Adhere to Symfony2 for activating the wunit mink driver

Author: patrickdreyer

README.md

@@ -24,7 +24,6 @@ default:
       framework_script: ../../framework/yii.php
       config_script: ../config/test.php
       mink_driver: true
-      wunit: ~
 ```
 
 Installation

src/Behat/YiiExtension/Extension.php

@@ -57,7 +57,7 @@ public function load(array $config, ContainerBuilder $container)
         }
         $container->setParameter('behat.yii_extension.config_script', $config['config_script']);
 
-        if (isset($config['wunit'])) {
+        if ($config['mink_driver']) {
             if (!class_exists('Behat\\Mink\\Driver\\WUnitDriver')) {
                 throw new \RuntimeException(
                     'Install WUnitDriver in order to activate wunit session.'
@@ -75,6 +75,11 @@ public function load(array $config, ContainerBuilder $container)
      */
     public function getConfig(ArrayNodeDefinition $builder)
     {
+        $boolFilter = function ($v) {
+            $filtered = filter_var($v, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
+            return (null === $filtered) ? $v : $filtered;
+        };
+
         $builder->
             children()->
                 scalarNode('framework_script')->
@@ -83,8 +88,11 @@ public function getConfig(ArrayNodeDefinition $builder)
                 scalarNode('config_script')->
                     isRequired()->
                 end()->
-                arrayNode('wunit')->
-                    canBeUnset()->
+                booleanNode('mink_driver')->
+                    beforeNormalization()->
+                        ifString()->then($boolFilter)->
+                    end()->
+                    defaultFalse()->
                 end()->
             end()
         ;