diff --git a/core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserTest.php b/core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserTest.php
index 0cb1ccd..2e0965d 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserTest.php
@@ -88,8 +88,20 @@ protected function assertEntity($id, $label, $mail, $password, $access, $login,
   public function testUser() {
     $password = '$S$DGFZUE.FhrXbe4y52eC7p0ZVRGD/gOPtVctDlmC89qkujnBokAlJ';
     $this->assertEntity(2, 'Odo', 'odo@local.host', $password, '0', '0', FALSE, '', 'odo@local.host');
+
     // Ensure that the user can authenticate.
     $this->assertEquals(2, \Drupal::service('user.auth')->authenticate('Odo', 'a password'));
+    // After authenticating the password will be rehashed because the password
+    // stretching iteration count has changed from 15 in Drupal 7 to 16 in
+    // Drupal 8.
+    $user = User::load(2);
+    $rehash = $user->getPassword();
+    $this->assertNotEquals($password, $rehash);
+
+    // Authenticate again and there should be no re-hash.
+    $this->assertEquals(2, \Drupal::service('user.auth')->authenticate('Odo', 'a password'));
+    $user = User::load(2);
+    $this->assertEquals($rehash, $user->getPassword());
   }
 
 }