fix tests

Author: nicolas-grekas

Tests/CacheWarmer/SerializerCacheWarmerTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\CacheWarmer;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\CacheWarmer\SerializerCacheWarmer;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\Cache\Adapter\ArrayAdapter;
@@ -22,6 +23,8 @@
 
 class SerializerCacheWarmerTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     public function testWarmUp()
     {
         if (!class_exists(CacheClassMetadataFactory::class) || !method_exists(XmlFileLoader::class, 'getMappedClasses') || !method_exists(YamlFileLoader::class, 'getMappedClasses')) {

Tests/CacheWarmer/ValidatorCacheWarmerTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\CacheWarmer;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\CacheWarmer\ValidatorCacheWarmer;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\Cache\Adapter\ArrayAdapter;
@@ -21,6 +22,8 @@
 
 class ValidatorCacheWarmerTest extends TestCase
 {
+    use ForwardCompatTestTrait;
+
     public function testWarmUp()
     {
         $validatorBuilder = new ValidatorBuilder();