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diff --git a/web/core/modules/comment/tests/src/Unit/Entity/CommentLockTest.php b/web/core/modules/comment/tests/src/Unit/Entity/CommentLockTest.php
new file mode 100644
index 000000000..e724dc6b8
--- /dev/null
+++ b/web/core/modules/comment/tests/src/Unit/Entity/CommentLockTest.php
@@ -0,0 +1,96 @@
+<?php
+
+namespace Drupal\Tests\comment\Unit\Entity;
+
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Tests\UnitTestCase;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
+
+/**
+ * Tests comment acquires and releases the right lock.
+ *
+ * @group comment
+ */
+class CommentLockTest extends UnitTestCase {
+
+  /**
+   * Test the lock behavior.
+   */
+  public function testLocks() {
+    $container = new ContainerBuilder();
+    $container->set('module_handler', $this->getMock('Drupal\Core\Extension\ModuleHandlerInterface'));
+    $container->set('current_user', $this->getMock('Drupal\Core\Session\AccountInterface'));
+    $container->set('cache.test', $this->getMock('Drupal\Core\Cache\CacheBackendInterface'));
+    $container->set('comment.statistics', $this->getMock('Drupal\comment\CommentStatisticsInterface'));
+    $request_stack = new RequestStack();
+    $request_stack->push(Request::create('/'));
+    $container->set('request_stack', $request_stack);
+    $container->setParameter('cache_bins', ['cache.test' => 'test']);
+    $lock = $this->getMock('Drupal\Core\Lock\LockBackendInterface');
+    $cid = 2;
+    $lock_name = "comment:$cid:.00/";
+    $lock->expects($this->at(0))
+      ->method('acquire')
+      ->with($lock_name, 30)
+      ->will($this->returnValue(TRUE));
+    $lock->expects($this->at(1))
+      ->method('release')
+      ->with($lock_name);
+    $lock->expects($this->exactly(2))
+      ->method($this->anything());
+    $container->set('lock', $lock);
+
+    $cache_tag_invalidator = $this->getMock('Drupal\Core\Cache\CacheTagsInvalidator');
+    $container->set('cache_tags.invalidator', $cache_tag_invalidator);
+
+    \Drupal::setContainer($container);
+    $methods = get_class_methods('Drupal\comment\Entity\Comment');
+    unset($methods[array_search('preSave', $methods)]);
+    unset($methods[array_search('postSave', $methods)]);
+    $methods[] = 'invalidateTagsOnSave';
+    $comment = $this->getMockBuilder('Drupal\comment\Entity\Comment')
+      ->disableOriginalConstructor()
+      ->setMethods($methods)
+      ->getMock();
+    $comment->expects($this->once())
+      ->method('isNew')
+      ->will($this->returnValue(TRUE));
+    $comment->expects($this->once())
+      ->method('hasParentComment')
+      ->will($this->returnValue(TRUE));
+    $comment->expects($this->once())
+      ->method('getParentComment')
+      ->will($this->returnValue($comment));
+    $comment->expects($this->once())
+      ->method('getCommentedEntityId')
+      ->will($this->returnValue($cid));
+    $comment->expects($this->any())
+      ->method('getThread')
+      ->will($this->returnValue(''));
+
+    $parent_entity = $this->getMock('\Drupal\Core\Entity\ContentEntityInterface');
+    $parent_entity->expects($this->atLeastOnce())
+      ->method('getCacheTagsToInvalidate')
+      ->willReturn(['node:1']);
+    $comment->expects($this->once())
+      ->method('getCommentedEntity')
+      ->willReturn($parent_entity);
+
+    $entity_type = $this->getMock('\Drupal\Core\Entity\EntityTypeInterface');
+    $comment->expects($this->any())
+      ->method('getEntityType')
+      ->will($this->returnValue($entity_type));
+    $comment->expects($this->at(1))
+      ->method('get')
+      ->with('status')
+      ->will($this->returnValue((object) ['value' => NULL]));
+    $storage = $this->getMock('Drupal\comment\CommentStorageInterface');
+
+    // preSave() should acquire the lock. (This is what's really being tested.)
+    $comment->preSave($storage);
+    // Release the acquired lock before exiting the test.
+    $comment->postSave($storage);
+  }
+
+}