Add support for deleting TempDirectory with read-only files

Author: jcansdale

src/UnitTests/Helpers/TestBaseClass.cs

@@ -64,7 +64,7 @@ protected static PullRequest CreatePullRequest(User user, int id, ItemState stat
             null, null, null);
         return new PullRequest(0, uri, uri, uri, uri, uri, uri,
             id, state, title, "", createdAt, updatedAt,
-            null, null, 
+            null, null,
             new GitReference(uri.ToString(), "foo:bar", "bar", "123", user, repo),
             new GitReference(uri.ToString(), "foo:baz", "baz", "123", user, repo),
             user, null, null, false, null,
@@ -87,8 +87,23 @@ public TempDirectory()
 
         public void Dispose()
         {
+            // Remove any read-only attributes
+            SetFileAttributes(Directory, FileAttributes.Normal);
             Directory.Delete(true);
         }
+
+        static void SetFileAttributes(DirectoryInfo dir, FileAttributes attributes)
+        {
+            foreach (DirectoryInfo subdir in dir.GetDirectories())
+            {
+                SetFileAttributes(subdir, attributes);
+            }
+
+            foreach (var file in dir.GetFiles())
+            {
+                File.SetAttributes(file.FullName, attributes);
+            }
+        }
     }
 
     protected class TempRepository : TempDirectory