diff --git a/core/lib/Drupal/Core/Cache/DatabaseBackend.php b/core/lib/Drupal/Core/Cache/DatabaseBackend.php
index 1c32e3d203..ae27e77fbe 100644
--- a/core/lib/Drupal/Core/Cache/DatabaseBackend.php
+++ b/core/lib/Drupal/Core/Cache/DatabaseBackend.php
@@ -92,7 +92,7 @@ public function __construct(Connection $connection, CacheTagsChecksumInterface $
     $this->checksumProvider = $checksum_provider;
     $this->maxRows = $max_rows === NULL ? static::DEFAULT_MAX_ROWS : $max_rows;
     if (!$serializer) {
-      @trigger_error('Calling DatabaseBackend::__construct() without the $serializer argument is deprecated in drupal:8.8.0. The $serializer argument will be required in drupal:9.0.0. See https://www.drupal.org/node/3014688', E_USER_DEPRECATED);
+      @trigger_error('Calling DatabaseBackend::__construct() without the $serializer argument is deprecated in drupal:8.8.0 and the $serializer argument will be required in drupal:9.0.0. See https://www.drupal.org/node/3014688', E_USER_DEPRECATED);
       $serializer = \Drupal::service('serialization.phpserialize');
     }
     $this->serializer = $serializer;
diff --git a/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php b/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php
index 393ceab562..a9c183a8ac 100644
--- a/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php
@@ -93,10 +93,11 @@ public function testGarbageCollection() {
    * Tests the deprecation error triggering when the serializer param is missed.
    *
    * @group legacy
-   * @expectedDeprecation The serializer service will be a mandatory parameter in Drupal 9.0.x. See https://www.drupal.org/node/3014688.
+   * @expectedDeprecation Calling DatabaseBackend::__construct() without the $serializer argument is deprecated in drupal:8.8.0 and the $serializer argument will be required in drupal:9.0.0. See https://www.drupal.org/node/3014688
    */
   public function testDeprecationErrorTriggering() {
-    new DatabaseBackend($this->container->get('database'), $this->container->get('cache_tags.invalidator.checksum'), 'default', static::$maxRows);
+    $this->assertNotEmpty((new DatabaseBackend($this->container->get('database'), $this->container->get('cache_tags.invalidator.checksum'), 'default', static::$maxRows))
+      ->schemaDefinition());
   }
 
   /**