Add functional test to repro delete/restore issue

GVFS/GVFS.FunctionalTests/Program.cs

@@ -21,6 +21,11 @@ public static void Main(string[] args)
             NUnitRunner runner = new NUnitRunner(args);
             runner.AddGlobalSetupIfNeeded("GVFS.FunctionalTests.GlobalSetup");
 
+            if (runner.HasCustomArg("--debug"))
+            {
+                Debugger.Launch();
+            }
+
             if (runner.HasCustomArg("--no-shared-gvfs-cache"))
             {
                 Console.WriteLine("Running without a shared git object cache");

GVFS/GVFS.FunctionalTests/Tests/GitCommands/CorruptionScenarioTests.cs

@@ -0,0 +1,35 @@
+using GVFS.FunctionalTests.Properties;
+using NUnit.Framework;
+
+namespace GVFS.FunctionalTests.Tests.GitCommands
+{
+    /// <summary>
+    /// This class is used to reproduce corruption scenarios in the GVFS virtual projection.
+    /// </summary>
+    [Category(Categories.GitCommands)]
+    [TestFixtureSource(typeof(GitRepoTests), nameof(GitRepoTests.ValidateWorkingTree))]
+    public class CorruptionReproTests : GitRepoTests
+    {
+        public CorruptionReproTests(Settings.ValidateWorkingTreeMode validateWorkingTree)
+           : base(enlistmentPerTest: true, validateWorkingTree: validateWorkingTree)
+        {
+        }
+
+        /// <summary>
+        /// Reproduction of a reported issue:
+        /// Restoring a file after its parent directory was deleted fails with
+        /// "fatal: could not unlink 'path\to\': Directory not empty"
+        /// </summary>
+        [TestCase]
+        public void RestoreAfterDeleteNesteredDirectory()
+        {
+            // Delete a directory with nested subdirectories and files.
+            this.ValidateNonGitCommand("cmd.exe", "/c \"rmdir /s /q GVFlt_DeleteFileTest\"");
+
+            // Restore the working directory.
+            this.ValidateGitCommand("restore .");
+
+            this.FilesShouldMatchCheckoutOfSourceBranch();
+        }
+    }
+}

GVFS/GVFS.FunctionalTests/Tests/GitCommands/GitRepoTests.cs

@@ -269,6 +269,23 @@ protected void ValidateGitCommand(string command, params object[] args)
                 args);
         }
 
+        protected void ValidateNonGitCommand(string command, string args = "", bool ignoreErrors = false, bool checkStatus = true)
+        {
+            string controlRepoRoot = this.ControlGitRepo.RootPath;
+            string gvfsRepoRoot = this.Enlistment.RepoRoot;
+
+            ProcessResult expectedResult = ProcessHelper.Run(command, args, controlRepoRoot);
+            ProcessResult actualResult = ProcessHelper.Run(command, args, gvfsRepoRoot);
+            if (!ignoreErrors)
+            {
+                GitHelpers.ErrorsShouldMatch(command, expectedResult, actualResult);
+            }
+            if (checkStatus)
+            {
+                this.ValidateGitCommand("status");
+            }
+        }
+
         protected void ChangeMode(string filePath, ushort mode)
         {
             string virtualFile = Path.Combine(this.Enlistment.RepoRoot, filePath);

GVFS/GVFS.FunctionalTests/Tools/ProcessHelper.cs

@@ -6,6 +6,11 @@ namespace GVFS.FunctionalTests.Tools
     public static class ProcessHelper
     {
         public static ProcessResult Run(string fileName, string arguments)
+        {
+            return Run(fileName, arguments, null);
+        }
+
+        public static ProcessResult Run(string fileName, string arguments, string workingDirectory)
         {
             ProcessStartInfo startInfo = new ProcessStartInfo();
             startInfo.UseShellExecute = false;
@@ -14,6 +19,10 @@ public static ProcessResult Run(string fileName, string arguments)
             startInfo.CreateNoWindow = true;
             startInfo.FileName = fileName;
             startInfo.Arguments = arguments;
+            if (!string.IsNullOrEmpty(workingDirectory))
+            {
+                startInfo.WorkingDirectory = workingDirectory;
+            }
 
             return Run(startInfo);
         }