From 31829a27e328507732e52ff8fba0905c8161f94d Mon Sep 17 00:00:00 2001
From: karser <dpoddubny@gmail.com>
Date: Wed, 19 Dec 2018 17:03:31 +0200
Subject: [PATCH] Fix root node deprecation in symfony/config > 4.1

---
 src/DependencyInjection/Configuration.php | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 3630e7ba..6e0671f5 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -26,8 +26,15 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder(): TreeBuilder
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('liip_functional_test', 'array');
+        if (method_exists(TreeBuilder::class, 'getRootNode')) {
+            $treeBuilder = new TreeBuilder('liip_functional_test');
+            $rootNode = $treeBuilder->getRootNode();
+        } else {
+            // BC layer for symfony/config 4.1 and older
+            $treeBuilder = new TreeBuilder();
+            $rootNode = $treeBuilder->root('liip_functional_test', 'array');
+        }
+
         $rootNode
             ->children()
                 ->arrayNode('cache_db')