Why does coverage.py show 80% of the tested model code in a Django project without a single test?

Question

Django

There are no tests created in the project, I launch coverage run --source='.' manage.py testand get a picture on the screenshots below.
Does this mean that there is no need to test the code marked green in the report, since its work is provided by the framework mechanisms, and I just define the fields I need and cannot break anything? But then why is the PhoneNumberField field also marked tested on one of the screenshots, this mechanism is implemented by a third-party application and its correct operation is not guaranteed by Django? I apologize for the screenshots, but I don’t see a more visual way to present information.

Answer 1

You are shown covered with those lines that are executed when the module is imported. Class declaration and attribute class. That's where 80% comes from.