class SortRandomTest

class SortRandomTest extends ViewsKernelTestBase {
    
    /**
     * Views used by this test.
     *
     * @var array
     */
    public static $testViews = [
        'test_view',
    ];
    
    /**
     * Add more items to the test set, to make the order tests more robust.
     *
     * In total we have then 60 entries, which makes a probability of a collision
     * of 1/60!, which is around 1/1E80, which is higher than the estimated amount
     * of protons / electrons in the observable universe, also called the
     * eddington number.
     *
     * @see http://wikipedia.org/wiki/Eddington_number
     */
    protected function dataSet() {
        $data = parent::dataSet();
        for ($i = 0; $i < 55; $i++) {
            $data[] = [
                'name' => 'name_' . $i,
                'age' => $i,
                'job' => 'job_' . $i,
                'created' => rand(0, time()),
                'status' => 1,
            ];
        }
        return $data;
    }
    
    /**
     * Return a basic view with random ordering.
     */
    protected function getBasicRandomView() {
        $view = Views::getView('test_view');
        $view->setDisplay();
        // Add a random ordering.
        $view->displayHandlers
            ->get('default')
            ->overrideOption('sorts', [
            'random' => [
                'id' => 'random',
                'field' => 'random',
                'table' => 'views',
            ],
        ]);
        return $view;
    }
    
    /**
     * Tests random ordering of the result set.
     *
     * @see DatabaseSelectTestCase::testRandomOrder()
     */
    public function testRandomOrdering() {
        // Execute a basic view first.
        $view = Views::getView('test_view');
        $this->executeView($view);
        // Verify the result.
        $this->assertEqual(count($this->dataSet()), count($view->result), 'The number of returned rows match.');
        $this->assertIdenticalResultset($view, $this->dataSet(), [
            'views_test_data_name' => 'name',
            'views_test_data_age' => 'age',
        ]);
        // Execute a random view, we expect the result set to be different.
        $view_random = $this->getBasicRandomView();
        $this->executeView($view_random);
        $this->assertEqual(count($this->dataSet()), count($view_random->result), 'The number of returned rows match.');
        $this->assertNotIdenticalResultset($view_random, $view->result, [
            'views_test_data_name' => 'views_test_data_name',
            'views_test_data_age' => 'views_test_data_name',
        ]);
        // Execute a second random view, we expect the result set to be different again.
        $view_random_2 = $this->getBasicRandomView();
        $this->executeView($view_random_2);
        $this->assertEqual(count($this->dataSet()), count($view_random_2->result), 'The number of returned rows match.');
        $this->assertNotIdenticalResultset($view_random, $view->result, [
            'views_test_data_name' => 'views_test_data_name',
            'views_test_data_age' => 'views_test_data_name',
        ]);
    }
    
    /**
     * Tests random ordering with tags based caching.
     *
     * The random sorting should opt out of caching by defining a max age of 0.
     * At the same time, the row render caching still works.
     */
    public function testRandomOrderingWithRenderCaching() {
        $view_random = $this->getBasicRandomView();
        $display =& $view_random->storage
            ->getDisplay('default');
        $display['display_options']['cache'] = [
            'type' => 'tag',
        ];
        $view_random->storage
            ->save();
        
        /** @var \Drupal\Core\Render\RendererInterface $renderer */
        $renderer = \Drupal::service('renderer');
        
        /** @var \Drupal\Core\Render\RenderCacheInterface $render_cache */
        $render_cache = \Drupal::service('render_cache');
        $original = $build = DisplayPluginBase::buildBasicRenderable($view_random->id(), 'default');
        $result = $renderer->renderPlain($build);
        $original['#cache'] += [
            'contexts' => [],
        ];
        $original['#cache']['contexts'] = Cache::mergeContexts($original['#cache']['contexts'], $this->container
            ->getParameter('renderer.config')['required_cache_contexts']);
        $this->assertFalse($render_cache->get($original), 'Ensure there is no render cache entry.');
        $build = DisplayPluginBase::buildBasicRenderable($view_random->id(), 'default');
        $result2 = $renderer->renderPlain($build);
        // Ensure that the random ordering works and don't produce the same result.
        $this->assertNotEqual($result, $result2);
    }

}