Fixing 5.1 deprecation

tests/IntegrationTest.php

@@ -22,6 +22,7 @@
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\HttpKernel\Log\Logger;
+use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;
 use Symfony\Component\Routing\RouteCollectionBuilder;
 use Symfony\WebpackEncoreBundle\Asset\EntrypointLookupCollectionInterface;
 use Symfony\WebpackEncoreBundle\Asset\EntrypointLookupInterface;
@@ -177,7 +178,7 @@ public function testAutowireDefaultBuildArgument()
     }
 }
 
-class WebpackEncoreIntegrationTestKernel extends Kernel
+abstract class AbstractWebpackEncoreIntegrationTestKernel extends Kernel
 {
     use MicroKernelTrait;
 
@@ -203,11 +204,6 @@ public function registerBundles()
         ];
     }
 
-    protected function configureRoutes(RouteCollectionBuilder $routes)
-    {
-        $routes->add('/foo', 'kernel:'.(parent::VERSION_ID >= 40100 ? ':' : '').'renderFoo');
-    }
-
     protected function configureContainer(ContainerBuilder $container, LoaderInterface $loader)
     {
         $container->loadFromExtension('framework', [
@@ -268,6 +264,22 @@ public function renderFoo()
     }
 }
 
+if (method_exists(AbstractWebpackEncoreIntegrationTestKernel::class, 'configureRouting')) {
+    class WebpackEncoreIntegrationTestKernel extends AbstractWebpackEncoreIntegrationTestKernel {
+        protected function configureRouting(RoutingConfigurator $routes): void
+        {
+            $routes->add('/foo', 'kernel:'.(parent::VERSION_ID >= 40100 ? ':' : '').'renderFoo');
+        }
+    }
+} else {
+    class WebpackEncoreIntegrationTestKernel extends AbstractWebpackEncoreIntegrationTestKernel {
+        protected function configureRoutes(RouteCollectionBuilder $routes)
+        {
+            $routes->add('/foo', 'kernel:'.(parent::VERSION_ID >= 40100 ? ':' : '').'renderFoo');
+        }
+    }
+}
+
 class WebpackEncoreCacheWarmerTester
 {
     private $entrypointCacheWarmer;