diff -u b/core/modules/layout_builder/tests/src/FunctionalJavascript/FieldValuesTest.php b/core/modules/layout_builder/tests/src/FunctionalJavascript/FieldValuesTest.php
--- b/core/modules/layout_builder/tests/src/FunctionalJavascript/FieldValuesTest.php
+++ b/core/modules/layout_builder/tests/src/FunctionalJavascript/FieldValuesTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\layout_builder\FunctionalJavascript;
 
+use Behat\Mink\Element\NodeElement;
 use Drupal\FunctionalJavascriptTests\WebDriverTestBase;
 
 /**
@@ -32,7 +33,7 @@
   /**
    * {@inheritdoc}
    */
-  protected function setUp() {
+  protected function setUp(): void {
     parent::setUp();
 
     $this->createContentType(['type' => 'bundle_for_testing_fields']);