Fully test the factorio-mod-api

[Builditluc]

This is linked to #79 and build upon #82.

It serves as a place to list all of the tests we have to add to the factorio-mod-api (@MForster I believe you should be able to change the content of this issue to add things to the list)

EDIT: we can directly create issues form the list below

Tests:

• [x] correctly get the full mod spec
• [ ] correctly login
• [ ] Handle missing internet connection
• [ ] #79