BlockDemoTest.php

<?php

namespace Drupal\Tests\block\Functional;

use Drupal\Tests\BrowserTestBase;

/**
 * Tests the block demo page with admin themes.
 *
 * @group block
 */
class BlockDemoTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'block',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Check for the accessibility of the admin block demo page.
     */
    public function testBlockDemo() {
        // Create administrative user.
        $admin_user = $this->drupalCreateUser([
            'administer blocks',
            'administer themes',
        ]);
        $this->drupalLogin($admin_user);
        // Confirm we have access to the block demo page for the default theme.
        $config = $this->container
            ->get('config.factory')
            ->get('system.theme');
        $default_theme = $config->get('default');
        $this->drupalGet('admin/structure/block/demo/' . $default_theme);
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->linkByHrefExists('admin/structure/block');
        $this->assertSession()
            ->linkByHrefNotExists('admin/structure/block/list/' . $default_theme);
        // All available themes in core.
        $available_themes = [
            'olivero',
            'claro',
            'stark',
        ];
        // All available themes minute minus the default theme.
        $themes = array_diff($available_themes, [
            $default_theme,
        ]);
        foreach ($themes as $theme) {
            // Install theme.
            $this->container
                ->get('theme_installer')
                ->install([
                $theme,
            ]);
            // Confirm access to the block demo page for the theme.
            $this->drupalGet('admin/structure/block/demo/' . $theme);
            $this->assertSession()
                ->statusCodeEquals(200);
            // Confirm existence of link for "Exit block region demonstration".
            $this->assertSession()
                ->linkByHrefExists('admin/structure/block/list/' . $theme);
        }
        // Confirm access to the block demo page is denied for an invalid theme.
        $this->drupalGet('admin/structure/block/demo/invalid_theme');
        $this->assertSession()
            ->statusCodeEquals(403);
    }

}