Simpletest

gistfile1.php

    // Create a promoted node to test the <title> tag on the frontpage view.
    \Drupal::config('system.site')->set('page.front', 'node')->save();
    $this->drupalCreateNode(array('type' => 'article', 'promote' => 1));
    $this->drupalGet('');
    $this->assertTitle('Home | ' . $this->container->get('config.factory')->get('system.site')->get('name'));