NodeTitleTestBase.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\system\Functional\Theme;

use Drupal\Tests\node\Functional\NodeTestBase;

/**
 * Tests node title for a theme.
 */
abstract class NodeTitleTestBase extends NodeTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'block',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->drupalPlaceBlock('page_title_block');
    $adminUser = $this->drupalCreateUser([
      'administer themes',
      'administer nodes',
      'create article content',
      'create page content',
    ]);
    $this->drupalLogin($adminUser);
  }
  
  /**
   * Get the theme name.
   *
   * @return string
   *   The theme to test.
   */
  protected function getTheme() : string {
    return explode('\\', get_class($this))[2];
  }
  
  /**
   * Creates one node with title 0 and tests if the node title has the correct value.
   */
  public function testNodeWithTitle0() : void {
    $theme = $this->getTheme();
    if ($theme !== $this->defaultTheme) {
      $system_theme_config = $this->container
        ->get('config.factory')
        ->getEditable('system.theme');
      $system_theme_config->set('default', $theme)
        ->save();
      \Drupal::service('theme_installer')->install([
        $theme,
      ]);
    }
    // Create "Basic page" content with title 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');
  }

}