Add first tests

Tests are awesome.

Ready for a look-see, @gerbal.  Test my tests thusly (steps one and two are the testing part.  You can then use the Merge button to merge or do step 3):

![screen shot 2013-10-08 at 5 18 59 pm](https://f.cloud.github.com/assets/1702745/1293124/4a2e4e7e-305f-11e3-841f-1d9d6cc53446.jpg)