NodeTitleXSSTest.php

<?php

namespace Drupal\Tests\node\Functional;

use Drupal\Component\Utility\Html;

/**
 * Create a node with dangerous tags in its title and test that they are
 * escaped.
 *
 * @group node
 */
class NodeTitleXSSTest extends NodeTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests XSS functionality with a node entity.
     */
    public function testNodeTitleXSS() {
        // Prepare a user to do the stuff.
        $web_user = $this->drupalCreateUser([
            'create page content',
            'edit any page content',
        ]);
        $this->drupalLogin($web_user);
        $xss = '<script>alert("xss")</script>';
        $title = $xss . $this->randomMachineName();
        $edit = [];
        $edit['title[0][value]'] = $title;
        $this->drupalPostForm('node/add/page', $edit, t('Preview'));
        $this->assertNoRaw($xss, 'Harmful tags are escaped when previewing a node.');
        $settings = [
            'title' => $title,
        ];
        $node = $this->drupalCreateNode($settings);
        $this->drupalGet('node/' . $node->id());
        // Titles should be escaped.
        $this->assertRaw('<title>' . Html::escape($title) . ' | Drupal</title>', 'Title is displayed when viewing a node.');
        $this->assertNoRaw($xss, 'Harmful tags are escaped when viewing a node.');
        $this->drupalGet('node/' . $node->id() . '/edit');
        $this->assertNoRaw($xss, 'Harmful tags are escaped when editing a node.');
    }

}