Issue #3251817 by alexpott, jonathan1055, nicxvan, longwave: Make run-tests.sh...

        simpletest_script_print_alternatives($first_group, $all_groups);

        exit(SIMPLETEST_SCRIPT_EXIT_FAILURE);

      }

      // Ensure our list of tests contains only one entry for each test.

      // Merge the tests from the groups together.

      foreach ($args['test_names'] as $group_name) {

        $test_list = array_merge($test_list, array_flip(array_keys($groups[$group_name])));

        $test_list = array_merge($test_list, array_keys($groups[$group_name]));

      }

      $test_list = array_flip($test_list);

      // Ensure our list of tests contains only one entry for each test.

      $test_list = array_unique($test_list);

    }

  }