class BlockAdminThemeTest

class BlockAdminThemeTest extends BrowserTestBase {
  
  /**
   * Modules to install.
   *
   * @var array
   */
  protected static $modules = [
    'block',
    'contextual',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * Check for the accessibility of the admin theme on the block admin page.
   */
  public function testAdminTheme() {
    // Create administrative user.
    $admin_user = $this->drupalCreateUser([
      'administer blocks',
      'administer themes',
    ]);
    $this->drupalLogin($admin_user);
    // Ensure that access to block admin page is denied when theme is not
    // installed.
    $this->drupalGet('admin/structure/block/list/olivero');
    $this->assertSession()
      ->statusCodeEquals(403);
    // Install admin theme and confirm that tab is accessible.
    \Drupal::service('theme_installer')->install([
      'olivero',
    ]);
    $edit['admin_theme'] = 'olivero';
    $this->drupalGet('admin/appearance');
    $this->submitForm($edit, 'Save configuration');
    $this->drupalGet('admin/structure/block/list/olivero');
    $this->assertSession()
      ->statusCodeEquals(200);
  }
  
  /**
   * Ensure contextual links are disabled in Claro theme.
   */
  public function testClaroAdminTheme() {
    // Create administrative user.
    $admin_user = $this->drupalCreateUser([
      'access administration pages',
      'administer themes',
      'access contextual links',
      'view the administration theme',
    ]);
    $this->drupalLogin($admin_user);
    // Install admin theme and confirm that tab is accessible.
    \Drupal::service('theme_installer')->install([
      'claro',
    ]);
    $edit['admin_theme'] = 'claro';
    $this->drupalGet('admin/appearance');
    $this->submitForm($edit, 'Save configuration');
    // Define our block settings.
    $settings = [
      'theme' => 'claro',
      'region' => 'header',
    ];
    // Place a block.
    $block = $this->drupalPlaceBlock('local_tasks_block', $settings);
    // Open admin page.
    $this->drupalGet('admin');
    // Check if contextual link classes are unavailable.
    $this->assertSession()
      ->responseNotContains('<div data-contextual-id="block:block=' . $block->id() . ':langcode=en"></div>');
    $this->assertSession()
      ->responseNotContains('contextual-region');
  }

}