Jose Luis Bellido Rojas
--- a/modules/ajax_example/tests/src/Functional/DynamicFormSectionsTest.php
+++ b/modules/ajax_example/tests/src/Functional/DynamicFormSectionsTest.php
      $this->drupalGet($dropdown_url);
      $this->submitForm(['question_type_select' => $question_style], 'Choose');
      $detail_children = $page->findAll('css', 'div.details-wrapper *');
-      $this->assertNotEquals($this->count($detail_children), 0);
+      $this->assertNotEquals($this->count(), 0);
--- a/modules/ajax_example/tests/src/Functional/DynamicFormSectionsTest.php
+++ b/modules/ajax_example/tests/src/Functional/DynamicFormSectionsTest.php
    $this->drupalGet($dropdown_url);
    $this->submitForm(['question_type_select' => 'Multiple Choice'], 'Choose');
    $detail_children = $page->findAll('css', 'div.details-wrapper *');
-    $this->assertNotEquals($this->count($detail_children), 0);
+    $this->assertNotEquals($this->count(), 0);
--- a/modules/form_api_example/src/Form/InputDemo.php
+++ b/modules/form_api_example/src/Form/InputDemo.php
 use Drupal\Core\Form\FormBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Extension\ModuleExtensionList;
--- a/modules/form_api_example/src/Form/InputDemo.php
+++ b/modules/form_api_example/src/Form/InputDemo.php
 class InputDemo extends FormBase {

+  /**
+   * The module extension list.
+   *
+   * @var \Drupal\Core\Extension\ModuleExtensionList
+   */
+  protected $moduleExtensionList;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    // Forms that require a Drupal service or a custom service should access
+    // the service using dependency injection.
+    // @link https://www.drupal.org/node/2203931.
--- a/modules/testing_example/src/Controller/TestingExampleController.php
+++ b/modules/testing_example/src/Controller/TestingExampleController.php
 namespace Drupal\testing_example\Controller;

 use Drupal\examples\Utility\DescriptionTemplateTrait;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Extension\ModuleExtensionList;