public void Initialize()
        {
            IOSamples.ClearFolder();

            IOSamples.CreateFiles("T1.txt", "Y1.yml", "J1.json");
            IOSamples.CreateFolderAndFiles("inner1", "T2.txt");

            // empty folder
            IOSamples.CreateFolder("inner2");

            IOSamples.CreateFolderAndFiles("inner3", "Y2.yml");
            IOSamples.CreateFolderAndFiles("inner3/deeper", "J2.json", "T3.txt");
        }