Spec refactoring

[ehannes]

Our specs are not the most pretty ones out there. They need some refactoring.

One goal with this gem is to make it as easy as possible to add new resources. Repositories, Models and Mappers does not include any logic at all. These classes does not need any testing. If we instead focus on testing Repository::Base, Model::Base and Mapper::Base then all we need to test for each new resource is the integration with Fortnox, that it really works. We should therefore:

• Add gem for test coverage (simplecov)

For the new base gem, see #149:

• 100% test coverage for Model::Base (and all helper classes)
• 100% test coverage for Mapper::Base (and all helper classes)
• 100% test coverage for Repository::Base (and all helper classes)

For this gem:

• Add pure integration specs (not unit specs)
• Drop model specs
• Drop mapper specs
• Drop repository specs

[d-Pixie]

We should put this on hold for a bit. #149 will change the spec landscape quite a bit and it might be better if we did the refactoring of the test suite after the split.

[d-Pixie]

Updated original comment to reflect the split of the specs between this gem and the new base gem.