class BlockHiddenRegionTest

class BlockHiddenRegionTest extends BrowserTestBase {
  
  /**
   * An administrative user to configure the test environment.
   */
  protected $adminUser;
  
  /**
   * Modules to install.
   *
   * @var array
   */
  protected static $modules = [
    'block',
    'block_test',
    'search',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    // Create administrative user.
    $this->adminUser = $this->drupalCreateUser([
      'administer blocks',
      'administer themes',
      'search content',
    ]);
    $this->drupalLogin($this->adminUser);
    $this->drupalPlaceBlock('search_form_block');
    $this->drupalPlaceBlock('local_tasks_block');
  }
  
  /**
   * Tests that hidden regions do not inherit blocks when a theme is installed.
   */
  public function testBlockNotInHiddenRegion() {
    // Ensure that the search form block is displayed.
    $this->drupalGet('');
    $this->assertSession()
      ->pageTextContains('Search');
    // Install "block_test_theme" and set it as the default theme.
    $theme = 'block_test_theme';
    // We need to install a non-hidden theme so that there is more than one
    // local task.
    \Drupal::service('theme_installer')->install([
      $theme,
      'stark',
    ]);
    $this->config('system.theme')
      ->set('default', $theme)
      ->save();
    // Installing a theme will cause the kernel terminate event to rebuild the
    // router. Simulate that here.
    \Drupal::service('router.builder')->rebuildIfNeeded();
    // Ensure that "block_test_theme" is set as the default theme.
    $this->drupalGet('admin/structure/block');
    $this->assertSession()
      ->pageTextContains('Block test theme(active tab)');
    // Ensure that the search form block is displayed.
    $this->drupalGet('');
    $this->assertSession()
      ->pageTextContains('Search');
  }

}