diff --git a/core/modules/user/src/Tests/UserRegistrationTest.php b/core/modules/user/src/Tests/UserRegistrationTest.php
index 01418b7..2d59827 100644
--- a/core/modules/user/src/Tests/UserRegistrationTest.php
+++ b/core/modules/user/src/Tests/UserRegistrationTest.php
@@ -194,19 +194,18 @@ function testRegistrationDefaultValues() {
   }
 
   /**
-   * Ensures that you cannot register with the same name / mail twice.
+   * Tests registration errors when trying to register with an existing user
+   * name or an existing email address.
    *
    * @see \Drupal\user\Plugin\Validation\Constraint\UserNameUnique
    * @see \Drupal\user\Plugin\Validation\Constraint\UserMailUnique
    */
   public function testUniqueFields() {
-    $account = $this->drupalCreateUser([]);
+    $account = $this->drupalCreateUser();
 
-    // Existing username.
     $this->drupalPostForm('user/register', ['mail' => 'test@example.com', 'name' => $account->getUsername()], t('Create new account'));
     $this->assertRaw(Safemarkup::format('The username %value is already taken.', ['%value' => $account->getUsername()]));
 
-    // Existing mail address.
     $this->drupalPostForm('user/register', ['mail' => $account->getEmail(), 'name' => $this->randomString()], t('Create new account'));
     $this->assertRaw(Safemarkup::format('The email address %value is already taken.', ['%value' => $account->getEmail()]));
   }