How to do Unit Testing of Meteor 1.5.x application?

I have an application with server logic which load data from somewhere outside, but sometimes it’s better to mocking data locally for economy of time. Mock data could be for example like: URL, pdf file, video. It’s better than waiting for loading data a lot of time. Especially then you develop UI React components, and just need fast results.

In an application I also use this package:

Packages from looks outdated.
How do you do unit testing of Meteor 1.5.x app?

I will appreciate it for help.