Update to Drupal 8.1.8. For more information, see https://www.drupal.org/project/drupal/releases/8.1.8

core/modules/big_pipe/tests/modules/big_pipe_regression_test/big_pipe_regression_test.info.yml

@@ -0,0 +1,6 @@
+name: 'BigPipe regression test'
+type: module
+description: 'Support module for BigPipe regression testing.'
+package: Testing
+version: VERSION
+core: 8.x

core/modules/big_pipe/tests/modules/big_pipe_regression_test/big_pipe_regression_test.routing.yml

@@ -0,0 +1,6 @@
+big_pipe_regression_test.2678662:
+  path: '/big_pipe_regression_test/2678662'
+  defaults:
+    _controller: '\Drupal\big_pipe_regression_test\BigPipeRegressionTestController::regression2678662'
+  requirements:
+    _access: 'TRUE'

core/modules/big_pipe/tests/modules/big_pipe_regression_test/src/BigPipeRegressionTestController.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Drupal\big_pipe_regression_test;
+
+use Drupal\big_pipe\Render\BigPipeMarkup;
+
+class BigPipeRegressionTestController {
+
+  const MARKER_2678662 = '<script>var hitsTheFloor = "</body>";</script>';
+
+  /**
+   * @see \Drupal\Tests\big_pipe\FunctionalJavascript\BigPipeRegressionTest::testMultipleBodies_2678662()
+   */
+  public function regression2678662() {
+    return [
+      '#markup' => BigPipeMarkup::create(self::MARKER_2678662),
+    ];
+  }
+
+}

core/modules/big_pipe/tests/src/FunctionalJavascript/BigPipeRegressionTest.php

@@ -2,10 +2,13 @@
 
 namespace Drupal\Tests\big_pipe\FunctionalJavascript;
 
+use Drupal\big_pipe\Render\BigPipe;
+use Drupal\big_pipe_regression_test\BigPipeRegressionTestController;
 use Drupal\comment\CommentInterface;
 use Drupal\comment\Entity\Comment;
 use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
 use Drupal\comment\Tests\CommentTestTrait;
+use Drupal\Core\Url;
 use Drupal\editor\Entity\Editor;
 use Drupal\filter\Entity\FilterFormat;
 use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
@@ -27,13 +30,8 @@ class BigPipeRegressionTest extends JavascriptTestBase {
    * {@inheritdoc}
    */
   public static $modules = [
-    'node',
-    'comment',
     'big_pipe',
-    'history',
-    'editor',
-    'ckeditor',
-    'filter',
+    'big_pipe_regression_test',
   ];
 
   /**
@@ -53,6 +51,8 @@ class BigPipeRegressionTest extends JavascriptTestBase {
    * @see https://www.drupal.org/node/2698811
    */
   public function testCommentForm_2698811() {
+    $this->assertTrue($this->container->get('module_installer')->install(['comment', 'history', 'ckeditor'], TRUE), 'Installed modules.');
+
     // Ensure an `article` node type exists.
     $this->createContentType(['type' => 'article']);
     $this->addDefaultCommentField('node', 'article');
@@ -114,4 +114,74 @@ JS;
     $this->assertJsCondition($javascript);
   }
 
+  /**
+   * Ensure BigPipe works despite inline JS containing the string "</body>".
+   *
+   * @see https://www.drupal.org/node/2678662
+   */
+  public function testMultipleClosingBodies_2678662() {
+    $this->assertTrue($this->container->get('module_installer')->install(['render_placeholder_message_test'], TRUE), 'Installed modules.');
+
+    $this->drupalLogin($this->drupalCreateUser());
+    $this->drupalGet(Url::fromRoute('big_pipe_regression_test.2678662'));
+
+    // Confirm that AJAX behaviors were instantiated, if not, this points to a
+    // JavaScript syntax error.
+    $javascript = <<<JS
+    (function(){
+      return Object.keys(Drupal.ajax.instances).length > 0;
+    }());
+JS;
+    $this->assertJsCondition($javascript);
+
+    // Besides verifying there is no JavaScript syntax error, also verify the
+    // HTML structure.
+    $this->assertSession()
+      ->responseContains(BigPipe::STOP_SIGNAL . "\n\n\n</body></html>", 'The BigPipe stop signal is present just before the closing </body> and </html> tags.');
+    $js_code_until_closing_body_tag = substr(BigPipeRegressionTestController::MARKER_2678662, 0, strpos(BigPipeRegressionTestController::MARKER_2678662, '</body>'));
+    $this->assertSession()
+      ->responseNotContains($js_code_until_closing_body_tag . "\n" . BigPipe::START_SIGNAL, 'The BigPipe start signal does NOT start at the closing </body> tag string in an inline script.');
+  }
+
+  /**
+   * Ensure messages set in placeholders always appear.
+   *
+   * @see https://www.drupal.org/node/2712935
+   */
+  public function testMessages_2712935() {
+    $this->assertTrue($this->container->get('module_installer')->install(['render_placeholder_message_test'], TRUE), 'Installed modules.');
+
+    $this->drupalLogin($this->drupalCreateUser());
+    $messages_markup = '<div role="contentinfo" aria-label="Status message"';
+
+    $test_routes = [
+      // Messages placeholder rendered first.
+      'render_placeholder_message_test.first',
+      // Messages placeholder rendered after one, before another.
+      'render_placeholder_message_test.middle',
+      // Messages placeholder rendered last.
+      'render_placeholder_message_test.last',
+    ];
+
+    $assert = $this->assertSession();
+    foreach ($test_routes as $route) {
+      // Verify that we start off with zero messages queued.
+      $this->drupalGet(Url::fromRoute('render_placeholder_message_test.queued'));
+      $assert->responseNotContains($messages_markup);
+
+      // Verify the test case at this route behaves as expected.
+      $this->drupalGet(Url::fromRoute($route));
+      $assert->elementContains('css', 'p.logged-message:nth-of-type(1)', 'Message: P1');
+      $assert->elementContains('css', 'p.logged-message:nth-of-type(2)', 'Message: P2');
+      $assert->responseContains($messages_markup);
+      $assert->elementExists('css', 'div[aria-label="Status message"] ul');
+      $assert->elementContains('css', 'div[aria-label="Status message"] ul li:nth-of-type(1)', 'P1');
+      $assert->elementContains('css', 'div[aria-label="Status message"] ul li:nth-of-type(2)', 'P2');
+
+      // Verify that we end with all messages printed, hence again zero queued.
+      $this->drupalGet(Url::fromRoute('render_placeholder_message_test.queued'));
+      $assert->responseNotContains($messages_markup);
+    }
+  }
+
 }