Marking new service has private, then adding a workaround for the integration test

Resources/config/parser.xml

@@ -21,6 +21,6 @@
         </service>
 
         <!-- parsers will be injected with a compiler pass -->
-        <service id="markdown.parser.parser_manager" class="Knp\Bundle\MarkdownBundle\Parser\ParserManager" />
+        <service id="markdown.parser.parser_manager" class="Knp\Bundle\MarkdownBundle\Parser\ParserManager" public="false" />
     </services>
 </container>

Tests/Parser/ParserManagerTest.php

@@ -15,8 +15,9 @@ class ParserManagerTest extends \PHPUnit_Framework_TestCase
         $kernel->boot();
         $container = $kernel->getContainer();
 
+        $serviceHelper = $container->get('knp.markdown.test.service_helper');
         /** @var ParserManager $parserManager */
-        $parserManager = $container->get('markdown.parser.parser_manager');
+        $parserManager = $serviceHelper->getParserManager();
 
         $actual = $parserManager->transform('*hi*');
         $this->assertEquals("<p><em>hi</em></p>\n", $actual, 'There is a default parser');

Tests/fixtures/app/ServiceHelper.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Knp\Bundle\MarkdownBundle\Tests\fixtures\app;
+
+use Knp\Bundle\MarkdownBundle\Parser\ParserManager;
+
+/**
+ * Class helps access private services from integration tests.
+ */
+class ServiceHelper
+{
+    private $parserManager;
+
+    public function __construct(ParserManager $parserManager)
+    {
+        $this->parserManager = $parserManager;
+    }
+
+    public function getParserManager()
+    {
+        return $this->parserManager;
+    }
+}

Tests/fixtures/app/TestKernel.php

@@ -6,7 +6,7 @@ use Knp\Bundle\MarkdownBundle\KnpMarkdownBundle;
 use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
 use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\HttpKernel\Bundle\BundleInterface;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\HttpKernel\Kernel;
 
 class TestKernel extends Kernel
@@ -25,6 +25,10 @@ class TestKernel extends Kernel
             $c->loadFromExtension('framework', array(
                 'secret' => 'MarkdownTesting'
             ));
+
+            // add a service to help access private services for integration tests
+            $c->register('knp.markdown.test.service_helper', 'Knp\Bundle\MarkdownBundle\Tests\fixtures\app\ServiceHelper')
+                ->addArgument(new Reference('markdown.parser.parser_manager'));
         });
     }
 }

Twig/Extension/MarkdownTwigExtension.php

@@ -6,7 +6,7 @@ use Knp\Bundle\MarkdownBundle\Parser\ParserManager;
 
 class MarkdownTwigExtension extends \Twig_Extension
 {
-    protected $parserManager;
+    private $parserManager;
 
     public function __construct(ParserManager $parserManager)
     {