Added var unit test

![image](https://f.cloud.github.com/assets/810040/786976/07c983aa-eacd-11e2-80ee-cf8605118e45.png)

![image](https://f.cloud.github.com/assets/810040/786979/117ea3f8-eacd-11e2-9eb2-9c2ebf16f038.png)

Bonus: it tells you the variables missing the the file

![image](https://f.cloud.github.com/assets/810040/786982/1fca64ce-eacd-11e2-858a-8406b7b3962f.png)