public void CheckoutCleansUpTombstones()
        {
            const string folderToDelete = "Scripts";

            // Delete directory to create the tombstone
            string directoryToDelete = this.Enlistment.GetVirtualPathTo(folderToDelete);

            this.fileSystem.DeleteDirectory(directoryToDelete);
            this.Enlistment.UnmountGSD();

            // Remove the directory entry from modified paths so git will not keep the folder up to date
            string modifiedPathsFile    = Path.Combine(this.Enlistment.DotGSDRoot, TestConstants.Databases.ModifiedPaths);
            string modifiedPathsContent = this.fileSystem.ReadAllText(modifiedPathsFile);

            modifiedPathsContent = string.Join(Delimiter, modifiedPathsContent.Split(new[] { Delimiter }, StringSplitOptions.RemoveEmptyEntries).Where(x => !x.StartsWith($"A {folderToDelete}/")));
            this.fileSystem.WriteAllText(modifiedPathsFile, modifiedPathsContent + Delimiter);

            // Add tombstone folder entry to the placeholder database so the checkout will remove the tombstone
            // and start projecting the folder again
            string placeholderDatabasePath = Path.Combine(this.Enlistment.DotGSDRoot, TestConstants.Databases.GSD);

            GSDHelpers.AddPlaceholderFolder(placeholderDatabasePath, folderToDelete, TombstoneFolderPlaceholderType);

            this.Enlistment.MountGSD();
            directoryToDelete.ShouldNotExistOnDisk(this.fileSystem);

            // checkout branch to remove tombstones and project the folder again
            GitHelpers.InvokeGitAgainstGSDRepo(this.Enlistment.RepoRoot, "checkout -f HEAD");
            directoryToDelete.ShouldBeADirectory(this.fileSystem);

            this.Enlistment.UnmountGSD();

            string placholders = GSDHelpers.GetAllSQLitePlaceholdersAsString(placeholderDatabasePath);

            placholders.ShouldNotContain(ignoreCase: false, unexpectedSubstrings: $"{folderToDelete}{GSDHelpers.PlaceholderFieldDelimiter}{TombstoneFolderPlaceholderType}{GSDHelpers.PlaceholderFieldDelimiter}");
        }