Create unit tests

[webknjaz]

• [x] Read about tests here
• [x] Also there's a good link about test's in django docs here
• [x] Create tests for models
• [x] Create tests for views
• [ ] Create new separate vagga container for linter (pre-commit) (postpone this till next task)
• [ ] New container only for tests (postpone this till next task)
• [ ] Integrate your app with Travis CI and run test at Travis' script

As an example you can use this, but try to do it by yourself :new_moon_with_face:

[serhii73]

https://developer.mozilla.org/ru/docs/Learn/Server-side/Django/Testing

[serhii73]

@webknjaz I think my tests is ready - https://github.com/kpi-web-guild/django-girls-blog-serhii73/tree/feature/create_unit_tests/blog/tests Now I will be read about vagga.