Added simple tests for controller

Tests/Controller/BackendControllerTest.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * (c) Christian Gripp <mail@core23.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Core23\ShariffBundle\Tests\Controller;
+
+use Core23\ShariffBundle\Controller\BackendController;
+use PHPUnit\Framework\TestCase;
+
+class BackendControllerTest extends TestCase
+{
+    private $controller;
+
+    protected function setUp()
+    {
+        $this->controller = new BackendController();
+    }
+
+    public function testItIsInstantiable()
+    {
+        $this->assertNotNull($this->controller);
+    }
+}