only in patch2:
unchanged:
--- a/core/modules/user/src/Tests/UserPasswordResetTest.php
+++ b/core/modules/user/src/Tests/UserPasswordResetTest.php
@@ -7,7 +7,8 @@
 
 namespace Drupal\user\Tests;
 
-use Drupal\simpletest\WebTestBase;
+use Drupal\Core\Url;
+use Drupal\system\Tests\Cache\PageCacheTagsTestBase;
 use Drupal\user\Entity\User;
 
 /**
@@ -15,7 +16,7 @@
  *
  * @group user
  */
-class UserPasswordResetTest extends WebTestBase {
+class UserPasswordResetTest extends PageCacheTagsTestBase {
 
   /**
    * The profile to install as a basis for testing.
@@ -69,6 +70,19 @@ protected function setUp() {
   }
 
   /**
+   * Tests the reset password page caching.
+   */
+  function testUserPasswordResetCaching() {
+    $url = Url::fromRoute('user.pass');
+
+    // Prime the page cache.
+    $this->verifyPageCache($url, 'MISS');
+
+    // Verify the page is not cached..
+    $this->verifyPageCache($url, 'MISS');
+  }
+
+  /**
    * Tests password reset functionality.
    */
   function testUserPasswordReset() {