add doctrine/persistence as a dev requirement

src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerTraitTest.php

@@ -518,7 +518,7 @@ abstract class ControllerTraitTest extends TestCase
 
     public function testGetDoctrine()
     {
-        $doctrine = $this->getMockBuilder(ManagerRegistry::class)->getMock();
+        $doctrine = $this->createMock(ManagerRegistry::class);
 
         $container = new Container();
         $container->set('doctrine', $doctrine);

src/Symfony/Bundle/FrameworkBundle/composer.json

@@ -32,6 +32,7 @@
     "require-dev": {
         "doctrine/annotations": "^1.10.4",
         "doctrine/cache": "~1.0",
+        "doctrine/persistence": "^1.3",
         "paragonie/sodium_compat": "^1.8",
         "symfony/asset": "^3.4|^4.0|^5.0",
         "symfony/browser-kit": "^4.3|^5.0",