Add test for container compilation

To help catch changes in symfony container such as the ones in 3.3

src/DMS/Bundle/FilterBundle/Tests/Integration/ContainerTest.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace DMS\DMS\Bundle\FilterBundle\Tests\Integration;
+
+use DMS\Bundle\FilterBundle\DependencyInjection\DMSFilterExtension;
+use Doctrine\Common\Annotations\AnnotationReader;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+class ContainerTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var ContainerBuilder
+     */
+    private $container;
+
+    /**
+     * @before
+     * @return void
+     */
+    public function buildContainer()
+    {
+        $this->container = new ContainerBuilder();
+
+        // Cover external dependencies
+        $this->container->set('annotation_reader', $this->prophesize(AnnotationReader::class)->reveal());
+
+        $extension = new DMSFilterExtension();
+        $extension->load([], $this->container);
+
+        $this->container->compile();
+    }
+
+    public function testContainerBoots()
+    {
+        $this->container->get('dms.filter');
+
+        if (method_exists($this->container, 'isCompiled')) {
+            self::assertTrue($this->container->isCompiled());
+        } else {
+            self::assertTrue($this->container->isFrozen());
+        }
+
+    }
+}