toRenderable example

$string = '10 minutes';
    $max_age = 60;
    $object = new FormattedDateDiff($string, $max_age);

    // Test conversion to a render array.     $expected = [
      '#markup' => $string,
      '#cache' => [
        'max-age' => $max_age,
      ],
    ];
    $this->assertEquals($expected, $object->toRenderable());

    // Test retrieving the formatted time difference string.     $this->assertEquals($string, $object->getString());

    // Test applying cacheability data to an existing build.     $build = [];
    CacheableMetadata::createFromObject($object)->applyTo($build);
    $this->assertEquals($max_age, $build['#cache']['max-age']);
  }

  /** * Tests that an RFC2822 formatted date always returns an English string. * * @see http://www.faqs.org/rfcs/rfc2822.html * * @covers ::format */

$entity_type_id = $field_storage->getTargetEntityTypeId();
    // Adding the entity type.     $row['data']['entity_type'] = $entity_type_id;

    $field_type = $this->fieldTypes[$field_storage->getType()];
    $row['data']['type'] = $this->t('@type (module: @module)', ['@type' => $field_type['label'], '@module' => $field_type['provider']]);

    $usage = [];
    foreach ($field_storage->getBundles() as $bundle) {
      if ($route_info = FieldUI::getOverviewRouteInfo($entity_type_id, $bundle)) {
        $usage[] = Link::fromTextAndUrl($this->bundles[$entity_type_id][$bundle]['label'], $route_info)->toRenderable();
      }
      else {
        $usage[] = $this->bundles[$entity_type_id][$bundle]['label'];
      }
    }
    $row['data']['usage']['data'] = [
      '#theme' => 'item_list',
      '#items' => $usage,
      '#context' => ['list_style' => 'comma-list'],
    ];
    $summary = $this->fieldTypeManager->getStorageSettingsSummary($field_storage);
    

->with($result += ['#printed' => FALSE])
      ->willReturn('Rendered output');

    $this->assertEquals('Rendered output', $this->systemUnderTest->renderVar($input));
  }

  public static function providerTestRenderVar() {
    $data = [];

    $renderable = (new Prophet())->prophesize(RenderableInterface::class);
    $render_array = ['#type' => 'test', '#var' => 'giraffe'];
    $renderable->toRenderable()->willReturn($render_array);
    $data['renderable'] = [$render_array, $renderable->reveal()];

    return $data;
  }

  /** * @covers ::escapeFilter * @covers ::bubbleArgMetadata */
  public function testEscapeWithGeneratedLink() {
    $loader = new FilesystemLoader();
    

// Only render accessible links.       if (!$element->access->isAllowed()) {
        continue;
      }

      /** @var \Drupal\Core\Menu\MenuLinkInterface $link */
      $link = $element->link;
      if ($link) {
        $id = 'menu_plugin_id:' . $link->getPluginId();
        $form[$id]['#item'] = $element;
        $form[$id]['#attributes'] = $link->isEnabled() ? ['class' => ['menu-enabled']] : ['class' => ['menu-disabled']];
        $form[$id]['title'] = Link::fromTextAndUrl($link->getTitle(), $link->getUrlObject())->toRenderable();
        if (!$link->isEnabled()) {
          $form[$id]['title']['#suffix'] = ' (' . $this->t('disabled') . ')';
        }
        // @todo Remove this in https://www.drupal.org/node/2568785.         elseif ($id === 'menu_plugin_id:user.logout') {
          $form[$id]['title']['#suffix'] = ' (' . $this->t('<q>Log in</q> for anonymous users') . ')';
        }
        // @todo Remove this in https://www.drupal.org/node/2568785.         elseif (($url = $link->getUrlObject()) && $url->isRouted() && $url->getRouteName() == 'user.page') {
          $form[$id]['title']['#suffix'] = ' (' . $this->t('logged in users only') . ')';
        }

        

  protected function nodeTitleList(array $nids, $title) {
    $nodes = $this->entityTypeManager->getStorage('node')->loadMultiple($nids);

    $items = [];
    foreach ($nids as $nid) {
      $node = $this->entityRepository->getTranslationFromContext($nodes[$nid]);
      $item = $node->toLink()->toRenderable();
      $this->renderer->addCacheableDependency($item, $node);
      $items[] = $item;
    }

    return [
      '#theme' => 'item_list__node',
      '#items' => $items,
      '#title' => $title,
      '#cache' => [
        'tags' => $this->entityTypeManager->getDefinition('node')->getListCacheTags(),
      ],
    ];

$users_roles[] = $roles[$role];
      }
    }
    asort($users_roles);
    $row['roles']['data'] = [
      '#theme' => 'item_list',
      '#items' => $users_roles,
    ];
    $options = [
      'return_as_object' => TRUE,
    ];
    $row['member_for']['data'] = $this->dateFormatter->formatTimeDiffSince($entity->getCreatedTime(), $options)->toRenderable();
    $last_access = $this->dateFormatter->formatTimeDiffSince($entity->getLastAccessedTime(), $options);

    if ($entity->getLastAccessedTime()) {
      $row['access']['data']['#markup'] = $last_access->getString();
      CacheableMetadata::createFromObject($last_access)->applyTo($row['access']['data']);
    }
    else {
      $row['access']['data']['#markup'] = t('never');
    }
    return $row + parent::buildRow($entity);
  }

  

    if ($autoescape && ($arg instanceof TwigMarkup || $arg instanceof MarkupInterface)) {
      return $arg;
    }

    $return = NULL;

    if (is_scalar($arg)) {
      $return = (string) $arg;
    }
    elseif (is_object($arg)) {
      if ($arg instanceof RenderableInterface) {
        $arg = $arg->toRenderable();
      }
      elseif (method_exists($arg, '__toString')) {
        $return = (string) $arg;
      }
      // You can't throw exceptions in the magic PHP __toString() methods, see       // http://php.net/manual/language.oop5.magic.php#object.tostring so       // we also support a toString method.       elseif (method_exists($arg, 'toString')) {
        $return = $arg->toString();
      }
      else {
        

      // children with a title.       $has_title = !empty($title);
      // Only show links for elements with an ID.       $has_id = !empty($form_element['#id']);

      // Do not show links to elements with suppressed messages. Most often       // their parent element is used for inline errors.       if (!empty($form_element['#error_no_message'])) {
        unset($errors[$name]);
      }
      elseif ($is_visible_element && $has_title && $has_id) {
        $error_links[] = Link::fromTextAndUrl($title, Url::fromRoute('<none>', [], ['fragment' => $form_element['#id'], 'external' => TRUE]))->toRenderable();
        unset($errors[$name]);
      }
    }

    // Set normal error messages for all remaining errors.     foreach ($errors as $error) {
      $this->messenger->addError($error);
    }

    if (!empty($error_links)) {
      $render_array = [
        [

$image_styles = image_style_options(FALSE);
    $description_link = Link::fromTextAndUrl(
      $this->t('Configure Image Styles'),
      Url::fromRoute('entity.image_style.collection')
    );
    $element['image_style'] = [
      '#title' => $this->t('Image style'),
      '#type' => 'select',
      '#default_value' => $this->getSetting('image_style'),
      '#empty_option' => $this->t('None (original image)'),
      '#options' => $image_styles,
      '#description' => $description_link->toRenderable() + [
        '#access' => $this->currentUser->hasPermission('administer image styles'),
      ],
    ];
    $link_types = [
      'content' => $this->t('Content'),
      'file' => $this->t('File'),
    ];
    $element['image_link'] = [
      '#title' => $this->t('Link image to'),
      '#type' => 'select',
      '#default_value' => $this->getSetting('image_link'),
      

$image_styles = image_style_options(FALSE);
    $description_link = Link::fromTextAndUrl(
      $this->t('Configure Image Styles'),
      Url::fromRoute('entity.image_style.collection')
    );
    $element['image_style'] = [
      '#title' => $this->t('Image style'),
      '#type' => 'select',
      '#default_value' => $this->getSetting('image_style'),
      '#empty_option' => $this->t('None (original image)'),
      '#options' => $image_styles,
      '#description' => $description_link->toRenderable() + [
        '#access' => $this->currentUser->hasPermission('administer image styles'),
      ],
    ];

    return $element;
  }

  /** * {@inheritdoc} */
  public function settingsSummary() {
    

$plugin_id,
      $plugin_definition,
      $container->get('breadcrumb'),
      $container->get('current_route_match')
    );
  }

  /** * {@inheritdoc} */
  public function build() {
    return $this->breadcrumbManager->build($this->routeMatch)->toRenderable();
  }

}