diff --git a/tests/FrontControllerTest.php b/tests/FrontControllerTest.php
index ace68ea..20d74b3 100644
--- a/tests/FrontControllerTest.php
+++ b/tests/FrontControllerTest.php
@@ -17,6 +17,30 @@ use Slim\Http\Response;
  */
 class FrontControllerTest extends \PHPUnit_Framework_TestCase
 {
+    /**
+     * Slim dependency container
+     * @var Container
+     */
+    private $container;
+
+    /**
+     * Mock HTTP request
+     * @var Request
+     */
+    private $request;
+
+    /**
+     * Mock HTTP response
+     * @var Response
+     */
+    private $response;
+
+    /**
+     * FrontController instance used in tests
+     * @var FrontController
+     */
+    private $controller;
+
     /**
      * Prepare tests.
      */