executePreinstallClass example

  public function setup($profile = 'testing', $setup_class = NULL, $langcode = 'en') {
    $this->profile = $profile;
    $this->langcode = $langcode;
    $this->setupBaseUrl();
    $this->prepareEnvironment();
    $this->executePreinstallClass($setup_class);
    $this->installDrupal();
    $this->executeSetupClass($setup_class);
  }

  /** * Installs Drupal into the test site. */
  protected function installDrupal() {
    $this->initUserSession();
    $this->prepareSettings();
    $this->doInstall();