InstallerPerformanceTest.php

<?php

namespace Drupal\FunctionalTests\Installer;

use Drupal\Core\Routing\RoutingEvents;
use Drupal\Core\Test\PerformanceTestRecorder;
use Drupal\Tests\BrowserTestBase;

/**
 * Tests the interactive installer.
 *
 * @group Installer
 */
class InstallerPerformanceTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected $profile = 'testing';
    
    /**
     * {@inheritdoc}
     */
    protected function prepareSettings() {
        parent::prepareSettings();
        PerformanceTestRecorder::registerService($this->siteDirectory . '/services.yml', FALSE);
    }
    
    /**
     * Ensures that the user page is available after installation.
     */
    public function testInstaller() {
        // Ensures that router is not rebuilt unnecessarily during the install.
        // Currently it is built once during the install in install_finished().
        $this->assertSame(1, \Drupal::service('core.performance.test.recorder')->getCount('event', RoutingEvents::FINISHED));
    }

}