Django testing how to assert Redirect - django

Question

With the folliwing code I get this wrong result : nose.proxy.AssertionError: 302 != 200 : Couldn't retrieve redirection page '/mes_dossiers/': response code was 302 (expected 200)
what is wrong with my code ?
#test.py
from django.test import TestCase, RequestFactory, Client
from ..models import *
from ..views import *
from django.core.management import call_command
class Cas(TestCase):
def setUp(self):
call_command('loaddata', 'fixture_users.json', verbosity=1)
call_command('loaddata', 'xxxxx_tests_xxxx.yaml',
verbosity=1)
def test_dossier_duplicate(self) :
request = self.factory.get('/dossier/3/copier/', follow = True)
request.user = User.objects.get(id=3)
pk = 3
response = dossier_duplicate(request, pk)
response.client = Client()
self.assertRedirects(response,'/mes_dossiers/',status_code=302,
target_status_code=200)
#urls.py
urlpatterns = [
url(r'^dossier/(?P<pk>[0-9]+)/copier/$',views.dossier_duplicate),
]
#views.py
#login_required(login_url="/accounts/login/")
def dossier_duplicate(request, pk):
dossier = get_object_or_404(Dossier, pk=pk)
groupe = dossier.createdBy.groups.all()[0].name
if not in_group(request.user, groupe) :
return HttpResponseForbidden('Vous ne pouvez pas accéder à ce
dossier')
else :
#code to duplicate the "dossier" instance and child contents
#
#
return redirect('/mes_dossiers/')

Answer 1

I've found more examples there:
Django : Testing if the page has redirected to the desired url
https://docs.djangoproject.com/en/3.0/topics/testing/tools/#django.test.SimpleTestCase.assertRedirects
and this worked:
class Cas(TestCase):
def setUp(self):
call_command('loaddata', 'fixture_users.json', verbosity=1)
call_command('loaddata', 'xxx_tests_xxxx.yaml',
verbosity=1)
def test_dossier_duplicate(self) :
request = self.client.get('/dossier/3/copier/', follow = True)
request.user = User.objects.get(id=3)
pk = 3
response = dossier_duplicate(request, pk)
response.client = Client()
response.client.login(username='xxxx', password='xxxxx')
self.assertRedirects(response, '/mes_dossiers/', status_code=302,
target_status_code=200, fetch_redirect_response=True)

Answer 2

I reach this question via google and I have a similar issue with testing redirect.
But my Django is v2.2 and the accepted answer cites a v1.7 which is no longer supported
I then google some more and found this code block at https://docs.djangoproject.com/en/2.2/topics/testing/tools/#django.test.SimpleTestCase.settings
from django.test import TestCase
class LoginTestCase(TestCase):
def test_login(self):
# First check for the default behavior
response = self.client.get('/sekrit/')
self.assertRedirects(response, '/accounts/login/?next=/sekrit/')
I modified for my own use which works.
For the OP case, this is how I believe should work if the OP uses 2.2
def test_dossier_duplicate(self) :
response = self.client.get('/dossier/3/copier/')
self.assertRedirects(response, '/mes_dossiers/')
I am leaving this here. In case future readers have a similar question but have it for Django v2.2

Answer 3

To test redirects you should use the test client instead of RequestFactory.
The API for the RequestFactory is a slightly restricted subset of the
test client API:
It only has access to the HTTP methods get(), post(), put(), delete(),
head(), options(), and trace().
These methods accept all the same
arguments except for follows. Since this is just a factory for
producing requests, it’s up to you to handle the response.
https://docs.djangoproject.com/en/1.11/topics/testing/advanced/#the-request-factory
Try changing self.factory.get to self.client.get
response = self.client.get('/dossier/3/copier/', follow = True)