Source: 📖 Test Driven Development with Python ch14 p242

Testing that a form is used in a view

We can test that a form is part of a view by using the testing client to make a GET request to the page in question, and then accessing the context attribute of the response.

For example, if we have this home page view:

# views.py
from my_app.forms import ItemForm


def home_page(request):
	return render(request, 'home.html', {'form': ItemForm()})

We have given an instance of ItemForm the name 'form' in our context dictionary, which we can access by using the .context attribute of our response object in our unit test:

# test_views.py
from django.test import TestCase

from my_app.forms import ItemForm


class HomePageTest(TestCase):
	
	def test_home_page_uses_item_form(self):
		response = self.client.get('/')		# Request home page
		self.assertIsInstance(response.context['form'], ItemForm)

We can use assertIsInstance to check that the 'form' key of the response's context dictionary maps to an instance of ItemForm.

See also:

• Testing forms