Sets the root testing directory and reinitializes any additional test paths
   * that are under the root.  This method is intended to be called from a
   * subclass's @BeforeClass method if there is a need to override the testing
   * directory.
Sets the root testing directory and reinitializes any additional test paths
   * that are under the root.  This method is intended to be called from a
   * subclass's @BeforeClass method if there is a need to override the testing
   * directory. | TestListFiles.java