class NodeTitleTest

class NodeTitleTest extends NodeTestBase {
    use CommentTestTrait;
    use AssertBreadcrumbTrait;
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'comment',
        'views',
        'block',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * A user with permission to bypass access content.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $adminUser;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalPlaceBlock('system_breadcrumb_block');
        $this->drupalPlaceBlock('page_title_block');
        $this->adminUser = $this->drupalCreateUser([
            'administer nodes',
            'create article content',
            'create page content',
            'post comments',
        ]);
        $this->drupalLogin($this->adminUser);
        $this->addDefaultCommentField('node', 'page');
    }
    
    /**
     * Creates one node and tests if the node title has the correct value.
     */
    public function testNodeTitle() {
        // Create "Basic page" content with title.
        // Add the node to the frontpage so we can test if teaser links are
        // clickable.
        $settings = [
            'title' => $this->randomMachineName(8),
            'promote' => 1,
        ];
        $node = $this->drupalCreateNode($settings);
        // Test <title> tag.
        $this->drupalGet('node/' . $node->id());
        $this->assertSession()
            ->elementTextEquals('xpath', '//title', $node->label() . ' | Drupal');
        // Test breadcrumb in comment preview.
        $this->assertBreadcrumb('comment/reply/node/' . $node->id() . '/comment', [
            '' => 'Home',
            'node/' . $node->id() => $node->label(),
        ]);
        // Verify that node preview title is equal to node title.
        $this->assertSession()
            ->elementTextEquals('xpath', "//article/h2/a/span", $node->label());
        // Test node title is clickable on teaser list (/node).
        $this->drupalGet('node');
        $this->clickLink($node->label());
        // Test edge case where node title is set to 0.
        $settings = [
            'title' => 0,
        ];
        $node = $this->drupalCreateNode($settings);
        // Test that 0 appears as <title>.
        $this->drupalGet('node/' . $node->id());
        $this->assertSession()
            ->titleEquals('0 | Drupal');
        // Test that 0 appears in the template <h1>.
        $this->assertSession()
            ->elementTextEquals('xpath', '//h1', '0');
        // Test edge case where node title contains special characters.
        $edge_case_title = 'article\'s "title".';
        $settings = [
            'title' => $edge_case_title,
        ];
        $node = $this->drupalCreateNode($settings);
        // Test that the title appears as <title>. The title will be escaped on the
        // the page.
        $edge_case_title_escaped = Html::escape($edge_case_title);
        $this->drupalGet('node/' . $node->id());
        $this->assertSession()
            ->responseContains('<title>' . $edge_case_title_escaped . ' | Drupal</title>');
        // Test that the title appears as <title> when reloading the node page.
        $this->drupalGet('node/' . $node->id());
        $this->assertSession()
            ->responseContains('<title>' . $edge_case_title_escaped . ' | Drupal</title>');
    }

}