Django doesn't respond with a form validation error
when a UniqueConstraint is violated
during the save process of an InlineAdmin formset.
A pytest test function uses Django's test client to save a Pizza object with the same Topping object twice, leading to an IntegrityError:
python -m venv .venv
source .venv/bin/activate.sh
pip install -r requirements.txt
pytest Alternatively, use the admin and reproduce the steps manually:
python -m venv .venv
source .venv/bin/activate.sh
pip install -r requirements.txt
./manage.py migrate
./manage.py createsuperuser
./manage.py runserverUse the admin to create a new Topping object. Then go to the Pizza form and add the previously created topping twice in the inline admin formset. Hit 'save' and you should see an IntegrityError.