Intriduce first model tests
Setup offer model tests
Merge master
Add more model tests
Merge branch 'master' of github.com:clarat-org/clarat into introduce_tests
Merge branch 'master' of github.com:clarat-org/clarat into introduce_tests
Add more tests and refactor
Minor cleanup
Merge branch 'master' of github.com:clarat-org/clarat into introduce_tests
Merge pull request #20 from clarat-org/introduce_tests

Introduce tests