Internal class designed to delete the output directory. Meant solely for
   * use before and after the test is run; this is so next iterations of the
   * test do not encounter a "file already exists" error.
Internal class designed to delete the output directory. Meant solely for
   * use before and after the test is run; this is so next iterations of the
   * test do not encounter a "file already exists" error. | TestWordStats.java