class StatisticsAttachedTest

class StatisticsAttachedTest extends BrowserTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'node',
    'statistics',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->drupalCreateContentType([
      'type' => 'page',
    ]);
    // Install "statistics_test_attached" and set it as the default theme.
    $theme = 'statistics_test_attached';
    \Drupal::service('theme_installer')->install([
      $theme,
    ]);
    $this->config('system.theme')
      ->set('default', $theme)
      ->save();
    // Installing a theme will cause the kernel terminate event to rebuild the
    // router. Simulate that here.
    \Drupal::service('router.builder')->rebuildIfNeeded();
  }
  
  /**
   * Tests if statistics.js is loaded when content is not printed.
   */
  public function testAttached() {
    $node = Node::create([
      'type' => 'page',
      'title' => 'Page node',
      'body' => 'body text',
    ]);
    $node->save();
    $this->drupalGet('node/' . $node->id());
    $this->assertSession()
      ->responseContains('core/modules/statistics/statistics.js');
  }

}