Use ArrayUtils::merge to allow recursive merging.

Author: weierophinney

module/Application/test/Controller/IndexControllerTest.php

@@ -8,6 +8,7 @@
 namespace ApplicationTest\Controller;
 
 use Application\Controller\IndexController;
+use Zend\Stdlib\ArrayUtils;
 use Zend\Test\PHPUnit\Controller\AbstractHttpControllerTestCase;
 
 class IndexControllerTest extends AbstractHttpControllerTestCase
@@ -20,7 +21,7 @@ public function setUp()
         // etc.
         $configOverrides = [];
 
-        $this->setApplicationConfig(array_merge(
+        $this->setApplicationConfig(ArrayUtils::merge(
             include __DIR__ . '/../../../../config/application.config.php',
             $configOverrides
         ));