trait AssertViewsCacheTagsTrait

trait AssertViewsCacheTagsTrait {
    
    /**
     * Asserts a view's result & render cache items' cache tags.
     *
     * This methods uses a full view object in order to render the view.
     *
     * @param \Drupal\views\ViewExecutable $view
     *   The view to test, must have caching enabled.
     * @param null|string[] $expected_results_cache
     *   NULL when expecting no results cache item, a set of cache tags expected
     *   to be set on the results cache item otherwise.
     * @param bool $views_caching_is_enabled
     *   Whether to expect an output cache item. If TRUE, the cache tags must
     *   match those in $expected_render_array_cache_tags.
     * @param string[] $expected_render_array_cache_tags
     *   A set of cache tags expected to be set on the built view's render array.
     *
     * @return array
     *   The render array.
     */
    protected function assertViewsCacheTags(ViewExecutable $view, $expected_results_cache, $views_caching_is_enabled, array $expected_render_array_cache_tags) {
        
        /** @var \Drupal\Core\Render\RendererInterface $renderer */
        $renderer = \Drupal::service('renderer');
        
        /** @var \Drupal\Core\Render\RenderCacheInterface $render_cache */
        $render_cache = \Drupal::service('render_cache');
        $build = $view->buildRenderable();
        $original = $build;
        // Ensure the current request is a GET request so that render caching is
        // active for direct rendering of views, just like for actual requests.
        
        /** @var \Symfony\Component\HttpFoundation\RequestStack $request_stack */
        $request_stack = \Drupal::service('request_stack');
        $request = Request::createFromGlobals();
        $request->server
            ->set('REQUEST_TIME', \Drupal::time()->getRequestTime());
        $request->setSession(new Session(new MockArraySessionStorage()));
        $view->setRequest($request);
        $request_stack->push($request);
        $renderer->renderRoot($build);
        // Check render array cache tags.
        sort($expected_render_array_cache_tags);
        $this->assertEqualsCanonicalizing($expected_render_array_cache_tags, $build['#cache']['tags']);
        if ($views_caching_is_enabled) {
            // Check Views render cache item cache tags.
            
            /** @var \Drupal\views\Plugin\views\cache\CachePluginBase $cache_plugin */
            $cache_plugin = $view->display_handler
                ->getPlugin('cache');
            // Results cache.
            // Ensure that the views query is built.
            $view->build();
            $results_cache_item = \Drupal::cache('data')->get($cache_plugin->generateResultsKey());
            if (is_array($expected_results_cache)) {
                $this->assertNotEmpty($results_cache_item, 'Results cache item found.');
                if ($results_cache_item) {
                    $this->assertEqualsCanonicalizing($expected_results_cache, $results_cache_item->tags);
                }
            }
            else {
                $this->assertNull($results_cache_item, 'Results cache item not found.');
            }
            // Check Views render cache item cache tags.
            $original['#cache'] += [
                'contexts' => [],
            ];
            $original['#cache']['contexts'] = Cache::mergeContexts($original['#cache']['contexts'], $this->container
                ->getParameter('renderer.config')['required_cache_contexts']);
            $render_cache_item = $render_cache->get($original);
            if ($views_caching_is_enabled === TRUE) {
                $this->assertNotEmpty($render_cache_item, 'Render cache item found.');
                if ($render_cache_item) {
                    $this->assertEqualsCanonicalizing($expected_render_array_cache_tags, $render_cache_item['#cache']['tags']);
                }
            }
            else {
                $this->assertNull($render_cache_item, 'Render cache item not found.');
            }
        }
        $view->destroy();
        $request_stack->pop();
        return $build;
    }
    
    /**
     * Asserts a view's result & render cache items' cache tags.
     *
     * This method starts with a pre bubbling basic render array.
     *
     * @param \Drupal\views\ViewExecutable $view
     *   The view.
     * @param string[] $expected_render_array_cache_tags
     *   The expected render cache tags.
     * @param bool $views_caching_is_enabled
     *   Defines whether views output / render caching is enabled.
     *
     * @return array
     *   The render array.
     */
    protected function assertViewsCacheTagsFromStaticRenderArray(ViewExecutable $view, array $expected_render_array_cache_tags, $views_caching_is_enabled) {
        $original = $build = DisplayPluginBase::buildBasicRenderable($view->id(), $view->current_display ?: 'default', $view->args);
        
        /** @var \Drupal\Core\Render\RendererInterface $renderer */
        $renderer = \Drupal::service('renderer');
        
        /** @var \Drupal\Core\Render\RenderCacheInterface $render_cache */
        $render_cache = \Drupal::service('render_cache');
        // Ensure the current request is a GET request so that render caching is
        // active for direct rendering of views, just like for actual requests.
        
        /** @var \Symfony\Component\HttpFoundation\RequestStack $request_stack */
        $request_stack = \Drupal::service('request_stack');
        $request = new Request();
        $request->server
            ->set('REQUEST_TIME', \Drupal::time()->getRequestTime());
        $request->setSession(new Session(new MockArraySessionStorage()));
        $request_stack->push($request);
        $renderer->renderRoot($build);
        // Check render array cache tags.
        $this->assertEqualsCanonicalizing($expected_render_array_cache_tags, $build['#cache']['tags']);
        // Check Views render cache item cache tags.
        $original['#cache'] += [
            'contexts' => [],
        ];
        $original['#cache']['contexts'] = Cache::mergeContexts($original['#cache']['contexts'], $this->container
            ->getParameter('renderer.config')['required_cache_contexts']);
        $render_cache_item = $render_cache->get($original);
        if ($views_caching_is_enabled) {
            $this->assertNotEmpty($render_cache_item, 'Render cache item found.');
            if ($render_cache_item) {
                $this->assertEqualsCanonicalizing($expected_render_array_cache_tags, $render_cache_item['#cache']['tags']);
            }
        }
        else {
            $this->assertFalse($render_cache_item, 'Render cache item not found.');
        }
        return $build;
    }

}