fix(tests): Update service-mixin tests.

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

We should think about the role of a "Oauth result decorator" going forward and where it should live. For example, maybe our future Relier model would serve as an Oauth result decorator...