diff core/tests/Drupal/Tests/EntityViewTrait.php @ 0:c75dbcec494b

Initial commit from drush-created site

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/tests/Drupal/Tests/EntityViewTrait.php	Thu Jul 05 14:24:15 2018 +0000
@@ -0,0 +1,71 @@
+<?php
+
+namespace Drupal\Tests;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Render\Element;
+
+/**
+ * Provides helper methods to deal with building entity views in tests.
+ */
+trait EntityViewTrait {
+
+  /**
+   * Builds the renderable view of an entity.
+   *
+   * Entities postpone the composition of their renderable arrays to #pre_render
+   * functions in order to maximize cache efficacy. This means that the full
+   * renderable array for an entity is constructed in drupal_render(). Some
+   * tests require the complete renderable array for an entity outside of the
+   * drupal_render process in order to verify the presence of specific values.
+   * This method isolates the steps in the render process that produce an
+   * entity's renderable array.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity to prepare a renderable array for.
+   * @param string $view_mode
+   *   (optional) The view mode that should be used to build the entity.
+   * @param null $langcode
+   *   (optional) For which language the entity should be prepared, defaults to
+   *   the current content language.
+   * @param bool $reset
+   *   (optional) Whether to clear the cache for this entity.
+   * @return array
+   *
+   * @see \Drupal\Core\Render\RendererInterface::render()
+   */
+  protected function buildEntityView(EntityInterface $entity, $view_mode = 'full', $langcode = NULL, $reset = FALSE) {
+    $ensure_fully_built = function (&$elements) use (&$ensure_fully_built) {
+      // If the default values for this element have not been loaded yet, populate
+      // them.
+      if (isset($elements['#type']) && empty($elements['#defaults_loaded'])) {
+        $elements += \Drupal::service('element_info')->getInfo($elements['#type']);
+      }
+
+      // Make any final changes to the element before it is rendered. This means
+      // that the $element or the children can be altered or corrected before the
+      // element is rendered into the final text.
+      if (isset($elements['#pre_render'])) {
+        foreach ($elements['#pre_render'] as $callable) {
+          $elements = call_user_func($callable, $elements);
+        }
+      }
+
+      // And recurse.
+      $children = Element::children($elements, TRUE);
+      foreach ($children as $key) {
+        $ensure_fully_built($elements[$key]);
+      }
+    };
+
+    $render_controller = $this->container->get('entity.manager')->getViewBuilder($entity->getEntityTypeId());
+    if ($reset) {
+      $render_controller->resetCache([$entity->id()]);
+    }
+    $build = $render_controller->view($entity, $view_mode, $langcode);
+    $ensure_fully_built($build);
+
+    return $build;
+  }
+
+}