fix(tests): Update service-mixin tests.

![image](https://cloud.githubusercontent.com/assets/128755/3883293/c7035a02-219f-11e4-97df-d034e043b838.png)

![bmo](https://cloud.githubusercontent.com/assets/2365255/3895089/db53ecf0-224a-11e4-875f-16442c82f6c9.gif)