class CommentDefaultFormatterCacheTagsTest

class CommentDefaultFormatterCacheTagsTest extends EntityKernelTestBase {
    use CommentTestTrait;
    
    /**
     * Modules to install.
     *
     * @var array
     */
    public static $modules = [
        'entity_test',
        'comment',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        $session = new Session();
        $request = Request::create('/');
        $request->setSession($session);
        
        /** @var \Symfony\Component\HttpFoundation\RequestStack $stack */
        $stack = $this->container
            ->get('request_stack');
        $stack->pop();
        $stack->push($request);
        // Set the current user to one that can access comments. Specifically, this
        // user does not have access to the 'administer comments' permission, to
        // ensure only published comments are visible to the end user.
        $current_user = $this->container
            ->get('current_user');
        $current_user->setAccount($this->createUser([], [
            'access comments',
        ]));
        // Install tables and config needed to render comments.
        $this->installSchema('comment', [
            'comment_entity_statistics',
        ]);
        $this->installConfig([
            'system',
            'filter',
            'comment',
        ]);
        // Comment rendering generates links, so build the router.
        $this->container
            ->get('router.builder')
            ->rebuild();
        // Set up a field, so that the entity that'll be referenced bubbles up a
        // cache tag when rendering it entirely.
        $this->addDefaultCommentField('entity_test', 'entity_test');
    }
    
    /**
     * Tests the bubbling of cache tags.
     */
    public function testCacheTags() {
        
        /** @var \Drupal\Core\Render\RendererInterface $renderer */
        $renderer = $this->container
            ->get('renderer');
        // Create the entity that will be commented upon.
        $commented_entity = EntityTest::create([
            'name' => $this->randomMachineName(),
        ]);
        $commented_entity->save();
        // Verify cache tags on the rendered entity before it has comments.
        $build = \Drupal::entityTypeManager()->getViewBuilder('entity_test')
            ->view($commented_entity);
        $renderer->renderRoot($build);
        $expected_cache_tags = [
            'entity_test_view',
            'entity_test:' . $commented_entity->id(),
            'config:core.entity_form_display.comment.comment.default',
            'config:field.field.comment.comment.comment_body',
            'config:field.field.entity_test.entity_test.comment',
            'config:field.storage.comment.comment_body',
            'config:user.settings',
        ];
        sort($expected_cache_tags);
        $this->assertEqual($build['#cache']['tags'], $expected_cache_tags);
        // Create a comment on that entity. Comment loading requires that the uid
        // also exists in the {users} table.
        $user = $this->createUser();
        $user->save();
        $comment = Comment::create([
            'subject' => 'Llama',
            'comment_body' => [
                'value' => 'Llamas are cool!',
                'format' => 'plain_text',
            ],
            'entity_id' => $commented_entity->id(),
            'entity_type' => 'entity_test',
            'field_name' => 'comment',
            'comment_type' => 'comment',
            'status' => CommentInterface::PUBLISHED,
            'uid' => $user->id(),
        ]);
        $comment->save();
        // Load commented entity so comment_count gets computed.
        // @todo Remove the $reset = TRUE parameter after
        //   https://www.drupal.org/node/597236 lands. It's a temporary work-around.
        $storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('entity_test');
        $storage->resetCache([
            $commented_entity->id(),
        ]);
        $commented_entity = $storage->load($commented_entity->id());
        // Verify cache tags on the rendered entity when it has comments.
        $build = \Drupal::entityTypeManager()->getViewBuilder('entity_test')
            ->view($commented_entity);
        $renderer->renderRoot($build);
        $expected_cache_tags = [
            'entity_test_view',
            'entity_test:' . $commented_entity->id(),
            'comment_view',
            'comment:' . $comment->id(),
            'config:filter.format.plain_text',
            'user_view',
            'user:2',
            'config:core.entity_form_display.comment.comment.default',
            'config:field.field.comment.comment.comment_body',
            'config:field.field.entity_test.entity_test.comment',
            'config:field.storage.comment.comment_body',
            'config:user.settings',
        ];
        sort($expected_cache_tags);
        $this->assertEqual($build['#cache']['tags'], $expected_cache_tags);
        // Build a render array with the entity in a sub-element so that lazy
        // builder elements bubble up outside of the entity and we can check that
        // it got the correct cache max age.
        $build = [
            '#type' => 'container',
        ];
        $build['entity'] = \Drupal::entityTypeManager()->getViewBuilder('entity_test')
            ->view($commented_entity);
        $renderer->renderRoot($build);
        // The entity itself was cached but the top-level element is max-age 0 due
        // to the bubbled up max age due to the lazy-built comment form.
        $this->assertIdentical(Cache::PERMANENT, $build['entity']['#cache']['max-age']);
        $this->assertIdentical(0, $build['#cache']['max-age'], 'Top level render array has max-age 0');
        // The children (fields) of the entity render array are only built in case
        // of a cache miss.
        $this->assertFalse(isset($build['entity']['comment']), 'Cache hit');
    }

}