Update to Drupal 8.1.0. For more information, see https://www.drupal.org/drupal-8.1.0-release-notes

core/modules/help/tests/modules/help_page_test/help_page_test.info.yml

@@ -0,0 +1,7 @@
+name: 'Help Page Test'
+type: module
+description: 'Module to test the help page.'
+package: Testing
+version: VERSION
+core: 8.x
+hidden: true

core/modules/help/tests/modules/help_page_test/help_page_test.module

@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * @file
+ * Help Page Test module to test the help page.
+ */
+
+use \Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Implements hook_help().
+ */
+function help_page_test_help($route_name, RouteMatchInterface $route_match) {
+
+  switch ($route_name) {
+    case 'help.page.help_page_test':
+      // Make the help text conform to core standards. See
+      // \Drupal\system\Tests\Module\InstallUninstallTest::assertHelp().
+      return t('Read the <a href=":url">online documentation for the Help Page Test module</a>.', [':url' => 'http://www.example.com']);
+    case 'help_page_test.has_help':
+      return t('I have help!');
+  }
+
+  // Ensure that hook_help() can return an empty string and not cause the block
+  // to display.
+  return '';
+}

core/modules/help/tests/modules/help_page_test/help_page_test.routing.yml

@@ -0,0 +1,13 @@
+help_page_test.has_help:
+  path: '/help_page_test/has_help'
+  defaults:
+    _controller: '\Drupal\help_page_test\HelpPageTestController::hasHelp'
+  requirements:
+    _access: 'TRUE'
+
+help_page_test.no_help:
+  path: '/help_page_test/no_help'
+  defaults:
+    _controller: '\Drupal\help_page_test\HelpPageTestController::noHelp'
+  requirements:
+    _access: 'TRUE'

core/modules/help/tests/modules/help_page_test/src/HelpPageTestController.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Drupal\help_page_test;
+
+/**
+ * Provides controllers for testing the help block.
+ */
+class HelpPageTestController {
+
+  /**
+   * Provides a route with help.
+   *
+   * @return array
+   *   A render array.
+   */
+  public function hasHelp() {
+    return ['#markup' => 'A route with help.'];
+  }
+
+  /**
+   * Provides a route with no help.
+   *
+   * @return array
+   *   A render array.
+   */
+  public function noHelp() {
+    return ['#markup' => 'A route without help.'];
+  }
+
+}

core/modules/help/tests/modules/help_page_test/src/Plugin/HelpSection/EmptyHelpSection.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\help_page_test\Plugin\HelpSection;
+
+use Drupal\help\Plugin\HelpSection\HelpSectionPluginBase;
+
+/**
+ * Provides an empty section for the help page, for testing.
+ *
+ * @HelpSection(
+ *   id = "empty_section",
+ *   title = @Translation("Empty section"),
+ *   description = @Translation("This description should appear."),
+ * )
+ */
+class EmptyHelpSection extends HelpSectionPluginBase {
+  /**
+   * {@inheritdoc}
+   */
+  public function listTopics() {
+    return [];
+  }
+
+}

core/modules/help/tests/modules/help_test/src/SupernovaGenerator.php

@@ -1,10 +1,5 @@
 <?php
 
-/**
- * @file
- * Contains \Drupal\help_test\SupernovaGenerator.
- */
-
 namespace Drupal\help_test;
 
 use Drupal\Core\Routing\UrlGeneratorInterface;

core/modules/help/tests/src/Kernel/HelpEmptyPageTest.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Drupal\Tests\help\Kernel;
+
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\Routing\RouteMatch;
+use Drupal\help_test\SupernovaGenerator;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the empty HTML page.
+ *
+ * @group help
+ */
+class HelpEmptyPageTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['system', 'help_test', 'user'];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function register(ContainerBuilder $container) {
+    parent::register($container);
+
+    $container->set('url_generator', new SupernovaGenerator());
+  }
+
+  /**
+   * Ensures that no URL generator is called on a page without hook_help().
+   */
+  public function testEmptyHookHelp() {
+    $all_modules = system_rebuild_module_data();
+    $all_modules = array_filter($all_modules, function ($module) {
+      // Filter contrib, hidden, already enabled modules and modules in the
+      // Testing package.
+      if ($module->origin !== 'core' || !empty($module->info['hidden']) || $module->status == TRUE || $module->info['package'] == 'Testing') {
+        return FALSE;
+      }
+      return TRUE;
+    });
+
+    $this->enableModules(array_keys($all_modules));
+    $this->installEntitySchema('menu_link_content');
+
+    $route = \Drupal::service('router.route_provider')->getRouteByName('<front>');
+    \Drupal::service('module_handler')->invokeAll('help', ['<front>', new RouteMatch('<front>', $route)]);
+  }
+
+}