Issue #3094536 by stefanos.petrakis, mcdruid, alexpott: PHP 7.1 Warning: A...

function template_preprocess_pager(&$variables) {

  $element = $variables['pager']['#element'];

  $parameters = $variables['pager']['#parameters'];

  $quantity = $variables['pager']['#quantity'];

  $quantity = empty($variables['pager']['#quantity']) ? 0 : $variables['pager']['#quantity'];

  $route_name = $variables['pager']['#route_name'];

  $route_parameters = isset($variables['pager']['#route_parameters']) ? $variables['pager']['#route_parameters'] : [];

<?php

namespace Drupal\Tests\system\Unit\Pager;

use Drupal\Core\DependencyInjection\ContainerBuilder;

use Drupal\Tests\UnitTestCase;

/**

 * Tests pager preprocessing.

 *

 * @group system

 */

class PreprocessPagerTest extends UnitTestCase {

  /**

   * {@inheritdoc}

   */

  protected function setUp() {

    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/pager.inc';

    $variables = [

      'pager' => [

        '#element' => '',

        '#parameters' => [],

        '#quantity' => '',

        '#route_name' => '',

        '#tags' => '',

      ],

    ];

    template_preprocess_pager($variables);

    $this->assertEquals(['first', 'previous'], array_keys($variables['items']));

  }

}