public function all() {
    $commands = [
      'tests:composer:validate',
      'tests:php:lint',
      'tests:phpcs:sniff:all',
      'tests:yaml:lint:all',
      'tests:twig:lint:all',
    ];
    // To enable this command, set validate.acsf to TRUE in blt.yml.
    if ($this->getConfigValue('validate.acsf') == TRUE) {
      $commands[] = 'tests:acsf:validate';
    }

    $status_code = $this->invokeCommands($commands);
    return $status_code;
  }