public GroupMerger(IPreprocessingIo io, IGroupMergerLogger log)
        {
            _io  = io;
            _log = log;

            _log.WorkingIn(io.GetFullPath_In(""), io.GetFullPath_Merged(""));
        }
 public void Setup()
 {
     _log = Mock.Of <IGroupMergerLogger>();
     _sut = new GroupMerger(Io, _log);
 }