class EntityFilteringThemeTest

class EntityFilteringThemeTest extends BrowserTestBase {
    use CommentTestTrait;
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Use the standard profile.
     *
     * We test entity theming with the default node, user, comment, and taxonomy
     * configurations at several paths in the standard profile.
     *
     * @var string
     */
    protected $profile = 'standard';
    
    /**
     * A list of all available themes.
     *
     * @var \Drupal\Core\Extension\Extension[]
     */
    protected $themes;
    
    /**
     * A test user.
     *
     * @var \Drupal\user\User
     */
    protected $user;
    
    /**
     * A test node.
     *
     * @var \Drupal\node\Node
     */
    protected $node;
    
    /**
     * A test taxonomy term.
     *
     * @var \Drupal\taxonomy\Term
     */
    protected $term;
    
    /**
     * A test comment.
     *
     * @var \Drupal\comment\Comment
     */
    protected $comment;
    
    /**
     * A string containing markup and JS.
     *
     * @var string
     */
    protected $xssLabel = "string with <em>HTML</em> and <script>alert('JS');</script>";
    protected function setUp() {
        parent::setUp();
        // Install all available non-testing themes.
        $listing = new ExtensionDiscovery(\Drupal::root());
        $this->themes = $listing->scan('theme', FALSE);
        \Drupal::service('theme_installer')->install(array_keys($this->themes));
        // Create a test user.
        $this->user = $this->drupalCreateUser([
            'access content',
            'access user profiles',
        ]);
        $this->user->name = $this->xssLabel;
        $this->user
            ->save();
        $this->drupalLogin($this->user);
        // Create a test term.
        $this->term = Term::create([
            'name' => $this->xssLabel,
            'vid' => 1,
        ]);
        $this->term
            ->save();
        // Add a comment field.
        $this->addDefaultCommentField('node', 'article', 'comment', CommentItemInterface::OPEN);
        // Create a test node tagged with the test term.
        $this->node = $this->drupalCreateNode([
            'title' => $this->xssLabel,
            'type' => 'article',
            'promote' => NodeInterface::PROMOTED,
            'field_tags' => [
                [
                    'target_id' => $this->term
                        ->id(),
                ],
            ],
        ]);
        // Create a test comment on the test node.
        $this->comment = Comment::create([
            'entity_id' => $this->node
                ->id(),
            'entity_type' => 'node',
            'field_name' => 'comment',
            'status' => CommentInterface::PUBLISHED,
            'subject' => $this->xssLabel,
            'comment_body' => [
                $this->randomMachineName(),
            ],
        ]);
        $this->comment
            ->save();
    }
    
    /**
     * Checks each themed entity for XSS filtering in available themes.
     */
    public function testThemedEntity() {
        // Check paths where various view modes of the entities are rendered.
        $paths = [
            'user',
            'node',
            'node/' . $this->node
                ->id(),
            'taxonomy/term/' . $this->term
                ->id(),
        ];
        // Check each path in all available themes.
        foreach ($this->themes as $name => $theme) {
            $this->config('system.theme')
                ->set('default', $name)
                ->save();
            foreach ($paths as $path) {
                $this->drupalGet($path);
                $this->assertSession()
                    ->statusCodeEquals(200);
                $this->assertNoRaw($this->xssLabel);
            }
        }
    }

}