use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
 use PHPUnit\Framework\TestCase;

-final class SomeClass extends TestCase
+class SomeClass extends TestCase
 {
     public function run()
     {
-        $requestStack = new RequestStack();
         $request = new Request();
-        $requestStack->push($request);
+        $requestStack = new RequestStack([$request]);
     }
 }

 use Symfony\Component\HttpFoundation;

 class SomeClass
 {
     public function run()
     {
-        $binaryFile = BinaryFileResponse::create();
+        $binaryFile = new BinaryFileResponse(null);
     }
 }