C:\Another Folder".AsOsAgnostic();
+            var path = @"C:\".AsOsAgnostic();
 
-            Subject.IsParent(_parent, path).Should().BeFalse();
+            Subject.GetAvilableSpace(path).Should().NotBe(0);
         }
 
         [Test]
-        public void should_return_true_when_folder_is_parent_of_another_folder()
+        public void should_get_free_space_for_folder_that_doesnt_exist()
         {
-            var path = @"C:\Test\TV".AsOsAgnostic();
+            var path = @"C:\".AsOsAgnostic();
 
-            Subject.IsParent(_parent, path).Should().BeTrue();
+            Subject.GetAvilableSpace(Path.Combine(path, "invalidFolder")).Should().NotBe(0);
         }
 
+
         [Test]
-        public void should_return_true_when_folder_is_parent_of_a_file()
+        public void should_get_free_space_for_drive_that_doesnt_exist()
         {
-            var path = @"C:\Test\30.Rock.S01E01.Pilot.avi".AsOsAgnostic();
+            WindowsOnly();
 
-            Subject.IsParent(_parent, path).Should().BeTrue();
+            Subject.GetAvilableSpace("J:\\").Should().NotBe(0);
         }
     }
 }

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

@@ -62,6 +62,7 @@
     <Compile Include="CacheTests\CachedManagerFixture.cs" />
     <Compile Include="CacheTests\CachedFixture.cs" />
     <Compile Include="ConfigFileProviderTest.cs" />
+    <Compile Include="DiskProviderTests\FreeSpaceFixture.cs" />
     <Compile Include="DiskProviderTests\IsParentFixture.cs" />
     <Compile Include="EnsureTest\PathExtensionFixture.cs" />
     <Compile Include="EnvironmentTests\StartupArgumentsFixture.cs" />