Add tests and mocks for backend

[Armour]

I'm submitting a

• Bug report
• Feature request
• Performance issue
• Regression (a behavior that used to work and stopped working in a new release)
• Documentation issue or request
• Other... Please describe:

Current behavior

No backend tests

Expected behavior

Add backend tests with mocks

What is the motivation / use case for changing the behavior?

Of course we need it. 😀

[Armour]

https://github.com/visionmedia/supertest