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');
    }

}