doInstall example

$this->executePreinstallClass($setup_class);
    $this->installDrupal();
    $this->executeSetupClass($setup_class);
  }

  /** * Installs Drupal into the test site. */
  protected function installDrupal() {
    $this->initUserSession();
    $this->prepareSettings();
    $this->doInstall();
    $this->initSettings();
    $container = $this->initKernel(\Drupal::request());
    $this->initConfig($container);
  }

  /** * Uses the setup file to configure Drupal. * * @param string $class * The fully qualified class name, which should set up Drupal for tests. For * example this class could create content types and fields or install * modules. The class needs to implement TestSetupInterface. * * @see \Drupal\TestSite\TestSetupInterface */

$options[$value] = $label;
    }
    return $options;
  }

  /** * Installs Drupal into the test site. */
  public function installDrupal() {
    $this->initUserSession();
    $this->prepareSettings();
    $this->doInstall();
    $this->initSettings();
    $this->container = $container = $this->initKernel(\Drupal::request());
    $this->initConfig($container);
    $this->installDefaultThemeFromClassProperty($container);
    $this->installModulesFromClassProperty($container);

    // Clear the static cache so that subsequent cache invalidations will work     // as expected.     $this->container->get('cache_tags.invalidator')->resetChecksums();

    // Generate a route to prime the URL generator with the correct base URL.

// Set up the browser test output file.     $this->initBrowserOutputFile();
  }

  /** * {@inheritdoc} */
  public function installDrupal() {
    $this->initUserSession();
    $this->prepareSettings();
    $this->doInstall();
    $this->initSettings();

    $request = Request::createFromGlobals();
    $container = $this->initKernel($request);
    $this->initConfig($container);
  }

  /** * {@inheritdoc} */
  protected function doInstall() {