don't display debug information when running tests

**BEFORE**
![screen_shot_2013-08-14_at_12 14 44_am](https://f.cloud.github.com/assets/362783/958481/d47e8cc2-0465-11e3-801a-9a5808ec2466.png)


**AFTER**
![1 _zsh](https://f.cloud.github.com/assets/362783/958468/72bde370-0465-11e3-9966-8496be403cbf.png)