Allow to configure the application kernel's debug setting

features/configuration/configuring_application_kernel.feature

@@ -75,3 +75,21 @@ Feature: Configuring application kernel
         """
         When I run Behat
         Then it should pass
+
+    Scenario: Using configured debug setting
+        Given a Behat configuration containing:
+        """
+        default:
+            extensions:
+                FriendsOfBehat\SymfonyExtension:
+                    kernel:
+                        debug: false
+        """
+        And a feature file containing:
+        """
+        Feature:
+            Scenario:
+                And the application kernel should have debug disabled
+        """
+        When I run Behat
+        Then it should pass

src/ServiceContainer/SymfonyExtension.php

@@ -58,6 +58,7 @@ final class SymfonyExtension implements Extension
                         ->scalarNode('path')->defaultNull()->end()
                         ->scalarNode('class')->defaultNull()->end()
                         ->scalarNode('environment')->defaultValue('test')->end()
+                        ->booleanNode('debug')->defaultTrue()->end()
                     ->end()
                 ->end()
             ->end()
@@ -100,7 +101,7 @@ final class SymfonyExtension implements Extension
     {
         $definition = new Definition($config['class'], [
             $config['environment'],
-            true,
+            $config['debug'],
         ]);
         $definition->addMethodCall('boot');
         $definition->setPublic(true);