Cleanup tests a bit and add a functional test

Author: driesvints

composer.json

@@ -22,7 +22,8 @@
         "mockery/mockery": "0.9.*",
         "phpunit/phpunit": "~4.0",
         "phpspec/phpspec": "~2.1",
-        "codeclimate/php-test-reporter": "^0.1.2"
+        "codeclimate/php-test-reporter": "^0.1.2",
+        "doctrine/dbal": "^2.5"
     },
     "autoload": {
         "classmap": [