only in patch2:
unchanged:
--- a/core/modules/system/lib/Drupal/system/Tests/Bootstrap/PageCacheTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Bootstrap/PageCacheTest.php
@@ -55,7 +55,7 @@ function testPageCacheTags() {
     $config->save();
 
     $path = 'system-test/cache_tags_page';
-    $tags = array('system_test_cache_tags_page' => TRUE);
+    $tags = array('system_test_cache_tags_page');
     $this->drupalGet($path);
     $this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
     $this->drupalGet($path);