[Form] ensure compatibility with older PHPUnit mocks

Author: xabbuh

Tests/Controller/ControllerTraitTest.php

@@ -15,6 +15,7 @@
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\Form\Form;
+use Symfony\Component\Form\FormConfigInterface;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\File\File;
 use Symfony\Component\HttpFoundation\JsonResponse;
@@ -487,8 +488,7 @@ public function testCreateNotFoundException()
 
     public function testCreateForm()
     {
-        $config = $this->getMockBuilder('Symfony\Component\Form\FormConfigInterface')->getMock();
-        $form = new Form($config);
+        $form = new Form($this->getMockBuilder(FormConfigInterface::class)->getMock());
 
         $formFactory = $this->getMockBuilder('Symfony\Component\Form\FormFactoryInterface')->getMock();
         $formFactory->expects($this->once())->method('create')->willReturn($form);