如何测试 Django CreateView 和 form_valid

Question

This maybe very basic but I still fail to understand how to test a Django CreateView which has a form_valid(self, form) method ?

Here's my code:

class NewPatientFormView(LoginRequiredMixin, CreateView):
    model = Patient
    fields = ['name', 'surname', 'phone', 'email', 'PESEL', 'age',
          'patient_agreement']

    def form_valid(self, form):
        self.object = form.save(commit=False)
        self.object.created_by_user = self.request.user
        self.object.save()
        return super().form_valid(form)`

I'm using pytest and I simply fail to understand how to test this one. I would be really grateful for a short example how this could be tested ... Thanks!

Answer 1

Here once again is the class you have:

class NewPatientFormView(LoginRequiredMixin, CreateView):
    model = Patient
    fields = ['name', 'surname', 'phone', 'email', 'PESEL', 'age',
      'patient_agreement']
    

    def form_valid(self, form):
        self.object = form.save(commit=False)
        self.object.created_by_user = self.request.user
        self.object.save()
        return super().form_valid(form)

We can test the form validation by using a Request Factory :

import pytest
from django.test import RequestFactory
from django.contrib.auth.models import User    

factory = RequestFactory()

@pytest.mark.django_db
def test_form_valid_on_create_view():
    # Arrange
    data = {
       'name': 'Billy',
       'surname': 'Masters',
       'phone': '123-358-2382',
       # other fields
    } 
  
    user = User.objects.create_user(
        username='jacob', email='jacob@…', password='top_secret')

    request = factory.post( '/[Path to new Patient Form]/', data=data)
    request.user = user
   
    # Act
    response = NewPatientFormView.as_view()(request) # this will submit the form and run the form_valid.  

    # Assert
    
    Assert True

    

Answer 2

I believe you'd have to create the post data and such in the setUp of your test.

class NewPatientFormTest(TestCase):

    def setUp(self):
        self.form_data = {
            'name': 'Billy',
            'surname': 'Masters',
            'phone': '123-358-2382',
            *...the rest of your form data...*
        }

In your setUp make sure the rest of your data is setup appropriately. Then use your test - probably something like this:

def test_new_patient_form_is_valid(self):
    form = NewPatientForm(data=self.form_data)
    self.assertTrue(form.is_valid())

Obviously this is super simplified - but should get you on in the right direction on getting this tested.