Add types to private/final/internal methods and constructors.

Author: derrabus

Test/TestContainer.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Test;
 
+use Psr\Container\ContainerInterface;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
 use Symfony\Component\HttpKernel\KernelInterface;
@@ -137,7 +138,7 @@ public function getRemovedIds(): array
         return $this->getPublicContainer()->getRemovedIds();
     }
 
-    private function getPublicContainer()
+    private function getPublicContainer(): Container
     {
         if (null === $container = $this->kernel->getContainer()) {
             throw new \LogicException('Cannot access the container on a non-booted kernel. Did you forget to boot it?');
@@ -146,7 +147,7 @@ private function getPublicContainer()
         return $container;
     }
 
-    private function getPrivateContainer()
+    private function getPrivateContainer(): ContainerInterface
     {
         return $this->getPublicContainer()->get($this->privateServicesLocatorId);
     }