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}");
}