diff --git a/core/modules/simpletest/simpletest.module b/core/modules/simpletest/simpletest.module
index 3b46028..bc43a4b 100644
--- a/core/modules/simpletest/simpletest.module
+++ b/core/modules/simpletest/simpletest.module
@@ -329,6 +329,7 @@ function _simpletest_batch_operation($test_list_init, $test_id, &$context) {
   \Drupal::moduleHandler()->invokeAll('test_finished', array($test->results));
 
   // Gather results and compose the report.
+  $renderer = \Drupal::service('renderer');
   $test_results[$test_class] = $test->results;
   foreach ($test_results[$test_class] as $key => $value) {
     $test_results[$key] += $value;
@@ -340,20 +341,20 @@ function _simpletest_batch_operation($test_list_init, $test_id, &$context) {
       '#theme' => 'simpletest_result_summary',
       '#label' => t($test_results[$class]['#name'] . ':'),
     );
-    array_unshift($items, drupal_render($class_test_result));
+    array_unshift($items, $renderer->render($class_test_result));
   }
   $context['message'] = t('Processed test @num of @max - %test.', array('%test' => $info['name'], '@num' => $max - $size, '@max' => $max));
   $overall_results = $test_results + array(
     '#theme' => 'simpletest_result_summary',
     '#label' => t('Overall results:'),
   );
-  $context['message'] .= drupal_render($overall_results);
+  $context['message'] .= $renderer->render($overall_results);
 
   $item_list = array(
     '#theme' => 'item_list',
     '#items' => $items,
   );
-  $context['message'] .= drupal_render($item_list);
+  $context['message'] .= $renderer->render($item_list);
 
   // Save working values for the next iteration.
   $context['sandbox']['tests'] = $test_list;
diff --git a/core/modules/simpletest/src/Form/SimpletestResultsForm.php b/core/modules/simpletest/src/Form/SimpletestResultsForm.php
index 9ddc451..9f077b3 100644
--- a/core/modules/simpletest/src/Form/SimpletestResultsForm.php
+++ b/core/modules/simpletest/src/Form/SimpletestResultsForm.php
@@ -43,11 +43,21 @@ class SimpletestResultsForm extends FormBase {
   protected $database;
 
   /**
+   * The container.
+   *
+   * We need this so we can perform a non-standard redirect in submitForm().
+   *
+   * @var \Symfony\Component\DependencyInjection\ContainerInterface
+   */
+  protected $container;
+
+  /**
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container) {
     return new static(
-      $container->get('database')
+      $container->get('database'),
+      $container
     );
   }
 
@@ -57,8 +67,9 @@ public static function create(ContainerInterface $container) {
    * @param \Drupal\Core\Database\Connection $database
    *   The database connection service.
    */
-  public function __construct(Connection $database) {
+  public function __construct(Connection $database, ContainerInterface $container) {
     $this->database = $database;
+    $this->container = $container;
   }
 
   /**
@@ -94,10 +105,10 @@ protected static function buildStatusImageMap() {
       '#alt' => 'Debug',
     );
     return array(
-      'pass' => drupal_render($image_pass),
-      'fail' => drupal_render($image_fail),
-      'exception' => drupal_render($image_exception),
-      'debug' => drupal_render($image_debug),
+      'pass' => \Drupal::service('renderer')->render($image_pass),
+      'fail' => \Drupal::service('renderer')->render($image_fail),
+      'exception' => \Drupal::service('renderer')->render($image_exception),
+      'debug' => \Drupal::service('renderer')->render($image_debug),
     );
   }
 
@@ -205,7 +216,7 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
     // Under normal circumstances, a form object's submitForm() should never be
     // called directly, FormBuilder::submitForm() should be called instead.
     // However, it calls $form_state->setProgrammed(), which disables the Batch API.
-    $simpletest_test_form = new SimpletestTestForm();
+    $simpletest_test_form = SimpletestTestForm::create($this->container);
     $simpletest_test_form->buildForm($form_execute, $form_state_execute);
     $simpletest_test_form->submitForm($form_execute, $form_state_execute);
     if ($redirect = $form_state_execute->getRedirect()) {
diff --git a/core/modules/simpletest/src/Form/SimpletestTestForm.php b/core/modules/simpletest/src/Form/SimpletestTestForm.php
index 92c8a54..82dbe30 100644
--- a/core/modules/simpletest/src/Form/SimpletestTestForm.php
+++ b/core/modules/simpletest/src/Form/SimpletestTestForm.php
@@ -11,6 +11,8 @@
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Core\Form\FormBase;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Render\Renderer;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * List tests arranged in groups that can be selected and run.
@@ -18,6 +20,30 @@
 class SimpletestTestForm extends FormBase {
 
   /**
+   * Rendering service.
+   *
+   * @var Drupal\Core\Render\Renderer
+   */
+  protected $renderer;
+
+  /**
+   * Constructor where we inject the renderer service.
+   *
+   * @param \Drupal\Core\Render\Renderer $renderer
+   *   The renderer service.
+   */
+  public function __construct(Renderer $renderer) {
+    $this->renderer = $renderer;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static($container->get('renderer'));
+  }
+
+  /**
    * {@inheritdoc}
    */
   public function getFormId() {
@@ -99,8 +125,8 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#suffix' => '<a href="#" class="simpletest-collapse">(' . $this->t('Collapse') . ')</a>',
     );
     $form['tests']['#attached']['drupalSettings']['simpleTest']['images'] = [
-      drupal_render($image_collapsed),
-      drupal_render($image_extended),
+      $this->renderer->render($image_collapsed),
+      $this->renderer->render($image_extended),
     ];
 
     // Generate the list of tests arranged by group.
diff --git a/core/modules/simpletest/src/KernelTestBase.php b/core/modules/simpletest/src/KernelTestBase.php
index bd611f4..5ae06ed 100644
--- a/core/modules/simpletest/src/KernelTestBase.php
+++ b/core/modules/simpletest/src/KernelTestBase.php
@@ -561,7 +561,7 @@ protected function registerStreamWrapper($scheme, $class, $type = StreamWrapperI
   }
 
   /**
-   * Renders a render array.
+   * Renders a render array using the mocked Drupal's configuration.
    *
    * @param array $elements
    *   The elements to render.
diff --git a/core/modules/simpletest/src/Tests/KernelTestBaseTest.php b/core/modules/simpletest/src/Tests/KernelTestBaseTest.php
index 6d92255..6d89965 100644
--- a/core/modules/simpletest/src/Tests/KernelTestBaseTest.php
+++ b/core/modules/simpletest/src/Tests/KernelTestBaseTest.php
@@ -295,11 +295,11 @@ function testEnableModulesTheme() {
     );
     $this->enableModules(array('system'));
     // _theme() throws an exception if modules are not loaded yet.
-    $this->assertTrue(drupal_render($element));
+    $this->assertTrue($this->render($element));
 
     $element = $original_element;
     $this->disableModules(array('entity_test'));
-    $this->assertTrue(drupal_render($element));
+    $this->assertTrue($this->render($element));
   }
 
   /**
diff --git a/core/modules/simpletest/src/WebTestBase.php b/core/modules/simpletest/src/WebTestBase.php
index 8e29d46..9ab8039 100644
--- a/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -303,11 +303,11 @@ protected function drupalCreateContentType(array $values = array()) {
    *
    * 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.
+   * renderable array for an entity is constructed in
+   * \Drupal::service('renderer')->render(). Some tests require the complete
+   * renderable array for an entity outside of the rendering 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.
@@ -320,7 +320,7 @@ protected function drupalCreateContentType(array $values = array()) {
    *   (optional) Whether to clear the cache for this entity.
    * @return array
    *
-   * @see drupal_render()
+   * @see \Drupal::service('renderer')->render()
    */
   protected function drupalBuildEntityView(EntityInterface $entity, $view_mode = 'full', $langcode = NULL, $reset = FALSE) {
     $ensure_fully_built = function(&$elements) use (&$ensure_fully_built) {