Create tests for the django app

[webknjaz]

• [ ] Learn some testing basics:
  • [x] Read about tests here (examples use Python 2.7 syntax)
  • [x] Also there's a good link about test's in django docs here
  • [ ] MDN: Testing a Django web application
• [ ] Implement tests:
  • [x] Add running tests as a separate job in Travis CI (python manage.py test)
  • [x] Create tests for models
  • [ ] Create tests for views

Check https://github.com/kpi-web-guild/django-girls-blog-DrEdi/tree/master/main/tests for inspiration on what you can test for.