class SearchAdminThemeTest

class SearchAdminThemeTest extends BrowserTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'node',
    'search',
    'search_extra_type',
    'user',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * The administration theme name.
   *
   * @var string
   */
  protected $adminTheme = 'claro';
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    // Install an administration theme to make sure it used for search results.
    \Drupal::service('theme_installer')->install([
      $this->adminTheme,
    ]);
    \Drupal::configFactory()->getEditable('system.theme')
      ->set('admin', $this->adminTheme)
      ->save();
    // Create searching user.
    $user = $this->drupalCreateUser([
      'access content',
      'search content',
      'access user profiles',
      'view the administration theme',
    ]);
    // Log in with sufficient privileges.
    $this->drupalLogin($user);
  }
  
  /**
   * Tests that search results could be displayed in administration theme.
   *
   * @see \Drupal\node\Plugin\Search\NodeSearch
   * @see \Drupal\search_extra_type\Plugin\Search\SearchExtraTypeSearch
   * @see \Drupal\user\Plugin\Search\UserSearch
   */
  public function testSearchUsingAdminTheme() {
    /** @var \Drupal\search\SearchPageRepositoryInterface $repository */
    $repository = \Drupal::service('search.search_page_repository');
    $pages = $repository->getActiveSearchPages();
    // Test default configured pages.
    $page_ids = [
      'node_search' => FALSE,
      'dummy_search_type' => TRUE,
      'user_search' => FALSE,
    ];
    foreach ($page_ids as $page_id => $use_admin_theme) {
      $plugin = $pages[$page_id]->getPlugin();
      $path = 'search/' . $pages[$page_id]->getPath();
      $this->drupalGet($path);
      $session = $this->assertSession();
      // Make sure help plugin rendered help link.
      $path_help = $path . '/help';
      $session->linkByHrefExists($path_help);
      $this->assertSame($use_admin_theme, $plugin->usesAdminTheme());
      $this->assertAdminTheme($use_admin_theme);
      // Make sure that search help also rendered in admin theme.
      $this->drupalGet($path_help);
      $this->assertAdminTheme($use_admin_theme);
    }
  }
  
  /**
   * Asserts whether an administrative theme's used for the loaded page.
   *
   * @param bool $is_admin
   *   TRUE to test for administrative theme, FALSE otherwise.
   *
   * @internal
   */
  protected function assertAdminTheme(bool $is_admin) : void {
    if ($is_admin) {
      $this->assertSession()
        ->responseContains('core/themes/' . $this->adminTheme);
    }
    else {
      $this->assertSession()
        ->responseNotContains('core/themes/' . $this->adminTheme);
    }
  }

}