Remove kernel and use test kernel from core-bundle

composer.json

@@ -13,15 +13,16 @@
         "php": "^7.2",
         "friendsofsymfony/http-cache-bundle": "^2.6",
         "phpstan/phpstan": "^0.12",
-        "phpstan/phpstan-symfony": "^0.12",
         "phpstan/phpstan-phpunit": "^0.12",
+        "phpstan/phpstan-symfony": "^0.12",
         "symfony/debug": "^4.4",
         "symfony/monolog-bridge": "^4.4",
         "symfony/monolog-bundle": "^3.3",
         "symfony/templating": "^4.4"
     },
     "require-dev": {
         "contao/core-bundle": "^4.9",
+        "contao/news-bundle": "^4.9",
         "contao/test-case": "^3.0",
         "friendsofphp/php-cs-fixer": "^2.14",
         "lexik/maintenance-bundle": "^2.1.3",
@@ -31,6 +32,12 @@
         "symfony/http-client": "^4.4",
         "symfony/var-dumper": "^4.4"
     },
+    "config": {
+        "preferred-install": {
+            "contao/*": "source",
+            "*": "dist"
+        }
+    },
     "extra": {
         "phpstan": {
             "includes": [
@@ -43,7 +50,8 @@
     },
     "autoload": {
         "psr-4": {
-            "Contao\\PhpStan\\": "src/"
+            "Contao\\PhpStan\\": "src/",
+            "Contao\\CoreBundle\\Tests\\": "../../contao/core-bundle/tests/"
         }
     },
     "autoload-dev": {

src/ServiceHelper.php

@@ -12,6 +12,7 @@
 
 namespace Contao\PhpStan;
 
+use Contao\CoreBundle\Tests\Functional\app\AppKernel;
 use PhpParser\Node\Expr;
 use PHPStan\Analyser\Scope;
 use PHPStan\Type\TypeUtils;