Symfony4 support

features/not_crashing_behat.feature

@@ -56,3 +56,35 @@ Feature: Not crashing Behat
         And a feature file with passing scenario
         When I run Behat
         Then it should pass
+
+    Scenario: This extension boot a Symfony4 kernel
+        Given a Behat configuration containing:
+        """
+        default:
+            extensions:
+                FriendsOfBehat\SymfonyExtension:
+                    env_file: .env_in_memory
+                    kernel:
+                        path: src/MyKernel.php
+                        class: MyKernel
+        """
+        And a file ".env_in_memory" containing:
+        """
+        APP_ENV=dev
+        """
+        And a file "src/MyKernel.php" containing:
+        """
+        <?php
+
+        use Symfony\Component\HttpKernel\Kernel;
+        use Symfony\Component\Config\Loader\LoaderInterface;
+
+        class MyKernel extends Kernel
+        {
+            public function registerBundles() { return []; }
+            public function registerContainerConfiguration(LoaderInterface $loader) {}
+        }
+        """
+        And a feature file with passing scenario
+        When I run Behat
+        Then it should pass