diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 0b66e79..2170aa9 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -52,4 +52,4 @@ jobs:
         env:
           SYMFONY_REQUIRE: "${{ matrix.symfony-versions }}"
       - name: tests
-        run: vendor/bin/phpunit
+        run: SYMFONY_DEPRECATIONS_HELPER="disabled=1" vendor/bin/simple-phpunit
diff --git a/src/DependencyInjection/Compiler/TransformerFactoryPass.php b/src/DependencyInjection/Compiler/TransformerFactoryPass.php
index fd02ce9..49c900d 100644
--- a/src/DependencyInjection/Compiler/TransformerFactoryPass.php
+++ b/src/DependencyInjection/Compiler/TransformerFactoryPass.php
@@ -4,7 +4,6 @@
 
 use AutoMapper\Generator\Generator;
 use AutoMapper\Transformer\ChainTransformerFactory;
-use AutoMapper\Transformer\CustomTransformer\CustomTransformerFactory;
 use AutoMapper\Transformer\CustomTransformer\CustomTransformerInterface;
 use AutoMapper\Transformer\CustomTransformer\CustomTransformersRegistry;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
diff --git a/tests/Resources/App/AppKernel.php b/tests/Resources/App/AppKernel.php
index 329522a..aa5c462 100644
--- a/tests/Resources/App/AppKernel.php
+++ b/tests/Resources/App/AppKernel.php
@@ -13,17 +13,12 @@
 use AutoMapper\Bundle\Tests\Fixtures\UserDTO;
 use AutoMapper\MapperGeneratorMetadataInterface;
 use AutoMapper\MapperMetadata;
-use AutoMapper\Transformer\CustomTransformer\CustomModelTransformer;
-use AutoMapper\Transformer\CustomTransformer\CustomModelTransformerInterface;
 use AutoMapper\Transformer\CustomTransformer\CustomPropertyTransformerInterface;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
 use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
 use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Kernel;
-use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;
-use Symfony\Component\Routing\Route;
 use Symfony\Component\Serializer\NameConverter\AdvancedNameConverterInterface;
 
 class AppKernel extends Kernel
@@ -40,22 +35,11 @@ public function registerBundles(): array
         return $bundles;
     }
 
-    private function configureRoutes(RoutingConfigurator $routes): void
-    {
-        $route = new Route('/', ['_controller' => 'kernel::indexAction']);
-        $routes->collection->add('index_action', $route);
-    }
-
     protected function configureContainer(ContainerBuilder $container, LoaderInterface $loader): void
     {
         $loader->load(__DIR__ . '/config.yml');
     }
 
-    public function indexAction(): Response
-    {
-        return new Response();
-    }
-
     public function getProjectDir(): string
     {
         return __DIR__ . '/..';
@@ -67,7 +51,7 @@ class YearOfBirthTransformer implements CustomPropertyTransformerInterface
     {
         public function transform(object|array $user): mixed
         {
-            assert($user instanceof User);
+            \assert($user instanceof User);
 
             return ((int) date('Y')) - ((int) $user->age);
         }
@@ -80,7 +64,6 @@ public function supports(string $source, string $target, string $propertyName):
 
     class UserMapperConfiguration
     {
-
     }
 } else {
     class UserMapperConfiguration implements MapperConfigurationInterface
diff --git a/tests/ServiceInstantiationTest.php b/tests/ServiceInstantiationTest.php
index 510b211..481d069 100644
--- a/tests/ServiceInstantiationTest.php
+++ b/tests/ServiceInstantiationTest.php
@@ -44,7 +44,7 @@ public function testWarmup(): void
         self::assertInstanceOf(\Symfony_Mapper_AutoMapper_Bundle_Tests_Fixtures_AddressDTO_array::class, new \Symfony_Mapper_AutoMapper_Bundle_Tests_Fixtures_AddressDTO_array());
     }
 
-    public function testAutoMapper()
+    public function testAutoMapper(): void
     {
         static::bootKernel();
         $container = static::$kernel->getContainer();