pickhardt/betty — pull request #88 by Ch0c0late (2014-05-16 15:07:54+00:00)
Title: Add OS executor unit test.

1) OS executor test suite.
![os_unit_test](https://cloud.githubusercontent.com/assets/4386285/2998533/bf3671f2-dd0b-11e3-9af2-b376c37f1a65.jpeg)