.../comment/Tests/CommentDefaultFormatterCacheTagsTest.php       | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/core/modules/comment/lib/Drupal/comment/Tests/CommentDefaultFormatterCacheTagsTest.php b/core/modules/comment/lib/Drupal/comment/Tests/CommentDefaultFormatterCacheTagsTest.php
index cdec3ec..5e66470 100644
--- a/core/modules/comment/lib/Drupal/comment/Tests/CommentDefaultFormatterCacheTagsTest.php
+++ b/core/modules/comment/lib/Drupal/comment/Tests/CommentDefaultFormatterCacheTagsTest.php
@@ -39,6 +39,10 @@ public static function getInfo() {
   public function setUp() {
     parent::setUp();
 
+    $this->drupalLogin($this->drupalCreateUser(array(
+      'access comments',
+    )));
+
     // Set up a field, so that the entity that'll be referenced bubbles up a
     // cache tag when rendering it entirely.
     entity_create('field_config', array(
@@ -95,6 +99,11 @@ public function testCacheTags() {
     ));
     $comment->save();
 
+    // Load commented entity so comment_count gets computed.
+    // @todo remove the $reset = TRUE parameter after
+    //   https://drupal.org/node/597236 lands, it's a temporary work-around.
+    $commented_entity = entity_load('entity_test', $commented_entity->id(), TRUE);
+
     // Verify cache tags on the rendered entity before it has comments.
     $build = \Drupal::entityManager()
       ->getViewBuilder('entity_test')