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How to mock DirectoryInfo class?
public interface IDirectoryInfoWrapper
  {
    public IFileInfoWrapper[] GetFiles(string searchPattern, SearchOption searchType);
    public IDirectoryInfoWrapper[] GetDirectories();
  }

// Check that the directory is valid
  DirectoryInfo directoryInfo = new DirectoryInfo( argPath );
  if ( directoryInfo.Exists == false )
  {
    throw new ArgumentException
        ("Invalid IFileFinder.FindFiles Directory Path: " + argPath);
  }

DirectoryInfo directoryInfo = new DirectoryInfo( argPath );

class Factory : IFactory
{
  IDirectoryInfoWrapper Create(string arg)
  {
    var dirInfo = new DirectoryInfo(arg);
    var wrapper = new DirectoryInfoWrapper(dirInfo);
    return wrapper;
  }
}