diff --git a/core/tests/Drupal/Tests/Component/Serialization/YamlTest.php b/core/tests/Drupal/Tests/Component/Serialization/YamlTest.php
index 3c0248b..b21e429 100644
--- a/core/tests/Drupal/Tests/Component/Serialization/YamlTest.php
+++ b/core/tests/Drupal/Tests/Component/Serialization/YamlTest.php
@@ -71,7 +71,7 @@ public function testYamlFiles($file) {
    */
   public function providerYamlFilesInCore() {
     $files = [];
-    $dirs = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator(__DIR__ . '/../../../../../', \RecursiveDirectoryIterator::FOLLOW_SYMLINKS));
+    $dirs = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator(__DIR__ . '/../../../../../../', \RecursiveDirectoryIterator::FOLLOW_SYMLINKS));
     foreach ($dirs as $dir) {
       $pathname = $dir->getPathname();
       // Exclude vendor.
@@ -81,7 +81,7 @@ public function providerYamlFilesInCore() {
           // library API behaviours, ignore them.
           continue;
         }
-        $files[] = array($dir->getRealPath());
+        $files[] = [$dir->getRealPath()];
       }
     }
     return $files;