class PreprocessPagerTest

class PreprocessPagerTest extends UnitTestCase {
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $pager_manager = $this->getMockBuilder('Drupal\\Core\\Pager\\PagerManager')
      ->disableOriginalConstructor()
      ->getMock();
    $pager = $this->getMockBuilder('Drupal\\Core\\Pager\\Pager')
      ->disableOriginalConstructor()
      ->getMock();
    $url_generator = $this->getMockBuilder('Drupal\\Core\\Routing\\UrlGenerator')
      ->disableOriginalConstructor()
      ->getMock();
    $pager->method('getTotalPages')
      ->willReturn(2);
    $pager->method('getCurrentPage')
      ->willReturn(1);
    $url_generator->method('generateFromRoute')
      ->willReturn('');
    $pager_manager->method('getPager')
      ->willReturn($pager);
    $pager_manager->method('getUpdatedParameters')
      ->willReturn('');
    $container = new ContainerBuilder();
    $container->set('pager.manager', $pager_manager);
    $container->set('url_generator', $url_generator);
    \Drupal::setContainer($container);
  }
  
  /**
   * Tests template_preprocess_pager() when an empty #quantity is passed.
   *
   * @covers ::template_preprocess_pager
   */
  public function testQuantityNotSet() {
    require_once $this->root . '/core/includes/theme.inc';
    $variables = [
      'pager' => [
        '#element' => '',
        '#parameters' => [],
        '#quantity' => '',
        '#route_name' => '',
        '#tags' => '',
      ],
    ];
    template_preprocess_pager($variables);
    $this->assertEquals([
      'first',
      'previous',
    ], array_keys($variables['items']));
  }

}