Issue #3266341 by nlisgo, cilefen, carstenG, david.qdoscc, Lendude, quietone,...

    if ($this->itemsPerPageExposed()) {

      $query = $this->view->getRequest()->query;

      $items_per_page = $query->get('items_per_page');

      if ($items_per_page > 0) {

      if ((int) $items_per_page > 0) {

        $this->options['items_per_page'] = $items_per_page;

      }

      elseif ($items_per_page == 'All' && $this->options['expose']['items_per_page_options_all']) {

<?php

namespace Drupal\Tests\views\Unit\Plugin\pager;

use Drupal\Core\DependencyInjection\ContainerBuilder;

use Drupal\Tests\UnitTestCase;

use Drupal\views\Plugin\views\query\QueryPluginBase;

use Symfony\Component\HttpFoundation\Request;

/**

 * @coversDefaultClass \Drupal\views\Plugin\views\pager\SqlBase

 * @group views

 */

class SqlBaseTest extends UnitTestCase {

  /**

   * The mock pager plugin instance.

   *

   * @var \Drupal\views\Plugin\views\pager\SqlBase|\PHPUnit\Framework\MockObject\MockObject

   */

  protected $pager;

  /**

   * The mock view instance.

   *

   * @var \Drupal\views\ViewExecutable|\PHPUnit\Framework\MockObject\MockObject

   */

  protected $view;

  /**

   * The mock display plugin instance.

   *

   * @var \Drupal\views\Plugin\views\display\DisplayPluginBase|\PHPUnit\Framework\MockObject\MockObject

   */

  protected $display;

  protected function setUp(): void {

    $this->pager = $this->getMockBuilder('Drupal\views\Plugin\views\pager\SqlBase')

      ->disableOriginalConstructor()

      ->getMockForAbstractClass();

    /** @var \Drupal\views\ViewExecutable|\PHPUnit\Framework\MockObject\MockObject $view */

    $this->view = $this->getMockBuilder('Drupal\views\ViewExecutable')

      ->disableOriginalConstructor()

      ->getMock();

    $query = $this->getMockBuilder(QueryPluginBase::class)

      ->disableOriginalConstructor()

      ->getMock();

    $this->view->query = $query;

    $this->display = $this->getMockBuilder('Drupal\views\Plugin\views\display\DisplayPluginBase')

      ->disableOriginalConstructor()

      ->getMock();

    $container = new ContainerBuilder();

    $container->set('string_translation', $this->getStringTranslationStub());

    \Drupal::setContainer($container);

  }

  /**

   * Tests the query() method.

   *

   * @see \Drupal\views\Plugin\views\pager\SqlBase::query()

   */

  public function testQuery() {

    $request = new Request([

      'items_per_page' => 'All',

    ]);

    $this->view->expects($this->any())

      ->method('getRequest')

      ->will($this->returnValue($request));

    $options = [];

    $this->pager->init($this->view, $this->display, $options);

    $this->pager->query();

    $this->assertSame(10, $this->pager->options['items_per_page']);

    $options = [

      'expose' => [

        'items_per_page' => TRUE,

        'items_per_page_options_all' => TRUE,

      ],

    ];

    $this->pager->init($this->view, $this->display, $options);

    $this->pager->query();

    $this->assertSame(0, $this->pager->options['items_per_page']);

  }

}