code: public static void main(String... args) {
          Result result = new JUnitCore().runMain(new RealSystem(), args);
          System.exit(result.wasSuccessful() ? 0 : 1);
      }
docs: Run the tests contained in the classes named in the <code>args</code>.
  If all tests run successfully, exit with a status of 0. Otherwise exit with a status of 1.
  Write feedback while tests are running and write
  stack traces for all failed tests after the tests all complete.
  
  @param args names of classes in which to find tests to run