NonDefaultBlockAdminTest.php

<?php

namespace Drupal\Tests\block\Functional;

use Drupal\Tests\BrowserTestBase;

/**
 * Tests the block administration page for a non-default theme.
 *
 * @group block
 */
class NonDefaultBlockAdminTest extends BrowserTestBase {
    
    /**
     * Modules to install.
     *
     * @var array
     */
    protected static $modules = [
        'block',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalPlaceBlock('local_tasks_block');
    }
    
    /**
     * Tests non-default theme admin.
     */
    public function testNonDefaultBlockAdmin() {
        $admin_user = $this->drupalCreateUser([
            'administer blocks',
            'administer themes',
        ]);
        $this->drupalLogin($admin_user);
        $new_theme = 'olivero';
        \Drupal::service('theme_installer')->install([
            $new_theme,
        ]);
        // Ensure that the Olivero tab is shown.
        $this->drupalGet('admin/structure/block/list/' . $new_theme);
        $this->assertSession()
            ->pageTextContains('Olivero(active tab)');
    }

}