diff -u b/core/tests/Drupal/KernelTests/Core/Form/FormCacheTest.php b/core/tests/Drupal/KernelTests/Core/Form/FormCacheTest.php
--- b/core/tests/Drupal/KernelTests/Core/Form/FormCacheTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Form/FormCacheTest.php
@@ -107,7 +107,7 @@
    */
   public function testCacheCustomExpiration() {
     // Override form cache expiration so that the cached form expired yesterday.
-    new Settings(['form_cache_expiration' => -1 * (24*60*60), 'hash_salt' => $this->randomMachineName()]);
+    new Settings(['form_cache_expiration' => -1 * (24 * 60 * 60), 'hash_salt' => $this->randomMachineName()]);
     \Drupal::formBuilder()->setCache($this->formBuildId, $this->form, $this->formState);
 
     $cached_form_state = new FormState();