Tests covering all models

[sarala]

I have created tests for all models which tests for existence of the models and computed values.

[mfenner]

I am ok with repositoryList instead of repositoryCount.

Going forward I would expand some of the tests.

LGTM

[sarala]

@mfenner, which ones would you like to see extended?

[mfenner]

@sarala nothing urgent, but some tests are more or less boilerplate code.

[sarala]

@mfenner, I mainly did two things:

1. tests for computed variables
2. test model exist (boilerplate code) where there are no computed variables. There is nothing else to test in those models. However, it had no impact on codeclimate coverage.

[mfenner]

One example would be the test for organization abilities. There are various user roles and various abilities.

[sarala]

I thought you do that in abilities unit tests rather than model.